1#include <stdio.h> 2#include <stdlib.h> 3#include <unistd.h> 4#include <time.h> 5#include <sys/param.h> 6#include <sys/socket.h> 7#include <linux/sockios.h> 8#include <sys/file.h> 9#include <sys/time.h> 10#include <sys/signal.h> 11#include <sys/ioctl.h> 12#include <net/if.h> 13#include <sys/uio.h> 14#include <sys/poll.h> 15#include <ctype.h> 16#include <errno.h> 17#include <string.h> 18#include <netdb.h> 19#include <setjmp.h> 20 21#ifdef CAPABILITIES 22#include <sys/prctl.h> 23#include <sys/capability.h> 24#endif 25 26#ifdef USE_IDN 27#include <locale.h> 28#include <idna.h> 29#endif 30 31#include <netinet/in.h> 32#include <arpa/inet.h> 33#include <linux/types.h> 34#include <linux/errqueue.h> 35 36#ifdef ANDROID 37#include <linux/icmp.h> 38#include <sys/auxv.h> 39#endif 40 41#include "SNAPSHOT.h" 42 43#define DEFDATALEN (64 - 8) /* default data length */ 44 45#define MAXWAIT 10 /* max seconds to wait for response */ 46#define MININTERVAL 10 /* Minimal interpacket gap */ 47#define MINUSERINTERVAL 200 /* Minimal allowed interval for non-root */ 48 49#define SCHINT(a) (((a) <= MININTERVAL) ? MININTERVAL : (a)) 50 51/* various options */ 52extern int options; 53#define F_FLOOD 0x001 54#define F_INTERVAL 0x002 55#define F_NUMERIC 0x004 56#define F_PINGFILLED 0x008 57#define F_QUIET 0x010 58#define F_RROUTE 0x020 59#define F_SO_DEBUG 0x040 60#define F_SO_DONTROUTE 0x080 61#define F_VERBOSE 0x100 62#define F_TIMESTAMP 0x200 63#define F_FLOWINFO 0x200 64#define F_SOURCEROUTE 0x400 65#define F_TCLASS 0x400 66#define F_FLOOD_POLL 0x800 67#define F_LATENCY 0x1000 68#define F_AUDIBLE 0x2000 69#define F_ADAPTIVE 0x4000 70#define F_STRICTSOURCE 0x8000 71#define F_NOLOOP 0x10000 72#define F_TTL 0x20000 73#define F_MARK 0x40000 74#define F_PTIMEOFDAY 0x80000 75#define F_OUTSTANDING 0x100000 76 77/* 78 * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum 79 * number of received sequence numbers we can keep track of. 80 */ 81#define MAX_DUP_CHK 0x10000 82 83#if defined(__WORDSIZE) && __WORDSIZE == 64 84# define USE_BITMAP64 85#endif 86 87#ifdef USE_BITMAP64 88typedef __u64 bitmap_t; 89# define BITMAP_SHIFT 6 90#else 91typedef __u32 bitmap_t; 92# define BITMAP_SHIFT 5 93#endif 94 95#if ((MAX_DUP_CHK >> (BITMAP_SHIFT + 3)) << (BITMAP_SHIFT + 3)) != MAX_DUP_CHK 96# error Please MAX_DUP_CHK and/or BITMAP_SHIFT 97#endif 98 99struct rcvd_table { 100 bitmap_t bitmap[MAX_DUP_CHK / (sizeof(bitmap_t) * 8)]; 101}; 102 103extern struct rcvd_table rcvd_tbl; 104extern int using_ping_socket; 105 106#define A(bit) (rcvd_tbl.bitmap[(bit) >> BITMAP_SHIFT]) /* identify word in array */ 107#define B(bit) (((bitmap_t)1) << ((bit) & ((1 << BITMAP_SHIFT) - 1))) /* identify bit in word */ 108 109static inline void rcvd_set(__u16 seq) 110{ 111 unsigned bit = seq % MAX_DUP_CHK; 112 A(bit) |= B(bit); 113} 114 115static inline void rcvd_clear(__u16 seq) 116{ 117 unsigned bit = seq % MAX_DUP_CHK; 118 A(bit) &= ~B(bit); 119} 120 121static inline bitmap_t rcvd_test(__u16 seq) 122{ 123 unsigned bit = seq % MAX_DUP_CHK; 124 return A(bit) & B(bit); 125} 126 127extern u_char outpack[]; 128extern int maxpacket; 129 130extern int datalen; 131extern char *hostname; 132extern int uid; 133extern int ident; /* process id to identify our packets */ 134 135extern int sndbuf; 136extern int ttl; 137 138extern long npackets; /* max packets to transmit */ 139extern long nreceived; /* # of packets we got back */ 140extern long nrepeats; /* number of duplicates */ 141extern long ntransmitted; /* sequence # for outbound packets = #sent */ 142extern long nchecksum; /* replies with bad checksum */ 143extern long nerrors; /* icmp errors */ 144extern int interval; /* interval between packets (msec) */ 145extern int preload; 146extern int deadline; /* time to die */ 147extern int lingertime; 148extern struct timeval start_time, cur_time; 149extern volatile int exiting; 150extern volatile int status_snapshot; 151extern int confirm; 152extern int confirm_flag; 153extern int working_recverr; 154 155extern volatile int in_pr_addr; /* pr_addr() is executing */ 156extern jmp_buf pr_addr_jmp; 157 158#ifndef MSG_CONFIRM 159#define MSG_CONFIRM 0 160#endif 161 162 163/* timing */ 164extern int timing; /* flag to do timing */ 165extern long tmin; /* minimum round trip time */ 166extern long tmax; /* maximum round trip time */ 167extern long long tsum; /* sum of all times, for doing average */ 168extern long long tsum2; 169extern int rtt; 170extern __u16 acked; 171extern int pipesize; 172 173#define COMMON_OPTIONS \ 174case 'a': case 'U': case 'c': case 'd': \ 175case 'f': case 'i': case 'w': case 'l': \ 176case 'S': case 'n': case 'p': case 'q': \ 177case 'r': case 's': case 'v': case 'L': \ 178case 't': case 'A': case 'W': case 'B': case 'm': \ 179case 'D': case 'O': 180 181#define COMMON_OPTSTR "h?VQ:I:M:aUc:dfi:w:l:S:np:qrs:vLt:AW:Bm:DO" 182 183/* 184 * Write to stdout 185 */ 186static inline void write_stdout(const char *str, size_t len) 187{ 188 size_t o = 0; 189 ssize_t cc; 190 do { 191 cc = write(STDOUT_FILENO, str + o, len - o); 192 o += cc; 193 } while (len > o || cc < 0); 194} 195 196/* 197 * tvsub -- 198 * Subtract 2 timeval structs: out = out - in. Out is assumed to 199 * be >= in. 200 */ 201static inline void tvsub(struct timeval *out, struct timeval *in) 202{ 203 if ((out->tv_usec -= in->tv_usec) < 0) { 204 --out->tv_sec; 205 out->tv_usec += 1000000; 206 } 207 out->tv_sec -= in->tv_sec; 208} 209 210static inline void set_signal(int signo, void (*handler)(int)) 211{ 212 struct sigaction sa; 213 214 memset(&sa, 0, sizeof(sa)); 215 216 sa.sa_handler = (void (*)(int))handler; 217#ifdef SA_INTERRUPT 218 sa.sa_flags = SA_INTERRUPT; 219#endif 220 sigaction(signo, &sa, NULL); 221} 222 223extern int __schedule_exit(int next); 224 225static inline int schedule_exit(int next) 226{ 227 if (npackets && ntransmitted >= npackets && !deadline) 228 next = __schedule_exit(next); 229 return next; 230} 231 232static inline int in_flight(void) 233{ 234 __u16 diff = (__u16)ntransmitted - acked; 235 return (diff<=0x7FFF) ? diff : ntransmitted-nreceived-nerrors; 236} 237 238static inline void acknowledge(__u16 seq) 239{ 240 __u16 diff = (__u16)ntransmitted - seq; 241 if (diff <= 0x7FFF) { 242 if ((int)diff+1 > pipesize) 243 pipesize = (int)diff+1; 244 if ((__s16)(seq - acked) > 0 || 245 (__u16)ntransmitted - acked > 0x7FFF) 246 acked = seq; 247 } 248} 249 250static inline void advance_ntransmitted(void) 251{ 252 ntransmitted++; 253 /* Invalidate acked, if 16 bit seq overflows. */ 254 if ((__u16)ntransmitted - acked > 0x7FFF) 255 acked = (__u16)ntransmitted + 1; 256} 257 258extern void limit_capabilities(void); 259static int enable_capability_raw(void); 260static int disable_capability_raw(void); 261static int enable_capability_admin(void); 262static int disable_capability_admin(void); 263#ifdef CAPABILITIES 264extern int modify_capability(cap_value_t, cap_flag_value_t); 265static inline int enable_capability_raw(void) { return modify_capability(CAP_NET_RAW, CAP_SET); }; 266static inline int disable_capability_raw(void) { return modify_capability(CAP_NET_RAW, CAP_CLEAR); }; 267static inline int enable_capability_admin(void) { return modify_capability(CAP_NET_ADMIN, CAP_SET); }; 268static inline int disable_capability_admin(void) { return modify_capability(CAP_NET_ADMIN, CAP_CLEAR); }; 269#else 270extern int modify_capability(int); 271static inline int enable_capability_raw(void) { return modify_capability(1); }; 272static inline int disable_capability_raw(void) { return modify_capability(0); }; 273static inline int enable_capability_admin(void) { return modify_capability(1); }; 274static inline int disable_capability_admin(void) { return modify_capability(0); }; 275#endif 276extern void drop_capabilities(void); 277extern void android_check_security(void); 278 279extern int send_probe(void); 280extern int receive_error_msg(void); 281extern int parse_reply(struct msghdr *msg, int len, void *addr, struct timeval *); 282extern void install_filter(void); 283extern int is_ours(uint16_t id); 284 285extern int pinger(void); 286extern void sock_setbufs(int icmp_sock, int alloc); 287extern void setup(int icmp_sock); 288extern void main_loop(int icmp_sock, __u8 *buf, int buflen) __attribute__((noreturn)); 289extern void finish(void) __attribute__((noreturn)); 290extern void status(void); 291extern void common_options(int ch); 292extern int gather_statistics(__u8 *ptr, int icmplen, 293 int cc, __u16 seq, int hops, 294 int csfailed, struct timeval *tv, char *from, 295 void (*pr_reply)(__u8 *ptr, int cc)); 296extern void print_timestamp(void); 297