ftp.c revision 87315
1144966Svkashyap/*- 2169400Sscottl * Copyright (c) 1998 Dag-Erling Co�dan Sm�rgrav 3144966Svkashyap * All rights reserved. 4144966Svkashyap * 5144966Svkashyap * Redistribution and use in source and binary forms, with or without 6144966Svkashyap * modification, are permitted provided that the following conditions 7144966Svkashyap * are met: 8144966Svkashyap * 1. Redistributions of source code must retain the above copyright 9144966Svkashyap * notice, this list of conditions and the following disclaimer 10144966Svkashyap * in this position and unchanged. 11144966Svkashyap * 2. Redistributions in binary form must reproduce the above copyright 12144966Svkashyap * notice, this list of conditions and the following disclaimer in the 13144966Svkashyap * documentation and/or other materials provided with the distribution. 14144966Svkashyap * 3. The name of the author may not be used to endorse or promote products 15144966Svkashyap * derived from this software without specific prior written permission 16144966Svkashyap * 17144966Svkashyap * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18144966Svkashyap * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19144966Svkashyap * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20144966Svkashyap * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21144966Svkashyap * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22144966Svkashyap * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23144966Svkashyap * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24144966Svkashyap * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25144966Svkashyap * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26144966Svkashyap * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27144966Svkashyap */ 28144966Svkashyap 29144966Svkashyap#include <sys/cdefs.h> 30144966Svkashyap__FBSDID("$FreeBSD: head/lib/libfetch/ftp.c 87315 2001-12-04 01:09:19Z des $"); 31144966Svkashyap 32144966Svkashyap/* 33144966Svkashyap * Portions of this code were taken from or based on ftpio.c: 34169400Sscottl * 35144966Svkashyap * ---------------------------------------------------------------------------- 36144966Svkashyap * "THE BEER-WARE LICENSE" (Revision 42): 37144966Svkashyap * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you 38144966Svkashyap * can do whatever you want with this stuff. If we meet some day, and you think 39144966Svkashyap * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 40144966Svkashyap * ---------------------------------------------------------------------------- 41144966Svkashyap * 42144966Svkashyap * Major Changelog: 43144966Svkashyap * 44144966Svkashyap * Dag-Erling Co�dan Sm�rgrav 45144966Svkashyap * 9 Jun 1998 46144966Svkashyap * 47144966Svkashyap * Incorporated into libfetch 48144966Svkashyap * 49144966Svkashyap * Jordan K. Hubbard 50144966Svkashyap * 17 Jan 1996 51144966Svkashyap * 52144966Svkashyap * Turned inside out. Now returns xfers as new file ids, not as a special 53144966Svkashyap * `state' of FTP_t 54144966Svkashyap * 55144966Svkashyap * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $ 56152213Svkashyap * 57144966Svkashyap */ 58144966Svkashyap 59144966Svkashyap#include <sys/param.h> 60144966Svkashyap#include <sys/socket.h> 61144966Svkashyap#include <netinet/in.h> 62144966Svkashyap 63144966Svkashyap#include <ctype.h> 64144966Svkashyap#include <err.h> 65144966Svkashyap#include <errno.h> 66144966Svkashyap#include <fcntl.h> 67144966Svkashyap#include <netdb.h> 68144966Svkashyap#include <stdarg.h> 69144966Svkashyap#include <stdio.h> 70144966Svkashyap#include <stdlib.h> 71144966Svkashyap#include <string.h> 72144966Svkashyap#include <time.h> 73144966Svkashyap#include <unistd.h> 74144966Svkashyap 75144966Svkashyap#include "fetch.h" 76144966Svkashyap#include "common.h" 77144966Svkashyap#include "ftperr.h" 78144966Svkashyap 79144966Svkashyap#define FTP_ANONYMOUS_USER "anonymous" 80144966Svkashyap 81144966Svkashyap#define FTP_CONNECTION_ALREADY_OPEN 125 82144966Svkashyap#define FTP_OPEN_DATA_CONNECTION 150 83144966Svkashyap#define FTP_OK 200 84144966Svkashyap#define FTP_FILE_STATUS 213 85144966Svkashyap#define FTP_SERVICE_READY 220 86144966Svkashyap#define FTP_TRANSFER_COMPLETE 226 87144966Svkashyap#define FTP_PASSIVE_MODE 227 88144966Svkashyap#define FTP_LPASSIVE_MODE 228 89144966Svkashyap#define FTP_EPASSIVE_MODE 229 90144966Svkashyap#define FTP_LOGGED_IN 230 91144966Svkashyap#define FTP_FILE_ACTION_OK 250 92212008Sdelphij#define FTP_NEED_PASSWORD 331 93144966Svkashyap#define FTP_NEED_ACCOUNT 332 94144966Svkashyap#define FTP_FILE_OK 350 95144966Svkashyap#define FTP_SYNTAX_ERROR 500 96144966Svkashyap#define FTP_PROTOCOL_ERROR 999 97144966Svkashyap 98144966Svkashyapstatic struct url cached_host; 99144966Svkashyapstatic int cached_socket; 100144966Svkashyap 101152213Svkashyapstatic char *last_reply; 102152213Svkashyapstatic size_t lr_size, lr_length; 103144966Svkashyapstatic int last_code; 104152213Svkashyap 105144966Svkashyap#define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 106144966Svkashyap && isdigit(foo[2]) \ 107144966Svkashyap && (foo[3] == ' ' || foo[3] == '\0')) 108144966Svkashyap#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ 109144966Svkashyap && isdigit(foo[2]) && foo[3] == '-') 110144966Svkashyap 111144966Svkashyap/* translate IPv4 mapped IPv6 address to IPv4 address */ 112144966Svkashyapstatic void 113144966Svkashyapunmappedaddr(struct sockaddr_in6 *sin6) 114144966Svkashyap{ 115144966Svkashyap struct sockaddr_in *sin4; 116144966Svkashyap u_int32_t addr; 117144966Svkashyap int port; 118144966Svkashyap 119144966Svkashyap if (sin6->sin6_family != AF_INET6 || 120144966Svkashyap !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 121144966Svkashyap return; 122144966Svkashyap sin4 = (struct sockaddr_in *)sin6; 123144966Svkashyap addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12]; 124144966Svkashyap port = sin6->sin6_port; 125144966Svkashyap memset(sin4, 0, sizeof(struct sockaddr_in)); 126144966Svkashyap sin4->sin_addr.s_addr = addr; 127144966Svkashyap sin4->sin_port = port; 128144966Svkashyap sin4->sin_family = AF_INET; 129144966Svkashyap sin4->sin_len = sizeof(struct sockaddr_in); 130144966Svkashyap} 131144966Svkashyap 132144966Svkashyap/* 133144966Svkashyap * Get server response 134144966Svkashyap */ 135144966Svkashyapstatic int 136144966Svkashyap_ftp_chkerr(int cd) 137144966Svkashyap{ 138144966Svkashyap if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { 139144966Svkashyap _fetch_syserr(); 140144966Svkashyap return -1; 141144966Svkashyap } 142144966Svkashyap if (isftpinfo(last_reply)) { 143144966Svkashyap while (lr_length && !isftpreply(last_reply)) { 144208969Sdelphij if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { 145152213Svkashyap _fetch_syserr(); 146152213Svkashyap return -1; 147152213Svkashyap } 148152213Svkashyap } 149144966Svkashyap } 150152213Svkashyap 151152213Svkashyap while (lr_length && isspace(last_reply[lr_length-1])) 152144966Svkashyap lr_length--; 153144966Svkashyap last_reply[lr_length] = 0; 154144966Svkashyap 155144966Svkashyap if (!isftpreply(last_reply)) { 156144966Svkashyap _ftp_seterr(FTP_PROTOCOL_ERROR); 157152213Svkashyap return -1; 158152213Svkashyap } 159152213Svkashyap 160152213Svkashyap last_code = (last_reply[0] - '0') * 100 161152213Svkashyap + (last_reply[1] - '0') * 10 162152213Svkashyap + (last_reply[2] - '0'); 163152213Svkashyap 164152213Svkashyap return last_code; 165152213Svkashyap} 166152213Svkashyap 167144966Svkashyap/* 168144966Svkashyap * Send a command and check reply 169144966Svkashyap */ 170144966Svkashyapstatic int 171144966Svkashyap_ftp_cmd(int cd, const char *fmt, ...) 172152213Svkashyap{ 173152213Svkashyap va_list ap; 174152213Svkashyap size_t len; 175144966Svkashyap char *msg; 176144966Svkashyap int r; 177144966Svkashyap 178144966Svkashyap va_start(ap, fmt); 179144966Svkashyap len = vasprintf(&msg, fmt, ap); 180144966Svkashyap va_end(ap); 181144966Svkashyap 182144966Svkashyap if (msg == NULL) { 183144966Svkashyap errno = ENOMEM; 184144966Svkashyap _fetch_syserr(); 185144966Svkashyap return -1; 186144966Svkashyap } 187144966Svkashyap 188144966Svkashyap r = _fetch_putln(cd, msg, len); 189144966Svkashyap free(msg); 190144966Svkashyap 191144966Svkashyap if (r == -1) { 192144966Svkashyap _fetch_syserr(); 193144966Svkashyap return -1; 194144966Svkashyap } 195144966Svkashyap 196152213Svkashyap return _ftp_chkerr(cd); 197144966Svkashyap} 198144966Svkashyap 199144966Svkashyap/* 200144966Svkashyap * Return a pointer to the filename part of a path 201144966Svkashyap */ 202144966Svkashyapstatic const char * 203144966Svkashyap_ftp_filename(const char *file) 204144966Svkashyap{ 205144966Svkashyap char *s; 206144966Svkashyap 207144966Svkashyap if ((s = strrchr(file, '/')) == NULL) 208144966Svkashyap return file; 209144966Svkashyap else 210144966Svkashyap return s + 1; 211144966Svkashyap} 212144966Svkashyap 213144966Svkashyap/* 214144966Svkashyap * Change working directory to the directory that contains the 215144966Svkashyap * specified file. 216144966Svkashyap */ 217144966Svkashyapstatic int 218144966Svkashyap_ftp_cwd(int cd, const char *file) 219144966Svkashyap{ 220144966Svkashyap char *s; 221144966Svkashyap int e; 222144966Svkashyap 223144966Svkashyap if ((s = strrchr(file, '/')) == NULL || s == file) { 224144966Svkashyap e = _ftp_cmd(cd, "CWD /"); 225144966Svkashyap } else { 226144966Svkashyap e = _ftp_cmd(cd, "CWD %.*s", s - file, file); 227144966Svkashyap } 228144966Svkashyap if (e != FTP_FILE_ACTION_OK) { 229144966Svkashyap _ftp_seterr(e); 230144966Svkashyap return -1; 231144966Svkashyap } 232144966Svkashyap return 0; 233144966Svkashyap} 234144966Svkashyap 235144966Svkashyap/* 236144966Svkashyap * Request and parse file stats 237144966Svkashyap */ 238144966Svkashyapstatic int 239144966Svkashyap_ftp_stat(int cd, const char *file, struct url_stat *us) 240144966Svkashyap{ 241144966Svkashyap char *ln; 242144966Svkashyap const char *s; 243144966Svkashyap struct tm tm; 244144966Svkashyap time_t t; 245144966Svkashyap int e; 246144966Svkashyap 247144966Svkashyap us->size = -1; 248144966Svkashyap us->atime = us->mtime = 0; 249144966Svkashyap 250144966Svkashyap if ((s = strrchr(file, '/')) == NULL) 251144966Svkashyap s = file; 252144966Svkashyap else 253144966Svkashyap ++s; 254144966Svkashyap 255144966Svkashyap if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) { 256144966Svkashyap _ftp_seterr(e); 257144966Svkashyap return -1; 258144966Svkashyap } 259144966Svkashyap for (ln = last_reply + 4; *ln && isspace(*ln); ln++) 260144966Svkashyap /* nothing */ ; 261144966Svkashyap for (us->size = 0; *ln && isdigit(*ln); ln++) 262144966Svkashyap us->size = us->size * 10 + *ln - '0'; 263144966Svkashyap if (*ln && !isspace(*ln)) { 264144966Svkashyap _ftp_seterr(FTP_PROTOCOL_ERROR); 265144966Svkashyap us->size = -1; 266144966Svkashyap return -1; 267144966Svkashyap } 268144966Svkashyap if (us->size == 0) 269144966Svkashyap us->size = -1; 270144966Svkashyap DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", (long long)us->size)); 271144966Svkashyap 272144966Svkashyap if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) { 273144966Svkashyap _ftp_seterr(e); 274144966Svkashyap return -1; 275144966Svkashyap } 276144966Svkashyap for (ln = last_reply + 4; *ln && isspace(*ln); ln++) 277144966Svkashyap /* nothing */ ; 278144966Svkashyap switch (strspn(ln, "0123456789")) { 279144966Svkashyap case 14: 280144966Svkashyap break; 281144966Svkashyap case 15: 282144966Svkashyap ln++; 283144966Svkashyap ln[0] = '2'; 284144966Svkashyap ln[1] = '0'; 285144966Svkashyap break; 286144966Svkashyap default: 287144966Svkashyap _ftp_seterr(FTP_PROTOCOL_ERROR); 288144966Svkashyap return -1; 289144966Svkashyap } 290144966Svkashyap if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", 291144966Svkashyap &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 292144966Svkashyap &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { 293144966Svkashyap _ftp_seterr(FTP_PROTOCOL_ERROR); 294144966Svkashyap return -1; 295144966Svkashyap } 296144966Svkashyap tm.tm_mon--; 297144966Svkashyap tm.tm_year -= 1900; 298144966Svkashyap tm.tm_isdst = -1; 299144966Svkashyap t = timegm(&tm); 300144966Svkashyap if (t == (time_t)-1) 301144966Svkashyap t = time(NULL); 302144966Svkashyap us->mtime = t; 303144966Svkashyap us->atime = t; 304144966Svkashyap DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d " 305144966Svkashyap "%02d:%02d:%02d\033[m]\n", 306144966Svkashyap tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 307144966Svkashyap tm.tm_hour, tm.tm_min, tm.tm_sec)); 308144966Svkashyap return 0; 309144966Svkashyap} 310144966Svkashyap 311144966Svkashyap/* 312144966Svkashyap * I/O functions for FTP 313144966Svkashyap */ 314144966Svkashyapstruct ftpio { 315144966Svkashyap int csd; /* Control socket descriptor */ 316144966Svkashyap int dsd; /* Data socket descriptor */ 317144966Svkashyap int dir; /* Direction */ 318144966Svkashyap int eof; /* EOF reached */ 319144966Svkashyap int err; /* Error code */ 320144966Svkashyap}; 321144966Svkashyap 322144966Svkashyapstatic int _ftp_readfn(void *, char *, int); 323144966Svkashyapstatic int _ftp_writefn(void *, const char *, int); 324144966Svkashyapstatic fpos_t _ftp_seekfn(void *, fpos_t, int); 325144966Svkashyapstatic int _ftp_closefn(void *); 326144966Svkashyap 327144966Svkashyapstatic int 328144966Svkashyap_ftp_readfn(void *v, char *buf, int len) 329144966Svkashyap{ 330144966Svkashyap struct ftpio *io; 331144966Svkashyap int r; 332144966Svkashyap 333144966Svkashyap io = (struct ftpio *)v; 334144966Svkashyap if (io == NULL) { 335144966Svkashyap errno = EBADF; 336144966Svkashyap return -1; 337144966Svkashyap } 338144966Svkashyap if (io->csd == -1 || io->dsd == -1 || io->dir == O_WRONLY) { 339144966Svkashyap errno = EBADF; 340144966Svkashyap return -1; 341144966Svkashyap } 342144966Svkashyap if (io->err) { 343144966Svkashyap errno = io->err; 344144966Svkashyap return -1; 345144966Svkashyap } 346144966Svkashyap if (io->eof) 347144966Svkashyap return 0; 348144966Svkashyap r = read(io->dsd, buf, len); 349144966Svkashyap if (r > 0) 350144966Svkashyap return r; 351144966Svkashyap if (r == 0) { 352144966Svkashyap io->eof = 1; 353144966Svkashyap return 0; 354144966Svkashyap } 355144966Svkashyap if (errno != EINTR) 356144966Svkashyap io->err = errno; 357144966Svkashyap return -1; 358144966Svkashyap} 359144966Svkashyap 360144966Svkashyapstatic int 361144966Svkashyap_ftp_writefn(void *v, const char *buf, int len) 362144966Svkashyap{ 363144966Svkashyap struct ftpio *io; 364144966Svkashyap int w; 365144966Svkashyap 366144966Svkashyap io = (struct ftpio *)v; 367144966Svkashyap if (io == NULL) { 368144966Svkashyap errno = EBADF; 369152213Svkashyap return -1; 370152213Svkashyap } 371152213Svkashyap if (io->csd == -1 || io->dsd == -1 || io->dir == O_RDONLY) { 372152213Svkashyap errno = EBADF; 373144966Svkashyap return -1; 374144966Svkashyap } 375144966Svkashyap if (io->err) { 376144966Svkashyap errno = io->err; 377144966Svkashyap return -1; 378144966Svkashyap } 379144966Svkashyap w = write(io->dsd, buf, len); 380144966Svkashyap if (w >= 0) 381144966Svkashyap return w; 382144966Svkashyap if (errno != EINTR) 383144966Svkashyap io->err = errno; 384144966Svkashyap return -1; 385144966Svkashyap} 386144966Svkashyap 387144966Svkashyapstatic fpos_t 388144966Svkashyap_ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) 389144966Svkashyap{ 390144966Svkashyap struct ftpio *io; 391144966Svkashyap 392144966Svkashyap io = (struct ftpio *)v; 393144966Svkashyap if (io == NULL) { 394144966Svkashyap errno = EBADF; 395144966Svkashyap return -1; 396144966Svkashyap } 397144966Svkashyap errno = ESPIPE; 398144966Svkashyap return -1; 399144966Svkashyap} 400144966Svkashyap 401144966Svkashyapstatic int 402144966Svkashyap_ftp_closefn(void *v) 403144966Svkashyap{ 404144966Svkashyap struct ftpio *io; 405144966Svkashyap int r; 406144966Svkashyap 407144966Svkashyap io = (struct ftpio *)v; 408144966Svkashyap if (io == NULL) { 409144966Svkashyap errno = EBADF; 410144966Svkashyap return -1; 411144966Svkashyap } 412144966Svkashyap if (io->dir == -1) 413144966Svkashyap return 0; 414144966Svkashyap if (io->csd == -1 || io->dsd == -1) { 415144966Svkashyap errno = EBADF; 416144966Svkashyap return -1; 417144966Svkashyap } 418144966Svkashyap close(io->dsd); 419144966Svkashyap io->dir = -1; 420144966Svkashyap io->dsd = -1; 421144966Svkashyap DEBUG(fprintf(stderr, "Waiting for final status\n")); 422144966Svkashyap r = _ftp_chkerr(io->csd); 423144966Svkashyap close(io->csd); 424144966Svkashyap free(io); 425144966Svkashyap return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; 426144966Svkashyap} 427144966Svkashyap 428144966Svkashyapstatic FILE * 429152213Svkashyap_ftp_setup(int csd, int dsd, int mode) 430152213Svkashyap{ 431152213Svkashyap struct ftpio *io; 432152213Svkashyap FILE *f; 433152213Svkashyap 434152213Svkashyap if ((io = malloc(sizeof *io)) == NULL) 435144966Svkashyap return NULL; 436144966Svkashyap io->csd = dup(csd); 437144966Svkashyap io->dsd = dsd; 438144966Svkashyap io->dir = mode; 439144966Svkashyap io->eof = io->err = 0; 440144966Svkashyap f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn); 441144966Svkashyap if (f == NULL) 442144966Svkashyap free(io); 443144966Svkashyap return f; 444144966Svkashyap} 445144966Svkashyap 446144966Svkashyap/* 447144966Svkashyap * Transfer file 448144966Svkashyap */ 449144966Svkashyapstatic FILE * 450_ftp_transfer(int cd, const char *oper, const char *file, 451 int mode, off_t offset, const char *flags) 452{ 453 struct sockaddr_storage sa; 454 struct sockaddr_in6 *sin6; 455 struct sockaddr_in *sin4; 456 int low, pasv, verbose; 457 int e, sd = -1; 458 socklen_t l; 459 char *s; 460 FILE *df; 461 462 /* check flags */ 463 low = CHECK_FLAG('l'); 464 pasv = CHECK_FLAG('p'); 465 verbose = CHECK_FLAG('v'); 466 467 /* passive mode */ 468 if (!pasv) 469 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && 470 strncasecmp(s, "no", 2) != 0); 471 472 /* find our own address, bind, and listen */ 473 l = sizeof sa; 474 if (getsockname(cd, (struct sockaddr *)&sa, &l) == -1) 475 goto sysouch; 476 if (sa.ss_family == AF_INET6) 477 unmappedaddr((struct sockaddr_in6 *)&sa); 478 479 /* open data socket */ 480 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 481 _fetch_syserr(); 482 return NULL; 483 } 484 485 if (pasv) { 486 u_char addr[64]; 487 char *ln, *p; 488 unsigned int i; 489 int port; 490 491 /* send PASV command */ 492 if (verbose) 493 _fetch_info("setting passive mode"); 494 switch (sa.ss_family) { 495 case AF_INET: 496 if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE) 497 goto ouch; 498 break; 499 case AF_INET6: 500 if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) { 501 if (e == -1) 502 goto ouch; 503 if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE) 504 goto ouch; 505 } 506 break; 507 default: 508 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 509 goto ouch; 510 } 511 512 /* 513 * Find address and port number. The reply to the PASV command 514 * is IMHO the one and only weak point in the FTP protocol. 515 */ 516 ln = last_reply; 517 switch (e) { 518 case FTP_PASSIVE_MODE: 519 case FTP_LPASSIVE_MODE: 520 for (p = ln + 3; *p && !isdigit(*p); p++) 521 /* nothing */ ; 522 if (!*p) { 523 e = FTP_PROTOCOL_ERROR; 524 goto ouch; 525 } 526 l = (e == FTP_PASSIVE_MODE ? 6 : 21); 527 for (i = 0; *p && i < l; i++, p++) 528 addr[i] = strtol(p, &p, 10); 529 if (i < l) { 530 e = FTP_PROTOCOL_ERROR; 531 goto ouch; 532 } 533 break; 534 case FTP_EPASSIVE_MODE: 535 for (p = ln + 3; *p && *p != '('; p++) 536 /* nothing */ ; 537 if (!*p) { 538 e = FTP_PROTOCOL_ERROR; 539 goto ouch; 540 } 541 ++p; 542 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], 543 &port, &addr[3]) != 5 || 544 addr[0] != addr[1] || 545 addr[0] != addr[2] || addr[0] != addr[3]) { 546 e = FTP_PROTOCOL_ERROR; 547 goto ouch; 548 } 549 break; 550 } 551 552 /* seek to required offset */ 553 if (offset) 554 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK) 555 goto sysouch; 556 557 /* construct sockaddr for data socket */ 558 l = sizeof sa; 559 if (getpeername(cd, (struct sockaddr *)&sa, &l) == -1) 560 goto sysouch; 561 if (sa.ss_family == AF_INET6) 562 unmappedaddr((struct sockaddr_in6 *)&sa); 563 switch (sa.ss_family) { 564 case AF_INET6: 565 sin6 = (struct sockaddr_in6 *)&sa; 566 if (e == FTP_EPASSIVE_MODE) 567 sin6->sin6_port = htons(port); 568 else { 569 bcopy(addr + 2, (char *)&sin6->sin6_addr, 16); 570 bcopy(addr + 19, (char *)&sin6->sin6_port, 2); 571 } 572 break; 573 case AF_INET: 574 sin4 = (struct sockaddr_in *)&sa; 575 if (e == FTP_EPASSIVE_MODE) 576 sin4->sin_port = htons(port); 577 else { 578 bcopy(addr, (char *)&sin4->sin_addr, 4); 579 bcopy(addr + 4, (char *)&sin4->sin_port, 2); 580 } 581 break; 582 default: 583 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 584 break; 585 } 586 587 /* connect to data port */ 588 if (verbose) 589 _fetch_info("opening data connection"); 590 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 591 goto sysouch; 592 593 /* make the server initiate the transfer */ 594 if (verbose) 595 _fetch_info("initiating transfer"); 596 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file)); 597 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) 598 goto ouch; 599 600 } else { 601 u_int32_t a; 602 u_short p; 603 int arg, d; 604 char *ap; 605 char hname[INET6_ADDRSTRLEN]; 606 607 switch (sa.ss_family) { 608 case AF_INET6: 609 ((struct sockaddr_in6 *)&sa)->sin6_port = 0; 610#ifdef IPV6_PORTRANGE 611 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; 612 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, 613 (char *)&arg, sizeof(arg)) == -1) 614 goto sysouch; 615#endif 616 break; 617 case AF_INET: 618 ((struct sockaddr_in *)&sa)->sin_port = 0; 619 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; 620 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 621 (char *)&arg, sizeof arg) == -1) 622 goto sysouch; 623 break; 624 } 625 if (verbose) 626 _fetch_info("binding data socket"); 627 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) 628 goto sysouch; 629 if (listen(sd, 1) == -1) 630 goto sysouch; 631 632 /* find what port we're on and tell the server */ 633 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) 634 goto sysouch; 635 switch (sa.ss_family) { 636 case AF_INET: 637 sin4 = (struct sockaddr_in *)&sa; 638 a = ntohl(sin4->sin_addr.s_addr); 639 p = ntohs(sin4->sin_port); 640 e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d", 641 (a >> 24) & 0xff, (a >> 16) & 0xff, 642 (a >> 8) & 0xff, a & 0xff, 643 (p >> 8) & 0xff, p & 0xff); 644 break; 645 case AF_INET6: 646#define UC(b) (((int)b)&0xff) 647 e = -1; 648 sin6 = (struct sockaddr_in6 *)&sa; 649 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, 650 hname, sizeof(hname), 651 NULL, 0, NI_NUMERICHOST) == 0) { 652 e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname, 653 htons(sin6->sin6_port)); 654 if (e == -1) 655 goto ouch; 656 } 657 if (e != FTP_OK) { 658 ap = (char *)&sin6->sin6_addr; 659 e = _ftp_cmd(cd, 660 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 661 6, 16, 662 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), 663 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), 664 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), 665 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 666 2, 667 (ntohs(sin6->sin6_port) >> 8) & 0xff, 668 ntohs(sin6->sin6_port) & 0xff); 669 } 670 break; 671 default: 672 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ 673 goto ouch; 674 } 675 if (e != FTP_OK) 676 goto ouch; 677 678 /* seek to required offset */ 679 if (offset) 680 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK) 681 goto sysouch; 682 683 /* make the server initiate the transfer */ 684 if (verbose) 685 _fetch_info("initiating transfer"); 686 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file)); 687 if (e != FTP_OPEN_DATA_CONNECTION) 688 goto ouch; 689 690 /* accept the incoming connection and go to town */ 691 if ((d = accept(sd, NULL, NULL)) == -1) 692 goto sysouch; 693 close(sd); 694 sd = d; 695 } 696 697 if ((df = _ftp_setup(cd, sd, mode)) == NULL) 698 goto sysouch; 699 return df; 700 701sysouch: 702 _fetch_syserr(); 703 if (sd >= 0) 704 close(sd); 705 return NULL; 706 707ouch: 708 if (e != -1) 709 _ftp_seterr(e); 710 if (sd >= 0) 711 close(sd); 712 return NULL; 713} 714 715/* 716 * Authenticate 717 */ 718static int 719_ftp_authenticate(int cd, struct url *url, struct url *purl) 720{ 721 const char *user, *pwd, *logname; 722 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; 723 int e, len; 724 725 /* XXX FTP_AUTH, and maybe .netrc */ 726 727 /* send user name and password */ 728 user = url->user; 729 if (!user || !*user) 730 user = getenv("FTP_LOGIN"); 731 if (!user || !*user) 732 user = FTP_ANONYMOUS_USER; 733 if (purl && url->port == _fetch_default_port(url->scheme)) 734 e = _ftp_cmd(cd, "USER %s@%s", user, url->host); 735 else if (purl) 736 e = _ftp_cmd(cd, "USER %s@%s@%d", user, url->host, url->port); 737 else 738 e = _ftp_cmd(cd, "USER %s", user); 739 740 /* did the server request a password? */ 741 if (e == FTP_NEED_PASSWORD) { 742 pwd = url->pwd; 743 if (!pwd || !*pwd) 744 pwd = getenv("FTP_PASSWORD"); 745 if (!pwd || !*pwd) { 746 if ((logname = getlogin()) == 0) 747 logname = FTP_ANONYMOUS_USER; 748 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) 749 len = 0; 750 else if (len > MAXLOGNAME) 751 len = MAXLOGNAME; 752 gethostname(pbuf + len, sizeof pbuf - len); 753 pwd = pbuf; 754 } 755 e = _ftp_cmd(cd, "PASS %s", pwd); 756 } 757 758 return e; 759} 760 761/* 762 * Log on to FTP server 763 */ 764static int 765_ftp_connect(struct url *url, struct url *purl, const char *flags) 766{ 767 int cd, e, direct, verbose; 768#ifdef INET6 769 int af = AF_UNSPEC; 770#else 771 int af = AF_INET; 772#endif 773 774 direct = CHECK_FLAG('d'); 775 verbose = CHECK_FLAG('v'); 776 if (CHECK_FLAG('4')) 777 af = AF_INET; 778 else if (CHECK_FLAG('6')) 779 af = AF_INET6; 780 781 if (direct) 782 purl = NULL; 783 784 /* check for proxy */ 785 if (purl) { 786 /* XXX proxy authentication! */ 787 cd = _fetch_connect(purl->host, purl->port, af, verbose); 788 } else { 789 /* no proxy, go straight to target */ 790 cd = _fetch_connect(url->host, url->port, af, verbose); 791 purl = NULL; 792 } 793 794 /* check connection */ 795 if (cd == -1) { 796 _fetch_syserr(); 797 return NULL; 798 } 799 800 /* expect welcome message */ 801 if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY) 802 goto fouch; 803 804 /* authenticate */ 805 if ((e = _ftp_authenticate(cd, url, purl)) != FTP_LOGGED_IN) 806 goto fouch; 807 808 /* might as well select mode and type at once */ 809#ifdef FTP_FORCE_STREAM_MODE 810 if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */ 811 goto fouch; 812#endif 813 if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */ 814 goto fouch; 815 816 /* done */ 817 return cd; 818 819fouch: 820 if (e != -1) 821 _ftp_seterr(e); 822 close(cd); 823 return NULL; 824} 825 826/* 827 * Disconnect from server 828 */ 829static void 830_ftp_disconnect(int cd) 831{ 832 (void)_ftp_cmd(cd, "QUIT"); 833 close(cd); 834} 835 836/* 837 * Check if we're already connected 838 */ 839static int 840_ftp_isconnected(struct url *url) 841{ 842 return (cached_socket 843 && (strcmp(url->host, cached_host.host) == 0) 844 && (strcmp(url->user, cached_host.user) == 0) 845 && (strcmp(url->pwd, cached_host.pwd) == 0) 846 && (url->port == cached_host.port)); 847} 848 849/* 850 * Check the cache, reconnect if no luck 851 */ 852static int 853_ftp_cached_connect(struct url *url, struct url *purl, const char *flags) 854{ 855 int e, cd; 856 857 cd = -1; 858 859 /* set default port */ 860 if (!url->port) 861 url->port = _fetch_default_port(url->scheme); 862 863 /* try to use previously cached connection */ 864 if (_ftp_isconnected(url)) { 865 e = _ftp_cmd(cached_socket, "NOOP"); 866 if (e == FTP_OK || e == FTP_SYNTAX_ERROR) 867 return cached_socket; 868 } 869 870 /* connect to server */ 871 if ((cd = _ftp_connect(url, purl, flags)) == -1) 872 return -1; 873 if (cached_socket) 874 _ftp_disconnect(cached_socket); 875 cached_socket = cd; 876 memcpy(&cached_host, url, sizeof *url); 877 return cd; 878} 879 880/* 881 * Check the proxy settings 882 */ 883static struct url * 884_ftp_get_proxy(void) 885{ 886 struct url *purl; 887 char *p; 888 889 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || 890 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 891 *p && (purl = fetchParseURL(p)) != NULL) { 892 if (!*purl->scheme) { 893 if (getenv("FTP_PROXY") || getenv("ftp_proxy")) 894 strcpy(purl->scheme, SCHEME_FTP); 895 else 896 strcpy(purl->scheme, SCHEME_HTTP); 897 } 898 if (!purl->port) 899 purl->port = _fetch_default_proxy_port(purl->scheme); 900 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || 901 strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 902 return purl; 903 fetchFreeURL(purl); 904 } 905 return NULL; 906} 907 908/* 909 * Process an FTP request 910 */ 911FILE * 912_ftp_request(struct url *url, const char *op, struct url_stat *us, 913 struct url *purl, const char *flags) 914{ 915 int cd; 916 917 /* check if we should use HTTP instead */ 918 if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { 919 if (strcmp(op, "STAT") == 0) 920 return _http_request(url, "HEAD", us, purl, flags); 921 else if (strcmp(op, "RETR") == 0) 922 return _http_request(url, "GET", us, purl, flags); 923 /* 924 * Our HTTP code doesn't support PUT requests yet, so try a 925 * direct connection. 926 */ 927 } 928 929 /* connect to server */ 930 cd = _ftp_cached_connect(url, purl, flags); 931 if (purl) 932 fetchFreeURL(purl); 933 if (cd == NULL) 934 return NULL; 935 936 /* change directory */ 937 if (_ftp_cwd(cd, url->doc) == -1) 938 return NULL; 939 940 /* stat file */ 941 if (us && _ftp_stat(cd, url->doc, us) == -1 942 && fetchLastErrCode != FETCH_PROTO 943 && fetchLastErrCode != FETCH_UNAVAIL) 944 return NULL; 945 946 /* just a stat */ 947 if (strcmp(op, "STAT") == 0) 948 return (FILE *)1; /* bogus return value */ 949 950 /* initiate the transfer */ 951 return _ftp_transfer(cd, op, url->doc, O_RDONLY, url->offset, flags); 952} 953 954/* 955 * Get and stat file 956 */ 957FILE * 958fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) 959{ 960 return _ftp_request(url, "RETR", us, _ftp_get_proxy(), flags); 961} 962 963/* 964 * Get file 965 */ 966FILE * 967fetchGetFTP(struct url *url, const char *flags) 968{ 969 return fetchXGetFTP(url, NULL, flags); 970} 971 972/* 973 * Put file 974 */ 975FILE * 976fetchPutFTP(struct url *url, const char *flags) 977{ 978 979 return _ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, 980 _ftp_get_proxy(), flags); 981} 982 983/* 984 * Get file stats 985 */ 986int 987fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) 988{ 989 990 if (_ftp_request(url, "STAT", us, _ftp_get_proxy(), flags) == NULL) 991 return -1; 992 return 0; 993} 994 995/* 996 * List a directory 997 */ 998struct url_ent * 999fetchListFTP(struct url *url __unused, const char *flags __unused) 1000{ 1001 warnx("fetchListFTP(): not implemented"); 1002 return NULL; 1003} 1004