/*- * Copyright (c) 1998 Dag-Erling Coïdan Smørgrav * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer * in this position and unchanged. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD: head/lib/libfetch/ftp.c 64883 2000-08-21 07:18:31Z des $ */ /* * Portions of this code were taken from or based on ftpio.c: * * ---------------------------------------------------------------------------- * "THE BEER-WARE LICENSE" (Revision 42): * wrote this file. As long as you retain this notice you * can do whatever you want with this stuff. If we meet some day, and you think * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp * ---------------------------------------------------------------------------- * * Major Changelog: * * Dag-Erling Coïdan Smørgrav * 9 Jun 1998 * * Incorporated into libfetch * * Jordan K. Hubbard * 17 Jan 1996 * * Turned inside out. Now returns xfers as new file ids, not as a special * `state' of FTP_t * * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $ * */ #include #include #include #include #include #include #include #include #include #include #include #include #include "fetch.h" #include "common.h" #include "ftperr.h" #define FTP_ANONYMOUS_USER "ftp" #define FTP_ANONYMOUS_PASSWORD "ftp" #define FTP_CONNECTION_ALREADY_OPEN 125 #define FTP_OPEN_DATA_CONNECTION 150 #define FTP_OK 200 #define FTP_FILE_STATUS 213 #define FTP_SERVICE_READY 220 #define FTP_PASSIVE_MODE 227 #define FTP_LPASSIVE_MODE 228 #define FTP_EPASSIVE_MODE 229 #define FTP_LOGGED_IN 230 #define FTP_FILE_ACTION_OK 250 #define FTP_NEED_PASSWORD 331 #define FTP_NEED_ACCOUNT 332 #define FTP_FILE_OK 350 #define FTP_SYNTAX_ERROR 500 #define FTP_PROTOCOL_ERROR 999 static struct url cached_host; static int cached_socket; static char *last_reply; static size_t lr_size, lr_length; static int last_code; #define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ && isdigit(foo[2]) \ && (foo[3] == ' ' || foo[3] == '\0')) #define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \ && isdigit(foo[2]) && foo[3] == '-') /* translate IPv4 mapped IPv6 address to IPv4 address */ static void unmappedaddr(struct sockaddr_in6 *sin6) { struct sockaddr_in *sin4; u_int32_t addr; int port; if (sin6->sin6_family != AF_INET6 || !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) return; sin4 = (struct sockaddr_in *)sin6; addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12]; port = sin6->sin6_port; memset(sin4, 0, sizeof(struct sockaddr_in)); sin4->sin_addr.s_addr = addr; sin4->sin_port = port; sin4->sin_family = AF_INET; sin4->sin_len = sizeof(struct sockaddr_in); } /* * Get server response */ static int _ftp_chkerr(int cd) { if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { _fetch_syserr(); return -1; } if (isftpinfo(last_reply)) { while (!isftpreply(last_reply)) { if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) { _fetch_syserr(); return -1; } } } while (lr_length && isspace(last_reply[lr_length-1])) lr_length--; last_reply[lr_length] = 0; if (!isftpreply(last_reply)) { _ftp_seterr(FTP_PROTOCOL_ERROR); return -1; } last_code = (last_reply[0] - '0') * 100 + (last_reply[1] - '0') * 10 + (last_reply[2] - '0'); return last_code; } /* * Send a command and check reply */ static int _ftp_cmd(int cd, char *fmt, ...) { va_list ap; size_t len; char *msg; int r; va_start(ap, fmt); len = vasprintf(&msg, fmt, ap); va_end(ap); if (msg == NULL) { errno = ENOMEM; _fetch_syserr(); return -1; } r = _fetch_putln(cd, msg, len); free(msg); if (r == -1) { _fetch_syserr(); return -1; } return _ftp_chkerr(cd); } /* * Return a pointer to the filename part of a path */ static char * _ftp_filename(char *file) { char *s; if ((s = strrchr(file, '/')) == NULL) return file; else return s + 1; } /* * Change working directory to the directory that contains the * specified file. */ static int _ftp_cwd(int cd, char *file) { char *s; int e; if ((s = strrchr(file, '/')) == NULL || s == file) { e = _ftp_cmd(cd, "CWD /"); } else { e = _ftp_cmd(cd, "CWD %.*s", s - file, file); } if (e != FTP_FILE_ACTION_OK) { _ftp_seterr(e); return -1; } return 0; } /* * Request and parse file stats */ static int _ftp_stat(int cd, char *file, struct url_stat *us) { char *ln, *s; struct tm tm; time_t t; int e; us->size = -1; us->atime = us->mtime = 0; if ((s = strrchr(file, '/')) == NULL) s = file; else ++s; if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) { _ftp_seterr(e); return -1; } for (ln = last_reply + 4; *ln && isspace(*ln); ln++) /* nothing */ ; for (us->size = 0; *ln && isdigit(*ln); ln++) us->size = us->size * 10 + *ln - '0'; if (*ln && !isspace(*ln)) { _ftp_seterr(FTP_PROTOCOL_ERROR); return -1; } if (us->size == 0) us->size = -1; DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size)); if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) { _ftp_seterr(e); return -1; } for (ln = last_reply + 4; *ln && isspace(*ln); ln++) /* nothing */ ; switch (strspn(ln, "0123456789")) { case 14: break; case 15: ln++; ln[0] = '2'; ln[1] = '0'; break; default: _ftp_seterr(FTP_PROTOCOL_ERROR); return -1; } if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { _ftp_seterr(FTP_PROTOCOL_ERROR); return -1; } tm.tm_mon--; tm.tm_year -= 1900; tm.tm_isdst = -1; t = timegm(&tm); if (t == (time_t)-1) t = time(NULL); us->mtime = t; us->atime = t; DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d " "%02d:%02d:%02d\033[m]\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec)); return 0; } /* * Transfer file */ static FILE * _ftp_transfer(int cd, char *oper, char *file, char *mode, off_t offset, char *flags) { struct sockaddr_storage sin; struct sockaddr_in6 *sin6; struct sockaddr_in *sin4; int pasv, high, verbose; int e, sd = -1; socklen_t l; char *s; FILE *df; /* check flags */ pasv = (flags && strchr(flags, 'p')); high = (flags && strchr(flags, 'h')); verbose = (flags && strchr(flags, 'v')); /* passive mode */ if (!pasv && (s = getenv("FTP_PASSIVE_MODE")) != NULL) pasv = (strncasecmp(s, "no", 2) != 0); /* find our own address, bind, and listen */ l = sizeof sin; if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1) goto sysouch; if (sin.ss_family == AF_INET6) unmappedaddr((struct sockaddr_in6 *)&sin); /* open data socket */ if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { _fetch_syserr(); return NULL; } if (pasv) { u_char addr[64]; char *ln, *p; int i; int port; /* send PASV command */ if (verbose) _fetch_info("setting passive mode"); switch (sin.ss_family) { case AF_INET: if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE) goto ouch; break; case AF_INET6: if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) { if (e == -1) goto ouch; if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE) goto ouch; } break; default: e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ goto ouch; } /* * Find address and port number. The reply to the PASV command * is IMHO the one and only weak point in the FTP protocol. */ ln = last_reply; switch (e) { case FTP_PASSIVE_MODE: case FTP_LPASSIVE_MODE: for (p = ln + 3; *p && !isdigit(*p); p++) /* nothing */ ; if (!*p) { e = FTP_PROTOCOL_ERROR; goto ouch; } l = (e == FTP_PASSIVE_MODE ? 6 : 21); for (i = 0; *p && i < l; i++, p++) addr[i] = strtol(p, &p, 10); if (i < l) { e = FTP_PROTOCOL_ERROR; goto ouch; } break; case FTP_EPASSIVE_MODE: for (p = ln + 3; *p && *p != '('; p++) /* nothing */ ; if (!*p) { e = FTP_PROTOCOL_ERROR; goto ouch; } ++p; if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], &port, &addr[3]) != 5 || addr[0] != addr[1] || addr[0] != addr[2] || addr[0] != addr[3]) { e = FTP_PROTOCOL_ERROR; goto ouch; } break; } /* seek to required offset */ if (offset) if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK) goto sysouch; /* construct sockaddr for data socket */ l = sizeof sin; if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1) goto sysouch; if (sin.ss_family == AF_INET6) unmappedaddr((struct sockaddr_in6 *)&sin); switch (sin.ss_family) { case AF_INET6: sin6 = (struct sockaddr_in6 *)&sin; if (e == FTP_EPASSIVE_MODE) sin6->sin6_port = htons(port); else { bcopy(addr + 2, (char *)&sin6->sin6_addr, 16); bcopy(addr + 19, (char *)&sin6->sin6_port, 2); } break; case AF_INET: sin4 = (struct sockaddr_in *)&sin; if (e == FTP_EPASSIVE_MODE) sin4->sin_port = htons(port); else { bcopy(addr, (char *)&sin4->sin_addr, 4); bcopy(addr + 4, (char *)&sin4->sin_port, 2); } break; default: e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ break; } /* connect to data port */ if (verbose) _fetch_info("opening data connection"); if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1) goto sysouch; /* make the server initiate the transfer */ if (verbose) _fetch_info("initiating transfer"); e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file)); if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) goto ouch; } else { u_int32_t a; u_short p; int arg, d; char *ap; char hname[INET6_ADDRSTRLEN]; switch (sin.ss_family) { case AF_INET6: ((struct sockaddr_in6 *)&sin)->sin6_port = 0; #ifdef IPV6_PORTRANGE arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT; if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, (char *)&arg, sizeof(arg)) == -1) goto sysouch; #endif break; case AF_INET: ((struct sockaddr_in *)&sin)->sin_port = 0; arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, (char *)&arg, sizeof arg) == -1) goto sysouch; break; } if (verbose) _fetch_info("binding data socket"); if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1) goto sysouch; if (listen(sd, 1) == -1) goto sysouch; /* find what port we're on and tell the server */ if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1) goto sysouch; switch (sin.ss_family) { case AF_INET: sin4 = (struct sockaddr_in *)&sin; a = ntohl(sin4->sin_addr.s_addr); p = ntohs(sin4->sin_port); e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d", (a >> 24) & 0xff, (a >> 16) & 0xff, (a >> 8) & 0xff, a & 0xff, (p >> 8) & 0xff, p & 0xff); break; case AF_INET6: #define UC(b) (((int)b)&0xff) e = -1; sin6 = (struct sockaddr_in6 *)&sin; if (getnameinfo((struct sockaddr *)&sin, sin.ss_len, hname, sizeof(hname), NULL, 0, NI_NUMERICHOST) == 0) { e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname, htons(sin6->sin6_port)); if (e == -1) goto ouch; } if (e != FTP_OK) { ap = (char *)&sin6->sin6_addr; e = _ftp_cmd(cd, "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 6, 16, UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 2, (ntohs(sin6->sin6_port) >> 8) & 0xff, ntohs(sin6->sin6_port) & 0xff); } break; default: e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ goto ouch; } if (e != FTP_OK) goto ouch; /* seek to required offset */ if (offset) if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK) goto sysouch; /* make the server initiate the transfer */ if (verbose) _fetch_info("initiating transfer"); e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file)); if (e != FTP_OPEN_DATA_CONNECTION) goto ouch; /* accept the incoming connection and go to town */ if ((d = accept(sd, NULL, NULL)) == -1) goto sysouch; close(sd); sd = d; } if ((df = fdopen(sd, mode)) == NULL) goto sysouch; return df; sysouch: _fetch_syserr(); if (sd >= 0) close(sd); return NULL; ouch: if (e != -1) _ftp_seterr(e); if (sd >= 0) close(sd); return NULL; } /* * Return default port */ static int _ftp_default_port(void) { struct servent *se; if ((se = getservbyname("ftp", "tcp")) != NULL) return ntohs(se->s_port); return FTP_DEFAULT_PORT; } /* * Log on to FTP server */ static int _ftp_connect(char *host, int port, char *user, char *pwd, char *flags) { int cd, e, pp = 0, direct, verbose; #ifdef INET6 int af = AF_UNSPEC; #else int af = AF_INET; #endif char *p, *q; const char *logname; char localhost[MAXHOSTNAMELEN]; char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; direct = (flags && strchr(flags, 'd')); verbose = (flags && strchr(flags, 'v')); if ((flags && strchr(flags, '4'))) af = AF_INET; else if ((flags && strchr(flags, '6'))) af = AF_INET6; /* check for proxy */ if (!direct && (p = getenv("FTP_PROXY")) != NULL && *p) { char c = 0; #ifdef INET6 if (*p != '[' || (q = strchr(p + 1, ']')) == NULL || (*++q != '\0' && *q != ':')) #endif q = strchr(p, ':'); if (q != NULL && *q == ':') { if (strspn(q+1, "0123456789") != strlen(q+1) || strlen(q+1) > 5) { /* XXX we should emit some kind of warning */ } pp = atoi(q+1); if (pp < 1 || pp > 65535) { /* XXX we should emit some kind of warning */ } } if (!pp) pp = _ftp_default_port(); if (q) { #ifdef INET6 if (q > p && *p == '[' && *(q - 1) == ']') { p++; q--; } #endif c = *q; *q = 0; } cd = _fetch_connect(p, pp, af, verbose); if (q) *q = c; } else { /* no proxy, go straight to target */ cd = _fetch_connect(host, port, af, verbose); p = NULL; } /* check connection */ if (cd == -1) { _fetch_syserr(); return NULL; } /* expect welcome message */ if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY) goto fouch; /* send user name and password */ if (!user || !*user) user = FTP_ANONYMOUS_USER; if (p && port == FTP_DEFAULT_PORT) e = _ftp_cmd(cd, "USER %s@%s", user, host); else if (p) e = _ftp_cmd(cd, "USER %s@%s@%d", user, host, port); else e = _ftp_cmd(cd, "USER %s", user); /* did the server request a password? */ if (e == FTP_NEED_PASSWORD) { if (!pwd || !*pwd) pwd = getenv("FTP_PASSWORD"); if (!pwd || !*pwd) { if ((logname = getlogin()) == 0) logname = FTP_ANONYMOUS_PASSWORD; gethostname(localhost, sizeof localhost); snprintf(pbuf, sizeof pbuf, "%s@%s", logname, localhost); pwd = pbuf; } e = _ftp_cmd(cd, "PASS %s", pwd); } /* did the server request an account? */ if (e == FTP_NEED_ACCOUNT) goto fouch; /* we should be done by now */ if (e != FTP_LOGGED_IN) goto fouch; /* might as well select mode and type at once */ #ifdef FTP_FORCE_STREAM_MODE if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */ goto fouch; #endif if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */ goto fouch; /* done */ return cd; fouch: if (e != -1) _ftp_seterr(e); close(cd); return NULL; } /* * Disconnect from server */ static void _ftp_disconnect(int cd) { (void)_ftp_cmd(cd, "QUIT"); close(cd); } /* * Check if we're already connected */ static int _ftp_isconnected(struct url *url) { return (cached_socket && (strcmp(url->host, cached_host.host) == 0) && (strcmp(url->user, cached_host.user) == 0) && (strcmp(url->pwd, cached_host.pwd) == 0) && (url->port == cached_host.port)); } /* * Check the cache, reconnect if no luck */ static int _ftp_cached_connect(struct url *url, char *flags) { int e, cd; cd = -1; /* set default port */ if (!url->port) url->port = _ftp_default_port(); /* try to use previously cached connection */ if (_ftp_isconnected(url)) { e = _ftp_cmd(cached_socket, "NOOP"); if (e == FTP_OK || e == FTP_SYNTAX_ERROR) cd = cached_socket; } /* connect to server */ if (cd == -1) { cd = _ftp_connect(url->host, url->port, url->user, url->pwd, flags); if (cd == -1) return -1; if (cached_socket) _ftp_disconnect(cached_socket); cached_socket = cd; memcpy(&cached_host, url, sizeof *url); } return cd; } /* * Check to see if we should use an HTTP proxy instead */ static int _ftp_use_http_proxy(void) { char *p; return ((p = getenv("HTTP_PROXY")) && *p && !getenv("FTP_PROXY")); } /* * Get and stat file */ FILE * fetchXGetFTP(struct url *url, struct url_stat *us, char *flags) { int cd; if (_ftp_use_http_proxy()) return fetchXGetHTTP(url, us, flags); /* connect to server */ if ((cd = _ftp_cached_connect(url, flags)) == NULL) return NULL; /* change directory */ if (_ftp_cwd(cd, url->doc) == -1) return NULL; /* stat file */ if (us && _ftp_stat(cd, url->doc, us) == -1 && fetchLastErrCode != FETCH_PROTO && fetchLastErrCode != FETCH_UNAVAIL) return NULL; /* initiate the transfer */ return _ftp_transfer(cd, "RETR", url->doc, "r", url->offset, flags); } /* * Get file */ FILE * fetchGetFTP(struct url *url, char *flags) { return fetchXGetFTP(url, NULL, flags); } /* * Put file */ FILE * fetchPutFTP(struct url *url, char *flags) { int cd; if (_ftp_use_http_proxy()) return fetchPutHTTP(url, flags); /* connect to server */ if ((cd = _ftp_cached_connect(url, flags)) == NULL) return NULL; /* change directory */ if (_ftp_cwd(cd, url->doc) == -1) return NULL; /* initiate the transfer */ return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR", url->doc, "w", url->offset, flags); } /* * Get file stats */ int fetchStatFTP(struct url *url, struct url_stat *us, char *flags) { int cd; if (_ftp_use_http_proxy()) return fetchStatHTTP(url, us, flags); /* connect to server */ if ((cd = _ftp_cached_connect(url, flags)) == NULL) return -1; /* change directory */ if (_ftp_cwd(cd, url->doc) == -1) return -1; /* stat file */ return _ftp_stat(cd, url->doc, us); } /* * List a directory */ extern void warnx(char *, ...); struct url_ent * fetchListFTP(struct url *url, char *flags) { if (_ftp_use_http_proxy()) return fetchListHTTP(url, flags); warnx("fetchListFTP(): not implemented"); return NULL; }