1ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat/* dnsmasq is Copyright (c) 2000-2009 Simon Kelley 2ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 3ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat This program is free software; you can redistribute it and/or modify 4ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat it under the terms of the GNU General Public License as published by 5ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat the Free Software Foundation; version 2 dated June, 1991, or 6ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (at your option) version 3 dated 29 June, 2007. 7ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 8ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat This program is distributed in the hope that it will be useful, 9ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat but WITHOUT ANY WARRANTY; without even the implied warranty of 10ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat GNU General Public License for more details. 12ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 13ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat You should have received a copy of the GNU General Public License 14ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat along with this program. If not, see <http://www.gnu.org/licenses/>. 15ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat*/ 16ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 17ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#include "dnsmasq.h" 18ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 19ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstruct daemon *daemon; 20ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 21ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic char *compile_opts = 22ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef HAVE_IPV6 23ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-" 24ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 25ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"IPv6 " 26ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef HAVE_GETOPT_LONG 27ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-" 28ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 29ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"GNU-getopt " 30ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_BROKEN_RTC 31ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-RTC " 32ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 33ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef NO_FORK 34ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-MMU " 35ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 36ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef HAVE_DBUS 37ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-" 38ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 39ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"DBus " 40ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef LOCALEDIR 41ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-" 42ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 43ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"I18N " 44ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef HAVE_DHCP 45ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-" 46ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 47ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"DHCP " 48ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_DHCP) && !defined(HAVE_SCRIPT) 49ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-scripts " 50ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 51ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef HAVE_TFTP 52ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"no-" 53ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 54ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat"TFTP"; 55ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 56ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 57ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 58ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic volatile pid_t pid = 0; 59ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic volatile int pipewrite; 60ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 61ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic int set_dns_listeners(time_t now, fd_set *set, int *maxfdp); 62ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void check_dns_listeners(fd_set *set, time_t now); 63ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void sig_handler(int sig); 64ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void async_event(int pipe, time_t now); 65ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void fatal_event(struct event_desc *ev); 66ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void poll_resolv(void); 6733b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#ifdef __ANDROID__ 6833b344454b95ed99bad7d3fe4d493870923deaf6San Mehatstatic int set_android_listeners(fd_set *set, int *maxfdp); 6933b344454b95ed99bad7d3fe4d493870923deaf6San Mehatstatic int check_android_listeners(fd_set *set); 7033b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#endif 71ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 72ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatint main (int argc, char **argv) 73ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 74ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int bind_fallback = 0; 75ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat time_t now; 76ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct sigaction sigact; 77ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct iname *if_tmp; 78ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int piperead, pipefd[2], err_pipe[2]; 79ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct passwd *ent_pw = NULL; 80ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_DHCP) && defined(HAVE_SCRIPT) 81ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat uid_t script_uid = 0; 82ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat gid_t script_gid = 0; 83ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 84ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct group *gp = NULL; 85ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat long i, max_fd = sysconf(_SC_OPEN_MAX); 86ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat char *baduser = NULL; 87ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int log_err; 88ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_LINUX_NETWORK) 89ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat cap_user_header_t hdr = NULL; 90ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat cap_user_data_t data = NULL; 91ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 92ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 93ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef LOCALEDIR 94ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat setlocale(LC_ALL, ""); 95ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bindtextdomain("dnsmasq", LOCALEDIR); 96ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat textdomain("dnsmasq"); 97ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 98ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 99ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigact.sa_handler = sig_handler; 100ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigact.sa_flags = 0; 101ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigemptyset(&sigact.sa_mask); 102ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigaction(SIGUSR1, &sigact, NULL); 103ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigaction(SIGUSR2, &sigact, NULL); 104ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigaction(SIGHUP, &sigact, NULL); 105ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigaction(SIGTERM, &sigact, NULL); 106ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigaction(SIGALRM, &sigact, NULL); 107ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigaction(SIGCHLD, &sigact, NULL); 108ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 109ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* ignore SIGPIPE */ 110ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigact.sa_handler = SIG_IGN; 111ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat sigaction(SIGPIPE, &sigact, NULL); 112ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 113ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat umask(022); /* known umask, create leases and pid files as 0644 */ 114ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 115ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat read_opts(argc, argv, compile_opts); 116ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 117ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->edns_pktsz < PACKETSZ) 118ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->edns_pktsz = PACKETSZ; 119ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->packet_buff_sz = daemon->edns_pktsz > DNSMASQ_PACKETSZ ? 120ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->edns_pktsz : DNSMASQ_PACKETSZ; 121ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->packet = safe_malloc(daemon->packet_buff_sz); 122ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 123ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 124ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!daemon->lease_file) 125ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 126ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp) 127ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->lease_file = LEASEFILE; 128ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 129ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 130ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 131ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Close any file descriptors we inherited apart from std{in|out|err} */ 132ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (i = 0; i < max_fd; i++) 133ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (i != STDOUT_FILENO && i != STDERR_FILENO && i != STDIN_FILENO) 134ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(i); 135ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 136ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_LINUX_NETWORK 137ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat netlink_init(); 138ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#elif !(defined(IP_RECVDSTADDR) && \ 139ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat defined(IP_RECVIF) && \ 140ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat defined(IP_SENDSRCADDR)) 141ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(daemon->options & OPT_NOWILD)) 142ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 143ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bind_fallback = 1; 144ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->options |= OPT_NOWILD; 145ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 146ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 147ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 148ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef HAVE_TFTP 149ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_TFTP) 150ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("TFTP server not available: set HAVE_TFTP in src/config.h"), NULL, EC_BADCONF); 151ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 152ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 153ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_SOLARIS_NETWORK 154ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->max_logs != 0) 155ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("asychronous logging is not available under Solaris"), NULL, EC_BADCONF); 156ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 157ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 158ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat rand_init(); 159ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 160ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat now = dnsmasq_time(); 161ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 162ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 163ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp) 164ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 165ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Note that order matters here, we must call lease_init before 166ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat creating any file descriptors which shouldn't be leaked 167ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat to the lease-script init process. */ 168ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat lease_init(now); 169ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dhcp_init(); 170ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 171ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 172ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 173ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!enumerate_interfaces()) 174ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("failed to find list of interfaces: %s"), NULL, EC_MISC); 175ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 176ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_NOWILD) 177ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 178ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->listeners = create_bound_listeners(); 179ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 180ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next) 181ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (if_tmp->name && !if_tmp->used) 182ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("unknown interface %s"), if_tmp->name, EC_BADNET); 183ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 184ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (if_tmp = daemon->if_addrs; if_tmp; if_tmp = if_tmp->next) 185ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!if_tmp->used) 186ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 187ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat prettyprint_addr(&if_tmp->addr, daemon->namebuff); 188ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("no interface with address %s"), daemon->namebuff, EC_BADNET); 189ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 190ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 191ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if ((daemon->port != 0 || (daemon->options & OPT_TFTP)) && 192ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat !(daemon->listeners = create_wildcard_listeners())) 193ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("failed to create listening socket: %s"), NULL, EC_BADNET); 194ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 195ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0) 196ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat cache_init(); 197ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 198ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_DBUS) 199ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DBUS 200ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 201ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat char *err; 202ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->dbus = NULL; 203ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->watches = NULL; 204ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((err = dbus_init())) 205ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("DBus error: %s"), err, EC_MISC); 206ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 207ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#else 208ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("DBus not available: set HAVE_DBUS in src/config.h"), NULL, EC_BADCONF); 209ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 210ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 211ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0) 212ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat pre_allocate_sfds(); 213ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 214ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_DHCP) && defined(HAVE_SCRIPT) 215ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Note getpwnam returns static storage */ 216ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp && daemon->lease_change_command && daemon->scriptuser) 217ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 218ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((ent_pw = getpwnam(daemon->scriptuser))) 219ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 220ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat script_uid = ent_pw->pw_uid; 221ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat script_gid = ent_pw->pw_gid; 222ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 223ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 224ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat baduser = daemon->scriptuser; 225ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 226ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 227ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 228ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->username && !(ent_pw = getpwnam(daemon->username))) 229ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat baduser = daemon->username; 230ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (daemon->groupname && !(gp = getgrnam(daemon->groupname))) 231ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat baduser = daemon->groupname; 232ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 233ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (baduser) 234ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("unknown user or group: %s"), baduser, EC_BADCONF); 235ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 236ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* implement group defaults, "dip" if available, or group associated with uid */ 237ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!daemon->group_set && !gp) 238ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 239ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(gp = getgrnam(CHGRP)) && ent_pw) 240ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat gp = getgrgid(ent_pw->pw_gid); 241ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 242ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* for error message */ 243ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (gp) 244ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->groupname = gp->gr_name; 245ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 246ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 247ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_LINUX_NETWORK) 248ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* determine capability API version here, while we can still 249ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat call safe_malloc */ 250ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (ent_pw && ent_pw->pw_uid != 0) 251ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 252ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int capsize = 1; /* for header version 1 */ 253ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat hdr = safe_malloc(sizeof(*hdr)); 254ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 255ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* find version supported by kernel */ 256ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat memset(hdr, 0, sizeof(*hdr)); 257ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat capget(hdr, NULL); 258ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 259ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (hdr->version != LINUX_CAPABILITY_VERSION_1) 260ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 261ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* if unknown version, use largest supported version (3) */ 262ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (hdr->version != LINUX_CAPABILITY_VERSION_2) 263ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat hdr->version = LINUX_CAPABILITY_VERSION_3; 264ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat capsize = 2; 265ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 266ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 267ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat data = safe_malloc(sizeof(*data) * capsize); 268ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat memset(data, 0, sizeof(*data) * capsize); 269ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 270ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 271ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 272ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Use a pipe to carry signals and other events back to the event loop 273ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat in a race-free manner and another to carry errors to daemon-invoking process */ 274ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat safe_pipe(pipefd, 1); 275ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 276ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat piperead = pipefd[0]; 277ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat pipewrite = pipefd[1]; 278ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* prime the pipe to load stuff first time. */ 279ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(pipewrite, EVENT_RELOAD, 0); 280ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 281ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat err_pipe[1] = -1; 282ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 283ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(daemon->options & OPT_DEBUG)) 284ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 28533b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#ifndef __ANDROID__ 286ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int nullfd; 28733b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#endif 288ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 289ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* The following code "daemonizes" the process. 290ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat See Stevens section 12.4 */ 291ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 292ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (chdir("/") != 0) 293ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("cannot chdir to filesystem root: %s"), NULL, EC_MISC); 294ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 295ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef NO_FORK 296ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(daemon->options & OPT_NO_FORK)) 297ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 298ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat pid_t pid; 299ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 300ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* pipe to carry errors back to original process. 301ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat When startup is complete we close this and the process terminates. */ 302ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat safe_pipe(err_pipe, 0); 303ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 304ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((pid = fork()) == -1) 305ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* fd == -1 since we've not forked, never returns. */ 306ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(-1, EVENT_FORK_ERR, errno); 307ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 308ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (pid != 0) 309ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 310ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct event_desc ev; 311ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 312ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* close our copy of write-end */ 313ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(err_pipe[1]); 314ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 315ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* check for errors after the fork */ 316ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (read_write(err_pipe[0], (unsigned char *)&ev, sizeof(ev), 1)) 317ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fatal_event(&ev); 318ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 319ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(EC_GOOD); 320ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 321ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 322ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(err_pipe[0]); 323ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 324ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* NO calls to die() from here on. */ 325ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 326ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat setsid(); 327ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 328ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((pid = fork()) == -1) 329ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(err_pipe[1], EVENT_FORK_ERR, errno); 330ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 331ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (pid != 0) 332ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(0); 333ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 334ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 335ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 336ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* write pidfile _after_ forking ! */ 337ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->runfile) 338ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 339ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FILE *pidfile; 340ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 341ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* only complain if started as root */ 342ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((pidfile = fopen(daemon->runfile, "w"))) 343ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 344ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fprintf(pidfile, "%d\n", (int) getpid()); 345ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fclose(pidfile); 346ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 347ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (getuid() == 0) 348ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 349ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(err_pipe[1], EVENT_PIDFILE, errno); 350ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(0); 351ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 352ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 35333b344454b95ed99bad7d3fe4d493870923deaf6San Mehat 35433b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#ifndef __ANDROID__ 355ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* open stdout etc to /dev/null */ 356ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat nullfd = open("/dev/null", O_RDWR); 357ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dup2(nullfd, STDOUT_FILENO); 358ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dup2(nullfd, STDERR_FILENO); 359ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dup2(nullfd, STDIN_FILENO); 360ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(nullfd); 36133b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#endif 362ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 363ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 364ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat log_err = log_start(ent_pw, err_pipe[1]); 365ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 366ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* if we are to run scripts, we need to fork a helper before dropping root. */ 367ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->helperfd = -1; 368ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_DHCP) && defined(HAVE_SCRIPT) 369ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp && daemon->lease_change_command) 370ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->helperfd = create_helper(pipewrite, err_pipe[1], script_uid, script_gid, max_fd); 371ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 372ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 373ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(daemon->options & OPT_DEBUG) && getuid() == 0) 374ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 375ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int bad_capabilities = 0; 376ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat gid_t dummy; 377ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 378ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* remove all supplimentary groups */ 379ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (gp && 380ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (setgroups(0, &dummy) == -1 || 381ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat setgid(gp->gr_gid) == -1)) 382ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 383ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(err_pipe[1], EVENT_GROUP_ERR, errno); 384ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(0); 385ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 386ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 387ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (ent_pw && ent_pw->pw_uid != 0) 388ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 389ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_LINUX_NETWORK) 390ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* On linux, we keep CAP_NETADMIN (for ARP-injection) and 391ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat CAP_NET_RAW (for icmp) if we're doing dhcp */ 392ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat data->effective = data->permitted = data->inheritable = 39341cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt#ifdef __ANDROID__ 39441cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt (1 << CAP_NET_BIND_SERVICE) | 39541cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt#endif 396ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW) | (1 << CAP_SETUID); 397ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 398ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Tell kernel to not clear capabilities when dropping root */ 3995658bcb797978c3472335d93554405aba8236f66San Mehat if (capset(hdr, data) == -1 || prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) 400ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bad_capabilities = errno; 401ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 402ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#elif defined(HAVE_SOLARIS_NETWORK) 403ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* http://developers.sun.com/solaris/articles/program_privileges.html */ 404ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat priv_set_t *priv_set; 405ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 406ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(priv_set = priv_str_to_set("basic", ",", NULL)) || 407ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat priv_addset(priv_set, PRIV_NET_ICMPACCESS) == -1 || 408ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat priv_addset(priv_set, PRIV_SYS_NET_CONFIG) == -1) 409ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bad_capabilities = errno; 410ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 411ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (priv_set && bad_capabilities == 0) 412ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 413ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat priv_inverse(priv_set); 414ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 415ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (setppriv(PRIV_OFF, PRIV_LIMIT, priv_set) == -1) 416ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bad_capabilities = errno; 417ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 418ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 419ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (priv_set) 420ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat priv_freeset(priv_set); 421ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 422ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 423ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 424ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (bad_capabilities != 0) 425ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 426ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(err_pipe[1], EVENT_CAP_ERR, bad_capabilities); 427ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(0); 428ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 429ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 430ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* finally drop root */ 431ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (setuid(ent_pw->pw_uid) == -1) 432ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 433ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(err_pipe[1], EVENT_USER_ERR, errno); 434ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(0); 435ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 436ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 437ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_LINUX_NETWORK 438ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat data->effective = data->permitted = 43941cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt#ifdef __ANDROID__ 44041cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt (1 << CAP_NET_BIND_SERVICE) | 44141cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt#endif 442ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW); 443ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat data->inheritable = 0; 444ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 445ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* lose the setuid and setgid capbilities */ 446ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (capset(hdr, data) == -1) 447ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 448ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(err_pipe[1], EVENT_CAP_ERR, errno); 449ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(0); 450ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 451ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 452ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 453ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 454ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 455ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 456ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_LINUX_NETWORK 457ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_DEBUG) 4585658bcb797978c3472335d93554405aba8236f66San Mehat prctl(PR_SET_DUMPABLE, 1, 0, 0, 0); 459ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 460ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 461ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port == 0) 462ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("started, version %s DNS disabled"), VERSION); 463ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (daemon->cachesize != 0) 464ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("started, version %s cachesize %d"), VERSION, daemon->cachesize); 465ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 466ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("started, version %s cache disabled"), VERSION); 467ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 468ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("compile time options: %s"), compile_opts); 469ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 470ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DBUS 471ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_DBUS) 472ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 473ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dbus) 474ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("DBus support enabled: connected to system bus")); 475ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 476ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("DBus support enabled: bus connection pending")); 477ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 478ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 479ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 480ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (log_err != 0) 481ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("warning: failed to change owner of %s: %s"), 482ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->log_file, strerror(log_err)); 483ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 484ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (bind_fallback) 485ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("setting --bind-interfaces option because of OS limitations")); 486ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 487ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(daemon->options & OPT_NOWILD)) 488ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next) 489ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (if_tmp->name && !if_tmp->used) 490ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("warning: interface %s does not currently exist"), if_tmp->name); 491ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 492ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0 && (daemon->options & OPT_NO_RESOLV)) 493ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 494ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->resolv_files && !daemon->resolv_files->is_default) 495ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("warning: ignoring resolv-file flag because no-resolv is set")); 496ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->resolv_files = NULL; 497ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!daemon->servers) 498ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("warning: no upstream servers configured")); 499ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 500ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 501ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->max_logs != 0) 502ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("asynchronous logging enabled, queue limit is %d messages"), daemon->max_logs); 503ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 504ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 505ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp) 506ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 507ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct dhcp_context *dhcp_tmp; 508ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 509ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (dhcp_tmp = daemon->dhcp; dhcp_tmp; dhcp_tmp = dhcp_tmp->next) 510ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 511ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat prettyprint_time(daemon->dhcp_buff2, dhcp_tmp->lease_time); 512ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat strcpy(daemon->dhcp_buff, inet_ntoa(dhcp_tmp->start)); 513ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(MS_DHCP | LOG_INFO, 514ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (dhcp_tmp->flags & CONTEXT_STATIC) ? 515ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _("DHCP, static leases only on %.0s%s, lease time %s") : 516ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (dhcp_tmp->flags & CONTEXT_PROXY) ? 517ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _("DHCP, proxy on subnet %.0s%s%.0s") : 518ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _("DHCP, IP range %s -- %s, lease time %s"), 519ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->dhcp_buff, inet_ntoa(dhcp_tmp->end), daemon->dhcp_buff2); 520ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 521ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 522ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 523ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 524ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_TFTP 525ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_TFTP) 526ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 527ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef FD_SETSIZE 528ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (FD_SETSIZE < (unsigned)max_fd) 529ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat max_fd = FD_SETSIZE; 530ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 531ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 532ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(MS_TFTP | LOG_INFO, "TFTP %s%s %s", 533ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->tftp_prefix ? _("root is ") : _("enabled"), 534ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->tftp_prefix ? daemon->tftp_prefix: "", 535ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->options & OPT_TFTP_SECURE ? _("secure mode") : ""); 536ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 537ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* This is a guess, it assumes that for small limits, 538ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat disjoint files might be served, but for large limits, 539ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat a single file will be sent to may clients (the file only needs 540ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat one fd). */ 541ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 542ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat max_fd -= 30; /* use other than TFTP */ 543ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 544ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (max_fd < 0) 545ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat max_fd = 5; 546ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (max_fd < 100) 547ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat max_fd = max_fd/2; 548ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 549ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat max_fd = max_fd - 20; 550ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 551ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* if we have to use a limited range of ports, 552ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat that will limit the number of transfers */ 553ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->start_tftp_port != 0 && 554ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->end_tftp_port - daemon->start_tftp_port + 1 < max_fd) 555ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat max_fd = daemon->end_tftp_port - daemon->start_tftp_port + 1; 556ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 557ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->tftp_max > max_fd) 558ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 559ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->tftp_max = max_fd; 560ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(MS_TFTP | LOG_WARNING, 561ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _("restricting maximum simultaneous TFTP transfers to %d"), 562ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->tftp_max); 563ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 564ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 565ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 566ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 567ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* finished start-up - release original process */ 568ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (err_pipe[1] != -1) 569ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(err_pipe[1]); 570ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 571ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0) 572ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_servers(); 573ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 574ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat pid = getpid(); 575ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 576ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat while (1) 577ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 578ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int maxfd = -1; 579ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct timeval t, *tp = NULL; 580ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fd_set rset, wset, eset; 581ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 582ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ZERO(&rset); 583ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ZERO(&wset); 584ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ZERO(&eset); 585ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 586ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* if we are out of resources, find how long we have to wait 587ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for some to come free, we'll loop around then and restart 588ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat listening for queries */ 589ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((t.tv_sec = set_dns_listeners(now, &rset, &maxfd)) != 0) 590ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 591ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat t.tv_usec = 0; 592ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat tp = &t; 593ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 59433b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#ifdef __ANDROID__ 59533b344454b95ed99bad7d3fe4d493870923deaf6San Mehat set_android_listeners(&rset, &maxfd); 59633b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#endif 597ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 598ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Whilst polling for the dbus, or doing a tftp transfer, wake every quarter second */ 599ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->tftp_trans || 600ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat ((daemon->options & OPT_DBUS) && !daemon->dbus)) 601ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 602ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat t.tv_sec = 0; 603ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat t.tv_usec = 250000; 604ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat tp = &t; 605ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 606ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 607ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DBUS 608ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat set_dbus_listeners(&maxfd, &rset, &wset, &eset); 609ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 610ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 611ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 612ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp) 613ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 614ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(daemon->dhcpfd, &rset); 615ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(daemon->dhcpfd, &maxfd); 616ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 617ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 618ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 619ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_LINUX_NETWORK 620ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(daemon->netlinkfd, &rset); 621ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(daemon->netlinkfd, &maxfd); 622ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 623ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 624ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(piperead, &rset); 625ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(piperead, &maxfd); 626ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 627ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 628ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat# ifdef HAVE_SCRIPT 629ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat while (helper_buf_empty() && do_script_run(now)); 630ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 631ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!helper_buf_empty()) 632ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 633ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(daemon->helperfd, &wset); 634ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(daemon->helperfd, &maxfd); 635ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 636ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat# else 637ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* need this for other side-effects */ 638ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat while (do_script_run(now)); 639ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat# endif 640ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 641ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 642ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* must do this just before select(), when we know no 643ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat more calls to my_syslog() can occur */ 644ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat set_log_writer(&wset, &maxfd); 645ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 646ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (select(maxfd+1, &rset, &wset, &eset, tp) < 0) 647ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 648ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* otherwise undefined after error */ 649ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ZERO(&rset); FD_ZERO(&wset); FD_ZERO(&eset); 650ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 651ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 652ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat now = dnsmasq_time(); 653ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 654ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_log_writer(&wset); 655ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 656ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Check for changes to resolv files once per second max. */ 657ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Don't go silent for long periods if the clock goes backwards. */ 658ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->last_resolv == 0 || 659ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat difftime(now, daemon->last_resolv) > 1.0 || 660ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat difftime(now, daemon->last_resolv) < -1.0) 661ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 662ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->last_resolv = now; 663ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 664ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0 && !(daemon->options & OPT_NO_POLL)) 665ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat poll_resolv(); 666ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 667ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 668ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (FD_ISSET(piperead, &rset)) 669ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat async_event(piperead, now); 670ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 671ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_LINUX_NETWORK 672ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (FD_ISSET(daemon->netlinkfd, &rset)) 673ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat netlink_multicast(); 674ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 675ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 676ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DBUS 677ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* if we didn't create a DBus connection, retry now. */ 678ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((daemon->options & OPT_DBUS) && !daemon->dbus) 679ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 680ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat char *err; 681ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((err = dbus_init())) 682ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("DBus error: %s"), err); 683ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dbus) 684ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("connected to system DBus")); 685ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 686ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_dbus_listeners(&rset, &wset, &eset); 687ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 68833b344454b95ed99bad7d3fe4d493870923deaf6San Mehat 68933b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#ifdef __ANDROID__ 69033b344454b95ed99bad7d3fe4d493870923deaf6San Mehat check_android_listeners(&rset); 69133b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#endif 692ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 693ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_dns_listeners(&rset, now); 694ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 695ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_TFTP 696ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_tftp_listeners(&rset, now); 697ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 698ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 699ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 700ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp && FD_ISSET(daemon->dhcpfd, &rset)) 701ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dhcp_packet(now); 702ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 703ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat# ifdef HAVE_SCRIPT 704ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->helperfd != -1 && FD_ISSET(daemon->helperfd, &wset)) 705ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat helper_write(); 706ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat# endif 707ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 708ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 709ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 710ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 711ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 712ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void sig_handler(int sig) 713ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 714ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (pid == 0) 715ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 716ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* ignore anything other than TERM during startup 717ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat and in helper proc. (helper ignore TERM too) */ 718ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (sig == SIGTERM) 719ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat exit(EC_MISC); 720ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 721ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (pid != getpid()) 722ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 723ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* alarm is used to kill TCP children after a fixed time. */ 724ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (sig == SIGALRM) 725ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(0); 726ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 727ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 728ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 729ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* master process */ 730ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int event, errsave = errno; 731ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 732ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (sig == SIGHUP) 733ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat event = EVENT_RELOAD; 734ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (sig == SIGCHLD) 735ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat event = EVENT_CHILD; 736ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (sig == SIGALRM) 737ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat event = EVENT_ALARM; 738ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (sig == SIGTERM) 739ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat event = EVENT_TERM; 740ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (sig == SIGUSR1) 741ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat event = EVENT_DUMP; 742ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (sig == SIGUSR2) 743ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat event = EVENT_REOPEN; 744ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 745ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat return; 746ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 747ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat send_event(pipewrite, event, 0); 748ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat errno = errsave; 749ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 750ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 751ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 752ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatvoid send_event(int fd, int event, int data) 753ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 754ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct event_desc ev; 755ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 756ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat ev.event = event; 757ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat ev.data = data; 758ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 759ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* error pipe, debug mode. */ 760ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (fd == -1) 761ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fatal_event(&ev); 762ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 763ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* pipe is non-blocking and struct event_desc is smaller than 764ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat PIPE_BUF, so this either fails or writes everything */ 765ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat while (write(fd, &ev, sizeof(ev)) == -1 && errno == EINTR); 766ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 767ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 768ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void fatal_event(struct event_desc *ev) 769ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 770ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat errno = ev->data; 771ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 772ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat switch (ev->event) 773ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 774ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_DIE: 775ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat exit(0); 776ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 777ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_FORK_ERR: 778ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("cannot fork into background: %s"), NULL, EC_MISC); 779ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 780ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_PIPE_ERR: 781ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("failed to create helper: %s"), NULL, EC_MISC); 782ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 783ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_CAP_ERR: 784ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("setting capabilities failed: %s"), NULL, EC_MISC); 785ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 786ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_USER_ERR: 787ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_HUSER_ERR: 788ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("failed to change user-id to %s: %s"), 789ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat ev->event == EVENT_USER_ERR ? daemon->username : daemon->scriptuser, 790ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat EC_MISC); 791ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 792ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_GROUP_ERR: 793ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("failed to change group-id to %s: %s"), daemon->groupname, EC_MISC); 794ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 795ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_PIDFILE: 796ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("failed to open pidfile %s: %s"), daemon->runfile, EC_FILE); 797ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 798ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_LOG_ERR: 799ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat die(_("cannot open %s: %s"), daemon->log_file ? daemon->log_file : "log", EC_FILE); 800ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 801ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 802ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 803ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void async_event(int pipe, time_t now) 804ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 805ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat pid_t p; 806ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct event_desc ev; 807ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int i; 808ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 809ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (read_write(pipe, (unsigned char *)&ev, sizeof(ev), 1)) 810ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat switch (ev.event) 811ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 812ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_RELOAD: 813ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat clear_cache_and_reload(now); 814ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0 && daemon->resolv_files && (daemon->options & OPT_NO_POLL)) 815ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 816ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat reload_servers(daemon->resolv_files->name); 817ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_servers(); 818ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 819ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 820ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat rerun_scripts(); 821ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 822ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 823ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 824ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_DUMP: 825ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0) 826ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dump_cache(now); 827ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 828ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 829ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_ALARM: 830ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 831ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp) 832ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 833ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat lease_prune(NULL, now); 834ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat lease_update_file(now); 835ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 836ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 837ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 838ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 839ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_CHILD: 840ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* See Stevens 5.10 */ 841ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat while ((p = waitpid(-1, NULL, WNOHANG)) != 0) 842ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (p == -1) 843ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 844ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (errno != EINTR) 845ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 846ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 847ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 848ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (i = 0 ; i < MAX_PROCS; i++) 849ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->tcp_pids[i] == p) 850ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->tcp_pids[i] = 0; 851ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 852ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 853ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_KILLED: 854ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("child process killed by signal %d"), ev.data); 855ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 856ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 857ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_EXITED: 858ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("child process exited with status %d"), ev.data); 859ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 860ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 861ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_EXEC_ERR: 862ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_ERR, _("failed to execute %s: %s"), 863ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->lease_change_command, strerror(ev.data)); 864ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 865ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 866ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* necessary for fatal errors in helper */ 867ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_HUSER_ERR: 868ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_DIE: 869ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fatal_event(&ev); 870ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 871ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 872ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_REOPEN: 873ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Note: this may leave TCP-handling processes with the old file still open. 874ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat Since any such process will die in CHILD_LIFETIME or probably much sooner, 875ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat we leave them logging to the old file. */ 876ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->log_file != NULL) 877ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat log_reopen(daemon->log_file); 878ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 879ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 880ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat case EVENT_TERM: 881ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Knock all our children on the head. */ 882ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (i = 0; i < MAX_PROCS; i++) 883ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->tcp_pids[i] != 0) 884ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat kill(daemon->tcp_pids[i], SIGALRM); 885ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 886ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_DHCP) && defined(HAVE_SCRIPT) 887ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* handle pending lease transitions */ 888ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->helperfd != -1) 889ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 890ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* block in writes until all done */ 891ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((i = fcntl(daemon->helperfd, F_GETFL)) != -1) 892ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fcntl(daemon->helperfd, F_SETFL, i & ~O_NONBLOCK); 893ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat do { 894ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat helper_write(); 895ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } while (!helper_buf_empty() || do_script_run(now)); 896ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(daemon->helperfd); 897ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 898ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 899ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 900ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->lease_stream) 901ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fclose(daemon->lease_stream); 902ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 903ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->runfile) 904ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat unlink(daemon->runfile); 905ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 906ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("exiting on receipt of SIGTERM")); 907ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat flush_log(); 908ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat exit(EC_GOOD); 909ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 910ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 911ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 912ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void poll_resolv() 913ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 914ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct resolvc *res, *latest; 915ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct stat statbuf; 916ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat time_t last_change = 0; 917ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* There may be more than one possible file. 918ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat Go through and find the one which changed _last_. 919ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat Warn of any which can't be read. */ 920ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (latest = NULL, res = daemon->resolv_files; res; res = res->next) 921ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (stat(res->name, &statbuf) == -1) 922ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 923ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!res->logged) 924ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("failed to access %s: %s"), res->name, strerror(errno)); 925ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat res->logged = 1; 926ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 927ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 928ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 929ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat res->logged = 0; 930ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (statbuf.st_mtime != res->mtime) 931ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 932ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat res->mtime = statbuf.st_mtime; 933ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (difftime(statbuf.st_mtime, last_change) > 0.0) 934ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 935ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat last_change = statbuf.st_mtime; 936ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat latest = res; 937ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 938ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 939ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 940ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 941ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (latest) 942ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 943ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat static int warned = 0; 944ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (reload_servers(latest->name)) 945ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 946ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_INFO, _("reading %s"), latest->name); 947ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat warned = 0; 948ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_servers(); 949ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_RELOAD) 950ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat cache_reload(); 951ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 952ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 953ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 954ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat latest->mtime = 0; 955ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!warned) 956ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 957ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat my_syslog(LOG_WARNING, _("no servers found in %s, will retry"), latest->name); 958ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat warned = 1; 959ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 960ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 961ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 962ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 963ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 964ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatvoid clear_cache_and_reload(time_t now) 965ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 966ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0) 967ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat cache_reload(); 968ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 969ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 970ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->dhcp) 971ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 972ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_ETHERS) 973ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dhcp_read_ethers(); 974ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat reread_dhcp(); 975ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dhcp_update_configs(daemon->dhcp_conf); 976ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_dhcp_hosts(0); 977ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat lease_update_from_configs(); 978ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat lease_update_file(now); 979ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat lease_update_dns(); 980ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 981ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 982ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 983ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 98433b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#ifdef __ANDROID__ 98533b344454b95ed99bad7d3fe4d493870923deaf6San Mehat 98633b344454b95ed99bad7d3fe4d493870923deaf6San Mehatstatic int set_android_listeners(fd_set *set, int *maxfdp) { 98733b344454b95ed99bad7d3fe4d493870923deaf6San Mehat FD_SET(STDIN_FILENO, set); 98833b344454b95ed99bad7d3fe4d493870923deaf6San Mehat bump_maxfd(STDIN_FILENO, maxfdp); 98933b344454b95ed99bad7d3fe4d493870923deaf6San Mehat return 0; 99033b344454b95ed99bad7d3fe4d493870923deaf6San Mehat} 99133b344454b95ed99bad7d3fe4d493870923deaf6San Mehat 99233b344454b95ed99bad7d3fe4d493870923deaf6San Mehatstatic int check_android_listeners(fd_set *set) { 99300b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux int retcode = 0; 99433b344454b95ed99bad7d3fe4d493870923deaf6San Mehat if (FD_ISSET(STDIN_FILENO, set)) { 99533b344454b95ed99bad7d3fe4d493870923deaf6San Mehat char buffer[1024]; 99633b344454b95ed99bad7d3fe4d493870923deaf6San Mehat int rc; 99700b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux int consumed = 0; 99833b344454b95ed99bad7d3fe4d493870923deaf6San Mehat 99933b344454b95ed99bad7d3fe4d493870923deaf6San Mehat if ((rc = read(STDIN_FILENO, buffer, sizeof(buffer) -1)) < 0) { 100033b344454b95ed99bad7d3fe4d493870923deaf6San Mehat my_syslog(LOG_ERR, _("Error reading from stdin (%s)"), strerror(errno)); 100133b344454b95ed99bad7d3fe4d493870923deaf6San Mehat return -1; 100233b344454b95ed99bad7d3fe4d493870923deaf6San Mehat } 100333b344454b95ed99bad7d3fe4d493870923deaf6San Mehat buffer[rc] = '\0'; 100400b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux while(consumed < rc) { 100500b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux char *cmd; 100600b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux char *current_cmd = &buffer[consumed]; 100700b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux char *params = current_cmd; 100800b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux int len = strlen(current_cmd); 100900b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux 101000b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux cmd = strsep(¶ms, ":"); 101100b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux if (!strcmp(cmd, "update_dns")) { 101200b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux if (params != NULL) { 101300b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux set_servers(params); 101400b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux check_servers(); 101500b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux } else { 101600b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux my_syslog(LOG_ERR, _("Malformatted msg '%s'"), current_cmd); 101700b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux retcode = -1; 101800b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux } 101941cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt } else if (!strcmp(cmd, "update_ifaces")) { 102041cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt if (params != NULL) { 102141cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt set_interfaces(params); 102241cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt } else { 102341cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt my_syslog(LOG_ERR, _("Malformatted msg '%s'"), current_cmd); 102441cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt retcode = -1; 102541cd7ed80eb5e97ef9893633d05f0877da7d6d0cRobert Greenwalt } 102600b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux } else { 102700b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux my_syslog(LOG_ERR, _("Unknown cmd '%s'"), cmd); 102800b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux retcode = -1; 102900b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux } 103000b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux consumed += len + 1; 103133b344454b95ed99bad7d3fe4d493870923deaf6San Mehat } 103233b344454b95ed99bad7d3fe4d493870923deaf6San Mehat } 103300b7b3528890a27c04b2a6da87b790151cea8721Pierre Crépieux return retcode; 103433b344454b95ed99bad7d3fe4d493870923deaf6San Mehat} 103533b344454b95ed99bad7d3fe4d493870923deaf6San Mehat#endif 103633b344454b95ed99bad7d3fe4d493870923deaf6San Mehat 1037ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic int set_dns_listeners(time_t now, fd_set *set, int *maxfdp) 1038ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 1039ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct serverfd *serverfdp; 1040ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct listener *listener; 1041ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int wait = 0, i; 1042ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1043ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_TFTP 1044ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int tftp = 0; 1045ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct tftp_transfer *transfer; 1046ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (transfer = daemon->tftp_trans; transfer; transfer = transfer->next) 1047ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1048ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat tftp++; 1049ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(transfer->sockfd, set); 1050ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(transfer->sockfd, maxfdp); 1051ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1052ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1053ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1054ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* will we be able to get memory? */ 1055ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0) 1056ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat get_new_frec(now, &wait); 1057ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1058ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next) 1059ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1060ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(serverfdp->fd, set); 1061ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(serverfdp->fd, maxfdp); 1062ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1063ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1064ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0 && !daemon->osport) 1065ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (i = 0; i < RANDOM_SOCKS; i++) 1066ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->randomsocks[i].refcount != 0) 1067ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1068ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(daemon->randomsocks[i].fd, set); 1069ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(daemon->randomsocks[i].fd, maxfdp); 1070ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1071ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1072ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (listener = daemon->listeners; listener; listener = listener->next) 1073ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1074ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* only listen for queries if we have resources */ 1075ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (listener->fd != -1 && wait == 0) 1076ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1077ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(listener->fd, set); 1078ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(listener->fd, maxfdp); 1079ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1080ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1081ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* death of a child goes through the select loop, so 1082ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat we don't need to explicitly arrange to wake up here */ 1083ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (listener->tcpfd != -1) 1084ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (i = 0; i < MAX_PROCS; i++) 1085ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->tcp_pids[i] == 0) 1086ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1087ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(listener->tcpfd, set); 1088ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(listener->tcpfd, maxfdp); 1089ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 1090ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1091ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1092ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_TFTP 1093ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (tftp <= daemon->tftp_max && listener->tftpfd != -1) 1094ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1095ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(listener->tftpfd, set); 1096ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat bump_maxfd(listener->tftpfd, maxfdp); 1097ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1098ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1099ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1100ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1101ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1102ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat return wait; 1103ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 1104ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1105ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatstatic void check_dns_listeners(fd_set *set, time_t now) 1106ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 1107ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct serverfd *serverfdp; 1108ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct listener *listener; 1109ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int i; 1110ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1111ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next) 1112ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (FD_ISSET(serverfdp->fd, set)) 1113ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat reply_query(serverfdp->fd, serverfdp->source_addr.sa.sa_family, now); 1114ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1115ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->port != 0 && !daemon->osport) 1116ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (i = 0; i < RANDOM_SOCKS; i++) 1117ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->randomsocks[i].refcount != 0 && 1118ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ISSET(daemon->randomsocks[i].fd, set)) 1119ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat reply_query(daemon->randomsocks[i].fd, daemon->randomsocks[i].family, now); 1120ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1121ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (listener = daemon->listeners; listener; listener = listener->next) 1122ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1123ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (listener->fd != -1 && FD_ISSET(listener->fd, set)) 1124ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat receive_query(listener, now); 1125ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1126ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_TFTP 1127ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (listener->tftpfd != -1 && FD_ISSET(listener->tftpfd, set)) 1128ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat tftp_request(listener, now); 1129ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1130ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1131ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (listener->tcpfd != -1 && FD_ISSET(listener->tcpfd, set)) 1132ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1133ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int confd; 1134ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct irec *iface = NULL; 1135ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat pid_t p; 1136ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1137ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat while((confd = accept(listener->tcpfd, NULL, NULL)) == -1 && errno == EINTR); 1138ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1139ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (confd == -1) 1140ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat continue; 1141ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1142ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->options & OPT_NOWILD) 1143ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat iface = listener->iface; 1144ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 1145ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1146ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat union mysockaddr tcp_addr; 1147ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat socklen_t tcp_len = sizeof(union mysockaddr); 1148ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Check for allowed interfaces when binding the wildcard address: 1149ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat we do this by looking for an interface with the same address as 1150ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat the local address of the TCP connection, then looking to see if that's 1151ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat an allowed interface. As a side effect, we get the netmask of the 1152ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat interface too, for localisation. */ 1153ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1154ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* interface may be new since startup */ 1155ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (enumerate_interfaces() && 1156ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat getsockname(confd, (struct sockaddr *)&tcp_addr, &tcp_len) != -1) 1157ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (iface = daemon->interfaces; iface; iface = iface->next) 1158ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (sockaddr_isequal(&iface->addr, &tcp_addr)) 1159ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 1160ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1161ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1162ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!iface) 1163ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1164ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat shutdown(confd, SHUT_RDWR); 1165ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(confd); 1166ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1167ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef NO_FORK 1168ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else if (!(daemon->options & OPT_DEBUG) && (p = fork()) != 0) 1169ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1170ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (p != -1) 1171ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1172ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int i; 1173ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (i = 0; i < MAX_PROCS; i++) 1174ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (daemon->tcp_pids[i] == 0) 1175ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1176ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat daemon->tcp_pids[i] = p; 1177ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 1178ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1179ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1180ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(confd); 1181ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1182ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1183ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat else 1184ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1185ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat unsigned char *buff; 1186ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct server *s; 1187ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int flags; 1188ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct in_addr dst_addr_4; 1189ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1190ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dst_addr_4.s_addr = 0; 1191ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1192ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Arrange for SIGALARM after CHILD_LIFETIME seconds to 1193ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat terminate the process. */ 1194ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(daemon->options & OPT_DEBUG)) 1195ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat alarm(CHILD_LIFETIME); 1196ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1197ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* start with no upstream connections. */ 1198ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (s = daemon->servers; s; s = s->next) 1199ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat s->tcpfd = -1; 1200ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1201ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* The connected socket inherits non-blocking 1202ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat attribute from the listening socket. 1203ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat Reset that here. */ 1204ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((flags = fcntl(confd, F_GETFL, 0)) != -1) 1205ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fcntl(confd, F_SETFL, flags & ~O_NONBLOCK); 1206ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1207ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (listener->family == AF_INET) 1208ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat dst_addr_4 = iface->addr.in.sin_addr; 1209ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1210ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat buff = tcp_request(confd, now, dst_addr_4, iface->netmask); 1211ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1212ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat shutdown(confd, SHUT_RDWR); 1213ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(confd); 1214ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1215ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (buff) 1216ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat free(buff); 1217ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1218ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (s = daemon->servers; s; s = s->next) 1219ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (s->tcpfd != -1) 1220ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1221ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat shutdown(s->tcpfd, SHUT_RDWR); 1222ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(s->tcpfd); 1223ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1224ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifndef NO_FORK 1225ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!(daemon->options & OPT_DEBUG)) 1226ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1227ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat flush_log(); 1228ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat _exit(0); 1229ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1230ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1231ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1232ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1233ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1234ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 1235ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1236ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_DHCP 1237ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatint make_icmp_sock(void) 1238ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 1239ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int fd; 1240ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int zeroopt = 0; 1241ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1242ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP)) != -1) 1243ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1244ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (!fix_fd(fd) || 1245ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat setsockopt(fd, SOL_SOCKET, SO_DONTROUTE, &zeroopt, sizeof(zeroopt)) == -1) 1246ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1247ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(fd); 1248ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fd = -1; 1249ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1250ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1251ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1252ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat return fd; 1253ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 1254ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1255ffd68729961f7383f2e35494a03ccdef20f86c98San Mehatint icmp_ping(struct in_addr addr) 1256ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat{ 1257ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Try and get an ICMP echo from a machine. */ 1258ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1259ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat /* Note that whilst in the three second wait, we check for 1260ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (and service) events on the DNS and TFTP sockets, (so doing that 1261ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat better not use any resources our caller has in use...) 1262ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat but we remain deaf to signals or further DHCP packets. */ 1263ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1264ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int fd; 1265ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct sockaddr_in saddr; 1266ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct { 1267ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct ip ip; 1268ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct icmp icmp; 1269ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } packet; 1270ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat unsigned short id = rand16(); 1271ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat unsigned int i, j; 1272ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int gotreply = 0; 1273ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat time_t start, now; 1274ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1275ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_LINUX_NETWORK) || defined (HAVE_SOLARIS_NETWORK) 1276ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if ((fd = make_icmp_sock()) == -1) 1277ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat return 0; 1278ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#else 1279ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int opt = 2000; 1280ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fd = daemon->dhcp_icmp_fd; 1281ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt)); 1282ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1283ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1284ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat saddr.sin_family = AF_INET; 1285ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat saddr.sin_port = 0; 1286ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat saddr.sin_addr = addr; 1287ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_SOCKADDR_SA_LEN 1288ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat saddr.sin_len = sizeof(struct sockaddr_in); 1289ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1290ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1291ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat memset(&packet.icmp, 0, sizeof(packet.icmp)); 1292ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat packet.icmp.icmp_type = ICMP_ECHO; 1293ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat packet.icmp.icmp_id = id; 1294ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (j = 0, i = 0; i < sizeof(struct icmp) / 2; i++) 1295ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat j += ((u16 *)&packet.icmp)[i]; 1296ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat while (j>>16) 1297ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat j = (j & 0xffff) + (j >> 16); 1298ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat packet.icmp.icmp_cksum = (j == 0xffff) ? j : ~j; 1299ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1300ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat while (sendto(fd, (char *)&packet.icmp, sizeof(struct icmp), 0, 1301ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (struct sockaddr *)&saddr, sizeof(saddr)) == -1 && 1302ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat retry_send()); 1303ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1304ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat for (now = start = dnsmasq_time(); 1305ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat difftime(now, start) < (float)PING_WAIT;) 1306ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1307ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct timeval tv; 1308ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat fd_set rset, wset; 1309ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat struct sockaddr_in faddr; 1310ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat int maxfd = fd; 1311ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat socklen_t len = sizeof(faddr); 1312ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1313ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat tv.tv_usec = 250000; 1314ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat tv.tv_sec = 0; 1315ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1316ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ZERO(&rset); 1317ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ZERO(&wset); 1318ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_SET(fd, &rset); 1319ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat set_dns_listeners(now, &rset, &maxfd); 1320ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat set_log_writer(&wset, &maxfd); 1321ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1322ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (select(maxfd+1, &rset, &wset, NULL, &tv) < 0) 1323ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1324ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ZERO(&rset); 1325ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat FD_ZERO(&wset); 1326ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1327ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1328ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat now = dnsmasq_time(); 1329ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1330ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_log_writer(&wset); 1331ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_dns_listeners(&rset, now); 1332ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1333ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#ifdef HAVE_TFTP 1334ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat check_tftp_listeners(&rset, now); 1335ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1336ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1337ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat if (FD_ISSET(fd, &rset) && 1338ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat recvfrom(fd, &packet, sizeof(packet), 0, 1339ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat (struct sockaddr *)&faddr, &len) == sizeof(packet) && 1340ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat saddr.sin_addr.s_addr == faddr.sin_addr.s_addr && 1341ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat packet.icmp.icmp_type == ICMP_ECHOREPLY && 1342ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat packet.icmp.icmp_seq == 0 && 1343ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat packet.icmp.icmp_id == id) 1344ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat { 1345ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat gotreply = 1; 1346ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat break; 1347ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1348ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat } 1349ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1350ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#if defined(HAVE_LINUX_NETWORK) || defined(HAVE_SOLARIS_NETWORK) 1351ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat close(fd); 1352ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#else 1353ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat opt = 1; 1354ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt)); 1355ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1356ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat 1357ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat return gotreply; 1358ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat} 1359ffd68729961f7383f2e35494a03ccdef20f86c98San Mehat#endif 1360