/*- * Copyright (c) 1998-2004 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. */ #include "free2net.h" #include __FBSDID("$FreeBSD: src/lib/libfetch/ftp.c,v 1.91.2.2 2007/05/16 07:04:02 njl Exp $"); /* * 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 #include #include #include "fetch.h" #include "common.h" #include "ftperr.h" #define FTP_ANONYMOUS_USER "anonymous" #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_TRANSFER_COMPLETE 226 #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_DIRECTORY_CREATED 257 /* multiple meanings */ #define FTP_FILE_CREATED 257 /* multiple meanings */ #define FTP_WORKING_DIRECTORY 257 /* multiple meanings */ #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 conn_t *cached_connection; #define isftpreply(foo) (isdigit((unsigned)foo[0]) && \ isdigit((unsigned)foo[1]) && \ isdigit((unsigned)foo[2]) && \ (foo[3] == ' ' || foo[3] == '\0')) #define isftpinfo(foo) (isdigit((unsigned)foo[0]) && \ isdigit((unsigned)foo[1]) && \ isdigit((unsigned)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 *)(void *)sin6; addr = *(u_int32_t *)(void *)&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(conn_t *conn) { if (_fetch_getln(conn) == -1) { _fetch_syserr(); return (-1); } if (isftpinfo(conn->buf)) { while (conn->buflen && !isftpreply(conn->buf)) { if (_fetch_getln(conn) == -1) { _fetch_syserr(); return (-1); } } } while (conn->buflen && isspace((unsigned)conn->buf[conn->buflen - 1])) conn->buflen--; conn->buf[conn->buflen] = '\0'; if (!isftpreply(conn->buf)) { _ftp_seterr(FTP_PROTOCOL_ERROR); return (-1); } conn->err = (conn->buf[0] - '0') * 100 + (conn->buf[1] - '0') * 10 + (conn->buf[2] - '0'); return (conn->err); } /* * Send a command and check reply */ static int _ftp_cmd(conn_t *conn, const 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(conn, msg, len); free(msg); if (r == -1) { _fetch_syserr(); return (-1); } return (_ftp_chkerr(conn)); } /* * Return a pointer to the filename part of a path */ static const char * _ftp_filename(const char *file, int *len, int *type) { const char *s; if ((s = strrchr(file, '/')) == NULL) s = file; else s = s + 1; *len = strlen(s); if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { *type = s[*len - 1]; *len -= 7; } else { *type = '\0'; } return (s); } /* * Get current working directory from the reply to a CWD, PWD or CDUP * command. */ static int _ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) { char *src, *dst, *end; int q; if (conn->err != FTP_WORKING_DIRECTORY && conn->err != FTP_FILE_ACTION_OK) return (FTP_PROTOCOL_ERROR); end = conn->buf + conn->buflen; src = conn->buf + 4; if (src >= end || *src++ != '"') return (FTP_PROTOCOL_ERROR); for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { if (!q && *src == '"') q = 1; else if (q && *src != '"') break; else if (q) *dst++ = '"', q = 0; else *dst++ = *src; } if (!pwdlen) return (FTP_PROTOCOL_ERROR); *dst = '\0'; #if 0 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); #endif return (FTP_OK); } /* * Change working directory to the directory that contains the specified * file. */ static int _ftp_cwd(conn_t *conn, const char *file) { const char *beg, *end; char pwd[PATH_MAX]; int e, i, len; /* If no slashes in name, no need to change dirs. */ if ((end = strrchr(file, '/')) == NULL) return (0); if ((e = _ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || (e = _ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { _ftp_seterr(e); return (-1); } for (;;) { len = strlen(pwd); /* Look for a common prefix between PWD and dir to fetch. */ for (i = 0; i <= len && i <= end - file; ++i) if (pwd[i] != file[i]) break; #if 0 DEBUG(fprintf(stderr, "have: [%.*s|%s]\n", i, pwd, pwd + i)); DEBUG(fprintf(stderr, "want: [%.*s|%s]\n", i, file, file + i)); #endif /* Keep going up a dir until we have a matching prefix. */ if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) break; if ((e = _ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || (e = _ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || (e = _ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { _ftp_seterr(e); return (-1); } } #ifdef FTP_COMBINE_CWDS /* Skip leading slashes, even "////". */ for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) /* nothing */ ; /* If there is no trailing dir, we're already there. */ if (beg >= end) return (0); /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ e = _ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); if (e == FTP_FILE_ACTION_OK) return (0); #endif /* FTP_COMBINE_CWDS */ /* That didn't work so go back to legacy behavior (multiple CWDs). */ for (beg = file + i; beg < end; beg = file + i + 1) { while (*beg == '/') ++beg, ++i; for (++i; file + i < end && file[i] != '/'; ++i) /* nothing */ ; e = _ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); if (e != FTP_FILE_ACTION_OK) { _ftp_seterr(e); return (-1); } } return (0); } /* * Set transfer mode and data type */ static int _ftp_mode_type(conn_t *conn, int mode, int type) { int e; switch (mode) { case 0: case 's': mode = 'S'; /* FALLTHROUGH */ case 'S': break; default: return (FTP_PROTOCOL_ERROR); } if ((e = _ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { if (mode == 'S') { /* * Stream mode is supposed to be the default - so * much so that some servers not only do not * support any other mode, but do not support the * MODE command at all. * * If "MODE S" fails, it is unlikely that we * previously succeeded in setting a different * mode. Therefore, we simply hope that the * server is already in the correct mode, and * silently ignore the failure. */ } else { return (e); } } switch (type) { case 0: case 'i': type = 'I'; /* FALLTHROUGH */ case 'I': break; case 'a': type = 'A'; /* FALLTHROUGH */ case 'A': break; case 'd': type = 'D'; /* FALLTHROUGH */ case 'D': /* can't handle yet */ default: return (FTP_PROTOCOL_ERROR); } if ((e = _ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) return (e); return (FTP_OK); } /* * Request and parse file stats */ static int _ftp_stat(conn_t *conn, const char *file, struct url_stat *us) { char *ln; const char *filename; int filenamelen, type; struct tm tm; time_t t; int e; us->size = -1; us->atime = us->mtime = 0; filename = _ftp_filename(file, &filenamelen, &type); if ((e = _ftp_mode_type(conn, 0, type)) != FTP_OK) { _ftp_seterr(e); return (-1); } e = _ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); if (e != FTP_FILE_STATUS) { _ftp_seterr(e); return (-1); } for (ln = conn->buf + 4; *ln && isspace((unsigned)*ln); ln++) /* nothing */ ; for (us->size = 0; *ln && isdigit((unsigned)*ln); ln++) us->size = us->size * 10 + *ln - '0'; if (*ln && !isspace((unsigned)*ln)) { _ftp_seterr(FTP_PROTOCOL_ERROR); us->size = -1; return (-1); } if (us->size == 0) us->size = -1; DEBUG(fprintf(stderr, "size: [%lld]\n", (long long)us->size)); e = _ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); if (e != FTP_FILE_STATUS) { _ftp_seterr(e); return (-1); } for (ln = conn->buf + 4; *ln && isspace((unsigned)*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: [%04d-%02d-%02d %02d:%02d:%02d]\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec)); return (0); } /* * I/O functions for FTP */ struct ftpio { conn_t *cconn; /* Control connection */ conn_t *dconn; /* Data connection */ int dir; /* Direction */ int eof; /* EOF reached */ int err; /* Error code */ }; static int _ftp_readfn(void *, char *, int); static int _ftp_writefn(void *, const char *, int); static fpos_t _ftp_seekfn(void *, fpos_t, int); static int _ftp_closefn(void *); static int _ftp_readfn(void *v, char *buf, int len) { struct ftpio *io; int r; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return (-1); } if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { errno = EBADF; return (-1); } if (io->err) { errno = io->err; return (-1); } if (io->eof) return (0); r = _fetch_read(io->dconn, buf, (unsigned)len); if (r > 0) return (r); if (r == 0) { io->eof = 1; return (0); } if (errno != EINTR) io->err = errno; return (-1); } static int _ftp_writefn(void *v, const char *buf, int len) { struct ftpio *io; int w; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return (-1); } if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { errno = EBADF; return (-1); } if (io->err) { errno = io->err; return (-1); } w = _fetch_write(io->dconn, buf, (unsigned)len); if (w >= 0) return (w); if (errno != EINTR) io->err = errno; return (-1); } /* ARGSUSED1 */ static fpos_t _ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) { struct ftpio *io; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return (-1); } errno = ESPIPE; return (-1); } static int _ftp_closefn(void *v) { struct ftpio *io; int r; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return (-1); } if (io->dir == -1) return (0); if (io->cconn == NULL || io->dconn == NULL) { errno = EBADF; return (-1); } _fetch_close(io->dconn); io->dir = -1; io->dconn = NULL; DEBUG(fprintf(stderr, "Waiting for final status\n")); r = _ftp_chkerr(io->cconn); if (io->cconn == cached_connection && io->cconn->ref == 1) cached_connection = NULL; _fetch_close(io->cconn); free(io); return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; } static FILE * _ftp_setup(conn_t *cconn, conn_t *dconn, int mode) { struct ftpio *io; FILE *f; if (cconn == NULL || dconn == NULL) return (NULL); if ((io = malloc(sizeof(*io))) == NULL) return (NULL); io->cconn = cconn; io->dconn = dconn; io->dir = mode; io->eof = io->err = 0; f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn); if (f == NULL) free(io); return (f); } /* * Transfer file */ static FILE * _ftp_transfer(conn_t *conn, const char *oper, const char *file, int mode, off_t offset, const char *flags) { struct sockaddr_storage sa; struct sockaddr_in6 *sin6; struct sockaddr_in *sin4; const char *bindaddr; const char *filename; int filenamelen, type; int low, pasv, verbose; int e, sd = -1; socklen_t l; char *s; FILE *df; /* check flags */ low = CHECK_FLAG('l'); pasv = CHECK_FLAG('p'); verbose = CHECK_FLAG('v'); /* passive mode */ if (!pasv) pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL && strncasecmp(s, "no", 2) != 0); /* isolate filename */ filename = _ftp_filename(file, &filenamelen, &type); /* set transfer mode and data type */ if ((e = _ftp_mode_type(conn, 0, type)) != FTP_OK) goto ouch; /* find our own address, bind, and listen */ l = sizeof(sa); if (getsockname(conn->sd, (struct sockaddr *)(void *)&sa, &l) == -1) goto sysouch; if (sa.ss_family == AF_INET6) unmappedaddr((struct sockaddr_in6 *)(void *)&sa); /* open data socket */ if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { _fetch_syserr(); return (NULL); } if (pasv) { u_char addr[64]; char *ln, *p; unsigned int i; int port; /* send PASV command */ if (verbose) _fetch_info("setting passive mode"); switch (sa.ss_family) { case AF_INET: if ((e = _ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) goto ouch; break; case AF_INET6: if ((e = _ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { if (e == -1) goto ouch; if ((e = _ftp_cmd(conn, "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 = conn->buf; switch (e) { case FTP_PASSIVE_MODE: case FTP_LPASSIVE_MODE: for (p = ln + 3; *p && !isdigit((unsigned)*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] = (unsigned char) 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(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) goto sysouch; /* construct sockaddr for data socket */ l = sizeof(sa); if (getpeername(conn->sd, (struct sockaddr *)(void *)&sa, &l) == -1) goto sysouch; if (sa.ss_family == AF_INET6) unmappedaddr((struct sockaddr_in6 *)(void *)&sa); switch (sa.ss_family) { case AF_INET6: sin6 = (struct sockaddr_in6 *)(void *)&sa; if (e == FTP_EPASSIVE_MODE) sin6->sin6_port = htons(port); else { bcopy(addr + 2, (char *)(void *)&sin6->sin6_addr, 16); bcopy(addr + 19, (char *)(void *)&sin6->sin6_port, 2); } break; case AF_INET: sin4 = (struct sockaddr_in *)(void *)&sa; if (e == FTP_EPASSIVE_MODE) sin4->sin_port = htons(port); else { bcopy(addr, (char *)(void *)&sin4->sin_addr, 4); bcopy(addr + 4, (char *)(void *)&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"); bindaddr = getenv("FETCH_BIND_ADDRESS"); if (bindaddr != NULL && *bindaddr != '\0' && _fetch_bind(sd, sa.ss_family, bindaddr) != 0) goto sysouch; if (connect(sd, (struct sockaddr *)(void *)&sa, (unsigned)sa.ss_len) == -1) goto sysouch; /* make the server initiate the transfer */ if (verbose) _fetch_info("initiating transfer"); e = _ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); 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 (sa.ss_family) { case AF_INET6: ((struct sockaddr_in6 *)(void *)&sa)->sin6_port = 0; #ifdef IPV6_PORTRANGE arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, (char *)(void *)&arg, sizeof(arg)) == -1) goto sysouch; #endif break; case AF_INET: ((struct sockaddr_in *)(void *)&sa)->sin_port = 0; arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, (char *)(void *)&arg, sizeof(arg)) == -1) goto sysouch; break; } if (verbose) _fetch_info("binding data socket"); if (bind(sd, (struct sockaddr *)(void *)&sa, (unsigned) sa.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 *)(void *)&sa, &l) == -1) goto sysouch; switch (sa.ss_family) { case AF_INET: sin4 = (struct sockaddr_in *)(void *)&sa; a = ntohl(sin4->sin_addr.s_addr); p = ntohs(sin4->sin_port); e = _ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", (a >> 24) & 0xff, (a >> 16) & 0xff, (a >> 8) & 0xff, a & 0xff, ((unsigned)p >> 8) & 0xff, p & 0xff); break; case AF_INET6: #define UC(b) (((int)b)&0xff) e = -1; sin6 = (struct sockaddr_in6 *)(void *)&sa; sin6->sin6_scope_id = 0; if (getnameinfo((struct sockaddr *)(void *)&sa, (unsigned)sa.ss_len, hname, sizeof(hname), NULL, 0, NI_NUMERICHOST) == 0) { e = _ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, htons(sin6->sin6_port)); if (e == -1) goto ouch; } if (e != FTP_OK) { ap = (char *)(void *)&sin6->sin6_addr; e = _ftp_cmd(conn, "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, ((unsigned)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(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) goto sysouch; /* make the server initiate the transfer */ if (verbose) _fetch_info("initiating transfer"); e = _ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); if (e != FTP_CONNECTION_ALREADY_OPEN && 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 = _ftp_setup(conn, _fetch_reopen(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); } /* * Authenticate */ static int _ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) { const char *user, *pwd, *logname; char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; int e, len; /* XXX FTP_AUTH, and maybe .netrc */ /* send user name and password */ if (url->user[0] == '\0') _fetch_netrc_auth(url); user = url->user; if (*user == '\0') user = getenv("FTP_LOGIN"); if (user == NULL || *user == '\0') user = FTP_ANONYMOUS_USER; if (purl && url->port == _fetch_default_port(url->scheme)) e = _ftp_cmd(conn, "USER %s@%s", user, url->host); else if (purl) e = _ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); else e = _ftp_cmd(conn, "USER %s", user); /* did the server request a password? */ if (e == FTP_NEED_PASSWORD) { pwd = url->pwd; if (*pwd == '\0') pwd = getenv("FTP_PASSWORD"); if (pwd == NULL || *pwd == '\0') { if ((logname = getlogin()) == 0) logname = FTP_ANONYMOUS_USER; if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) len = 0; else if (len > MAXLOGNAME) len = MAXLOGNAME; gethostname(pbuf + len, sizeof(pbuf) - len); pwd = pbuf; } e = _ftp_cmd(conn, "PASS %s", pwd); } return (e); } /* * Log on to FTP server */ static conn_t * _ftp_connect(struct url *url, struct url *purl, const char *flags) { conn_t *conn; int e, direct, verbose; #ifdef INET6 int af = AF_UNSPEC; #else int af = AF_INET; #endif direct = CHECK_FLAG('d'); verbose = CHECK_FLAG('v'); if (CHECK_FLAG('4')) af = AF_INET; else if (CHECK_FLAG('6')) af = AF_INET6; if (direct) purl = NULL; /* check for proxy */ if (purl) { /* XXX proxy authentication! */ conn = _fetch_connect(purl->host, purl->port, af, verbose); } else { /* no proxy, go straight to target */ conn = _fetch_connect(url->host, url->port, af, verbose); purl = NULL; } /* check connection */ if (conn == NULL) /* _fetch_connect() has already set an error code */ return (NULL); /* expect welcome message */ if ((e = _ftp_chkerr(conn)) != FTP_SERVICE_READY) goto fouch; /* authenticate */ if ((e = _ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) goto fouch; /* TODO: Request extended features supported, if any (RFC 3659). */ /* done */ return (conn); fouch: if (e != -1) _ftp_seterr(e); _fetch_close(conn); return (NULL); } /* * Disconnect from server */ static void _ftp_disconnect(conn_t *conn) { (void)_ftp_cmd(conn, "QUIT"); if (conn == cached_connection && conn->ref == 1) cached_connection = NULL; _fetch_close(conn); } /* * Check if we're already connected */ static int _ftp_isconnected(struct url *url) { return (cached_connection && (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 conn_t * _ftp_cached_connect(struct url *url, struct url *purl, const char *flags) { conn_t *conn; int e; /* set default port */ if (!url->port) url->port = _fetch_default_port(url->scheme); /* try to use previously cached connection */ if (_ftp_isconnected(url)) { e = _ftp_cmd(cached_connection, "NOOP"); if (e == FTP_OK || e == FTP_SYNTAX_ERROR) return (_fetch_ref(cached_connection)); } /* connect to server */ if ((conn = _ftp_connect(url, purl, flags)) == NULL) return (NULL); if (cached_connection) _ftp_disconnect(cached_connection); cached_connection = _fetch_ref(conn); memcpy(&cached_host, url, sizeof(*url)); return (conn); } /* * Check the proxy settings */ static struct url * _ftp_get_proxy(const char *flags) { struct url *purl; char *p; if (flags != NULL && strchr(flags, 'd') != NULL) return (NULL); if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && *p && (purl = fetchParseURL(p)) != NULL) { if (!*purl->scheme) { if (getenv("FTP_PROXY") || getenv("ftp_proxy")) strcpy(purl->scheme, SCHEME_FTP); else strcpy(purl->scheme, SCHEME_HTTP); } if (!purl->port) purl->port = _fetch_default_proxy_port(purl->scheme); if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || strcasecmp(purl->scheme, SCHEME_HTTP) == 0) return (purl); fetchFreeURL(purl); } return (NULL); } /* * Process an FTP request */ FILE * _ftp_request(struct url *url, const char *op, struct url_stat *us, struct url *purl, const char *flags) { conn_t *conn; int oflag; /* check if we should use HTTP instead */ if (purl && strcasecmp(purl->scheme, SCHEME_HTTP) == 0) { if (strcmp(op, "STAT") == 0) return (_http_request(url, "HEAD", us, purl, flags)); else if (strcmp(op, "RETR") == 0) return (_http_request(url, "GET", us, purl, flags)); /* * Our HTTP code doesn't support PUT requests yet, so try * a direct connection. */ } /* connect to server */ conn = _ftp_cached_connect(url, purl, flags); if (purl) fetchFreeURL(purl); if (conn == NULL) return (NULL); /* change directory */ if (_ftp_cwd(conn, url->doc) == -1) return (NULL); /* stat file */ if (us && _ftp_stat(conn, url->doc, us) == -1 && fetchLastErrCode != FETCH_PROTO && fetchLastErrCode != FETCH_UNAVAIL) return (NULL); /* just a stat */ if (strcmp(op, "STAT") == 0) return (FILE *)1; /* bogus return value */ if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) oflag = O_WRONLY; else oflag = O_RDONLY; /* initiate the transfer */ return (_ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); } /* * Get and stat file */ FILE * fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) { return (_ftp_request(url, "RETR", us, _ftp_get_proxy(flags), flags)); } /* * Get file */ FILE * fetchGetFTP(struct url *url, const char *flags) { return (fetchXGetFTP(url, NULL, flags)); } /* * Put file */ FILE * fetchPutFTP(struct url *url, const char *flags) { return (_ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, _ftp_get_proxy(flags), flags)); } /* * Get file stats */ int fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) { FILE *f; f = _ftp_request(url, "STAT", us, _ftp_get_proxy(flags), flags); if (f == NULL) return (-1); return (0); } /* * List a directory */ /* ARGSUSED0 */ struct url_ent * fetchListFTP(struct url *url __unused, const char *flags __unused) { warnx("fetchListFTP(): not implemented"); return (NULL); }