1/* ftpget.c - Fetch file(s) from ftp server 2 * 3 * Copyright 2016 Rob Landley <rob@landley.net> 4 * 5 * No standard for the command, but see https://www.ietf.org/rfc/rfc959.txt 6 * TODO: local can be - 7 * TEST: -g -s (when local and remote exist) -gc, -sc 8 * zero length file 9 10USE_FTPGET(NEWTOY(ftpget, "<2>3P:cp:u:vgslLmMdD[-gs][!gslLmMdD][!clL]", TOYFLAG_USR|TOYFLAG_BIN)) 11USE_FTPPUT(OLDTOY(ftpput, ftpget, TOYFLAG_USR|TOYFLAG_BIN)) 12 13config FTPGET 14 bool "ftpget" 15 default y 16 help 17 usage: ftpget [-cvgslLmMdD] [-P PORT] [-p PASSWORD] [-u USER] HOST [LOCAL] REMOTE 18 19 Talk to ftp server. By default get REMOTE file via passive anonymous 20 transfer, optionally saving under a LOCAL name. Can also send, list, etc. 21 22 -c Continue partial transfer 23 -p Use PORT instead of "21" 24 -P Use PASSWORD instead of "ftpget@" 25 -u Use USER instead of "anonymous" 26 -v Verbose 27 28 Ways to interact with FTP server: 29 -d Delete file 30 -D Remove directory 31 -g Get file (default) 32 -l List directory 33 -L List (filenames only) 34 -m Move file on server from LOCAL to REMOTE 35 -M mkdir 36 -s Send file 37 38config FTPPUT 39 bool "ftpput" 40 default y 41 help 42 An ftpget that defaults to -s instead of -g 43*/ 44 45#define FOR_ftpget 46#include "toys.h" 47 48GLOBALS( 49 char *user; 50 char *port; 51 char *password; 52 53 int fd; 54) 55 56// we should get one line of data, but it may be in multiple chunks 57static int xread2line(int fd, char *buf, int len) 58{ 59 int i, total = 0; 60 61 len--; 62 while (total<len && (i = xread(fd, buf, len-total))) { 63 total += i; 64 if (buf[total-1] == '\n') break; 65 } 66 if (total>=len) error_exit("overflow"); 67 while (total--) 68 if (buf[total]=='\r' || buf[total]=='\n') buf[total] = 0; 69 else break; 70 if (toys.optflags & FLAG_v) fprintf(stderr, "%s\n", toybuf); 71 72 return total+1; 73} 74 75static int ftp_line(char *cmd, char *arg, int must) 76{ 77 int rc = 0; 78 79 if (cmd) { 80 char *s = "%s %s\r\n"+3*(!arg); 81 if (toys.optflags & FLAG_v) fprintf(stderr, s, cmd, arg); 82 dprintf(TT.fd, s, cmd, arg); 83 } 84 if (must>=0) { 85 xread2line(TT.fd, toybuf, sizeof(toybuf)); 86 if (!sscanf(toybuf, "%d", &rc) || (must && rc != must)) 87 error_exit_raw(toybuf); 88 } 89 90 return rc; 91} 92 93void ftpget_main(void) 94{ 95 struct sockaddr_in6 si6; 96 int rc, ii = 1, port; 97 socklen_t sl = sizeof(si6); 98 char *s, *remote = toys.optargs[2]; 99 unsigned long long lenl = 0, lenr; 100 101 if (!(toys.optflags&(FLAG_v-1))) 102 toys.optflags |= (toys.which->name[3]=='g') ? FLAG_g : FLAG_s; 103 104 if (!TT.user) TT.user = "anonymous"; 105 if (!TT.password) TT.password = "ftpget@"; 106 if (!TT.port) TT.port = "21"; 107 if (!remote) remote = toys.optargs[1]; 108 109 // connect 110 TT.fd = xconnect(*toys.optargs, TT.port, 0, SOCK_STREAM, 0, AI_ADDRCONFIG); 111 if (getpeername(TT.fd, (void *)&si6, &sl)) perror_exit("getpeername"); 112 113 // Login 114 ftp_line(0, 0, 220); 115 rc = ftp_line("USER", TT.user, 0); 116 if (rc == 331) rc = ftp_line("PASS", TT.password, 0); 117 if (rc != 230) error_exit_raw(toybuf); 118 119 if (toys.optflags & FLAG_m) { 120 if (toys.optc != 3) error_exit("-m FROM TO"); 121 ftp_line("RNFR", toys.optargs[1], 350); 122 ftp_line("RNTO", toys.optargs[2], 250); 123 } else if (toys.optflags & FLAG_M) ftp_line("MKD", toys.optargs[1], 257); 124 else if (toys.optflags & FLAG_d) ftp_line("DELE", toys.optargs[1], 250); 125 else if (toys.optflags & FLAG_D) ftp_line("RMD", toys.optargs[1], 250); 126 else { 127 int get = !(toys.optflags&FLAG_s), cnt = toys.optflags&FLAG_c; 128 char *cmd; 129 130 // Only do passive binary transfers 131 ftp_line("TYPE", "I", 0); 132 rc = ftp_line("PASV", 0, 0); 133 134 // PASV means the server opens a port you connect to instead of the server 135 // dialing back to the client. (Still insane, but less so.) So need port # 136 137 // PASV output is "227 PASV ok (x,x,x,x,p1,p2)" where x,x,x,x is the IP addr 138 // (must match the server you're talking to???) and port is (256*p1)+p2 139 s = 0; 140 if (rc==227) for (s = toybuf; (s = strchr(s, ',')); s++) { 141 int p1, got = 0; 142 143 sscanf(s, ",%u,%u)%n", &p1, &port, &got); 144 if (!got) continue; 145 port += 256*p1; 146 break; 147 } 148 if (!s || port<1 || port>65535) error_exit_raw(toybuf); 149 si6.sin6_port = SWAP_BE16(port); // same field size/offset for v4 and v6 150 port = xsocket(si6.sin6_family, SOCK_STREAM, 0); 151 if (connect(port, (void *)&si6, sizeof(si6))) perror_exit("connect"); 152 153 // RETR blocks until file data read from data port, so use SIZE to check 154 // if file exists before creating local copy 155 lenr = 0; 156 if (toys.optflags&(FLAG_s|FLAG_g)) { 157 if (ftp_line("SIZE", remote, 0) == 213) 158 sscanf(toybuf, "%*u %llu", &lenr); 159 else if (get) error_exit("no %s", remote); 160 } 161 162 // Open file for reading or writing 163 if (toys.optflags & (FLAG_g|FLAG_s)) { 164 if (strcmp(toys.optargs[1], "-")) 165 ii = xcreate(toys.optargs[1], 166 get ? (cnt ? O_APPEND : O_TRUNC)|O_CREAT|O_WRONLY : O_RDONLY, 0666); 167 lenl = fdlength(ii); 168 } 169 if (get) { 170 cmd = "REST"; 171 if (toys.optflags&FLAG_l) cmd = "LIST"; 172 if (toys.optflags&FLAG_L) cmd = "NLST"; 173 if (cnt) { 174 char buf[32]; 175 176 if (lenl>=lenr) goto done; 177 sprintf(buf, "%llu", lenl); 178 ftp_line("REST", buf, 350); 179 } else lenl = 0; 180 181 ftp_line(cmd, remote, -1); 182 lenl += xsendfile(port, ii); 183 ftp_line(0, 0, (toys.optflags&FLAG_g) ? 226 : 150); 184 } else if (toys.optflags & FLAG_s) { 185 cmd = "STOR"; 186 if (cnt && lenr) { 187 cmd = "APPE"; 188 xlseek(ii, lenl, SEEK_SET); 189 } else lenr = 0; 190 ftp_line(cmd, remote, 150); 191 lenr += xsendfile(ii, port); 192 close(port); 193 } 194 if (toys.optflags&(FLAG_g|FLAG_s)) 195 if (lenl != lenr) error_exit("short %lld/%lld", lenl, lenr); 196 } 197 ftp_line("QUIT", 0, 0); 198 199done: 200 if (CFG_TOYBOX_FREE) { 201 if (ii!=1) xclose(ii); 202 xclose(port); 203 xclose(TT.fd); 204 } 205} 206