/* $NetBSD: ftp.c,v 1.46 2014/06/11 13:12:12 joerg Exp $ */ /*- * Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav * Copyright (c) 2008, 2009, 2010 Joerg Sonnenberger * 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: ftp.c,v 1.101 2008/01/23 20:57:59 des 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" static int ftp_cmd(conn_t *, const char *, ...) LIBFETCH_PRINTFLIKE(2, 3); #define FTP_ANONYMOUS_USER "anonymous" #define FTP_ANONYMOUS_PASSWORD "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 #define isftpreply(foo) \ (isdigit((unsigned char)foo[0]) && \ isdigit((unsigned char)foo[1]) && \ isdigit((unsigned char)foo[2]) && \ (foo[3] == ' ' || foo[3] == '\0')) #define isftpinfo(foo) \ (isdigit((unsigned char)foo[0]) && \ isdigit((unsigned char)foo[1]) && \ isdigit((unsigned char)foo[2]) && \ foo[3] == '-') /* * Translate IPv4 mapped IPv6 address to IPv4 address */ static void unmappedaddr(struct sockaddr_in6 *sin6, socklen_t *len) { struct sockaddr_in *sin4; uint32_t addr; int port; if (sin6->sin6_family != AF_INET6 || !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) return; sin4 = (struct sockaddr_in *)sin6; #ifdef s6_addr32 addr = sin6->sin6_addr.s6_addr32[3]; #else memcpy(&addr, &sin6->sin6_addr.s6_addr[12], sizeof(addr)); #endif 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; *len = sizeof(struct sockaddr_in); #ifdef HAVE_SA_LEN sin4->sin_len = sizeof(struct sockaddr_in); #endif } /* * 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 char)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 */ LIBFETCH_PRINTFLIKE(2, 3) 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_write(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, int subdir) { const char *s; if ((s = strrchr(file, '/')) == NULL || subdir) 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) { 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); *pwd = malloc(end - src + 1); if (*pwd == NULL) return (FTP_PROTOCOL_ERROR); for (q = 0, dst = *pwd; src < end; ++src) { if (!q && *src == '"') q = 1; else if (q && *src != '"') break; else if (q) *dst++ = '"', q = 0; else *dst++ = *src; } *dst = '\0'; if (**pwd != '/') { free(*pwd); *pwd = NULL; return (FTP_PROTOCOL_ERROR); } return (FTP_OK); } /* * Change working directory to the directory that contains the specified * file. */ static int ftp_cwd(conn_t *conn, const char *path, int subdir) { const char *beg, *end; char *pwd, *dst; int e, i, len; if (*path != '/') { ftp_seterr(501); return (-1); } ++path; /* Simple case: still in the home directory and no directory change. */ if (conn->ftp_home == NULL && strchr(path, '/') == NULL && (!subdir || *path == '\0')) return 0; if ((e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || (e = ftp_pwd(conn, &pwd)) != FTP_OK) { ftp_seterr(e); return (-1); } if (conn->ftp_home == NULL && (conn->ftp_home = strdup(pwd)) == NULL) { fetch_syserr(); free(pwd); return (-1); } if (*path == '/') { while (path[1] == '/') ++path; dst = strdup(path); } else if (strcmp(conn->ftp_home, "/") == 0) { dst = strdup(path - 1); } else { if (asprintf(&dst, "%s/%s", conn->ftp_home, path) == -1) dst = NULL; } if (dst == NULL) { fetch_syserr(); free(pwd); return (-1); } if (subdir) end = dst + strlen(dst); else end = strrchr(dst, '/'); for (;;) { len = strlen(pwd); /* Look for a common prefix between PWD and dir to fetch. */ for (i = 0; i <= len && i <= end - dst; ++i) if (pwd[i] != dst[i]) break; /* Keep going up a dir until we have a matching prefix. */ if (strcmp(pwd, "/") == 0) break; if (pwd[i] == '\0' && (dst[i - 1] == '/' || dst[i] == '/')) break; free(pwd); if ((e = ftp_cmd(conn, "CDUP\r\n")) != FTP_FILE_ACTION_OK || (e = ftp_cmd(conn, "PWD\r\n")) != FTP_WORKING_DIRECTORY || (e = ftp_pwd(conn, &pwd)) != FTP_OK) { ftp_seterr(e); free(dst); return (-1); } } free(pwd); /* Skip leading slashes, even "////". */ for (beg = dst + i; beg < end && *beg == '/'; ++beg, ++i) /* nothing */ ; /* If there is no trailing dir, we're already there. */ if (beg >= end) { free(dst); return (0); } /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(end - beg), beg); if (e == FTP_FILE_ACTION_OK) { free(dst); return (0); } /* That didn't work so go back to legacy behavior (multiple CWDs). */ for (beg = dst + i; beg < end; beg = dst + i + 1) { while (*beg == '/') ++beg, ++i; for (++i; dst + i < end && dst[i] != '/'; ++i) /* nothing */ ; e = ftp_cmd(conn, "CWD %.*s\r\n", (int)(dst + i - beg), beg); if (e != FTP_FILE_ACTION_OK) { free(dst); ftp_seterr(e); return (-1); } } free(dst); 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'; case 'S': break; default: return (FTP_PROTOCOL_ERROR); } if ((e = ftp_cmd(conn, "MODE %c\r\n", 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'; case 'I': break; case 'a': type = 'A'; case 'A': break; case 'd': type = 'D'; case 'D': /* can't handle yet */ default: return (FTP_PROTOCOL_ERROR); } if ((e = ftp_cmd(conn, "TYPE %c\r\n", 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, year; struct tm tm; time_t t; int e; us->size = -1; us->atime = us->mtime = 0; filename = ftp_filename(file, &filenamelen, &type, 0); if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { ftp_seterr(e); return (-1); } e = ftp_cmd(conn, "SIZE %.*s\r\n", (int)filenamelen, filename); if (e != FTP_FILE_STATUS) { ftp_seterr(e); return (-1); } for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) /* nothing */ ; for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) us->size = us->size * 10 + *ln - '0'; if (*ln && !isspace((unsigned char)*ln)) { ftp_seterr(FTP_PROTOCOL_ERROR); us->size = -1; return (-1); } if (us->size == 0) us->size = -1; e = ftp_cmd(conn, "MDTM %.*s\r\n", (int)filenamelen, filename); if (e != FTP_FILE_STATUS) { ftp_seterr(e); return (-1); } for (ln = conn->buf + 4; *ln && isspace((unsigned char)*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", &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 = year - 1900; tm.tm_isdst = -1; t = timegm(&tm); if (t == (time_t)-1) t = time(NULL); us->mtime = t; us->atime = t; 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 ssize_t ftp_readfn(void *, void *, size_t); static ssize_t ftp_writefn(void *, const void *, size_t); static void ftp_closefn(void *); static ssize_t ftp_readfn(void *v, void *buf, size_t 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, len); if (r > 0) return (r); if (r == 0) { io->eof = 1; return (0); } if (errno != EINTR) io->err = errno; return (-1); } static ssize_t ftp_writefn(void *v, const void *buf, size_t 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, len); if (w >= 0) return (w); if (errno != EINTR) io->err = errno; return (-1); } static int ftp_disconnect(conn_t *conn) { ftp_cmd(conn, "QUIT\r\n"); return fetch_close(conn); } static void ftp_closefn(void *v) { struct ftpio *io; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return; } if (io->dir == -1) return; if (io->cconn == NULL || io->dconn == NULL) { errno = EBADF; return; } fetch_close(io->dconn); io->dconn = NULL; io->dir = -1; ftp_chkerr(io->cconn); fetch_cache_put(io->cconn, ftp_disconnect); free(io); return; } static fetchIO * ftp_setup(conn_t *cconn, conn_t *dconn, int mode) { struct ftpio *io; fetchIO *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 = fetchIO_unopen(io, ftp_readfn, ftp_writefn, ftp_closefn); if (f == NULL) free(io); return (f); } /* * Transfer file */ static fetchIO * ftp_transfer(conn_t *conn, const char *oper, const char *file, const char *op_arg, int mode, off_t offset, const char *flags) { union anonymous { struct sockaddr_storage ss; struct sockaddr sa; struct sockaddr_in6 sin6; struct sockaddr_in sin4; } u; const char *bindaddr; const char *filename; int filenamelen, type; int pasv, verbose; int e, sd = -1; socklen_t l; char *s; fetchIO *df; /* check flags */ pasv = !CHECK_FLAG('a'); 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, op_arg != NULL); /* 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(u.ss); if (getsockname(conn->sd, &u.sa, &l) == -1) goto sysouch; if (u.ss.ss_family == AF_INET6) unmappedaddr(&u.sin6, &l); retry_mode: /* open data socket */ if ((sd = socket(u.ss.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { fetch_syserr(); return (NULL); } if (pasv) { unsigned char addr[64]; char *ln, *p; unsigned int i; int port; /* send PASV command */ if (verbose) fetch_info("setting passive mode"); switch (u.ss.ss_family) { case AF_INET: if ((e = ftp_cmd(conn, "PASV\r\n")) != FTP_PASSIVE_MODE) goto ouch; break; case AF_INET6: if ((e = ftp_cmd(conn, "EPSV\r\n")) != FTP_EPASSIVE_MODE) { if (e == -1) goto ouch; if ((e = ftp_cmd(conn, "LPSV\r\n")) != 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 char)*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; case FTP_SYNTAX_ERROR: if (verbose) fetch_info("passive mode failed"); /* Close socket and retry with passive mode. */ pasv = 0; close(sd); sd = -1; goto retry_mode; } /* seek to required offset */ if (offset) if (ftp_cmd(conn, "REST %lu\r\n", (unsigned long)offset) != FTP_FILE_OK) goto sysouch; /* construct sockaddr for data socket */ l = sizeof(u.ss); if (getpeername(conn->sd, &u.sa, &l) == -1) goto sysouch; if (u.ss.ss_family == AF_INET6) unmappedaddr(&u.sin6, &l); switch (u.ss.ss_family) { case AF_INET6: if (e == FTP_EPASSIVE_MODE) u.sin6.sin6_port = htons(port); else { memcpy(&u.sin6.sin6_addr, addr + 2, 16); memcpy(&u.sin6.sin6_port, addr + 19, 2); } break; case AF_INET: if (e == FTP_EPASSIVE_MODE) u.sin4.sin_port = htons(port); else { memcpy(&u.sin4.sin_addr, addr, 4); memcpy(&u.sin4.sin_port, addr + 4, 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, u.ss.ss_family, bindaddr) != 0) goto sysouch; if (connect(sd, &u.sa, l) == -1) goto sysouch; /* make the server initiate the transfer */ if (verbose) fetch_info("initiating transfer"); if (op_arg) e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); else e = ftp_cmd(conn, "%s %.*s\r\n", oper, (int)filenamelen, filename); if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) goto ouch; } else { uint32_t a; uint16_t p; #if defined(IPV6_PORTRANGE) || defined(IP_PORTRANGE) int arg; int low = CHECK_FLAG('l'); #endif int d; char hname[INET6_ADDRSTRLEN]; switch (u.ss.ss_family) { case AF_INET6: u.sin6.sin6_port = 0; #ifdef IPV6_PORTRANGE arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, (char *)&arg, sizeof(arg)) == -1) goto sysouch; #endif break; case AF_INET: u.sin4.sin_port = 0; #ifdef IP_PORTRANGE arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, (char *)&arg, sizeof(arg)) == -1) goto sysouch; #endif break; } if (verbose) fetch_info("binding data socket"); if (bind(sd, &u.sa, l) == -1) goto sysouch; if (listen(sd, 1) == -1) goto sysouch; /* find what port we're on and tell the server */ if (getsockname(sd, &u.sa, &l) == -1) goto sysouch; switch (u.ss.ss_family) { case AF_INET: a = ntohl(u.sin4.sin_addr.s_addr); p = ntohs(u.sin4.sin_port); e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d\r\n", (a >> 24) & 0xff, (a >> 16) & 0xff, (a >> 8) & 0xff, a & 0xff, (p >> 8) & 0xff, p & 0xff); break; case AF_INET6: e = -1; u.sin6.sin6_scope_id = 0; if (getnameinfo(&u.sa, l, hname, sizeof(hname), NULL, 0, NI_NUMERICHOST) == 0) { e = ftp_cmd(conn, "EPRT |%d|%s|%d|\r\n", 2, hname, htons(u.sin6.sin6_port)); if (e == -1) goto ouch; } if (e != FTP_OK) { unsigned char *ap = (void *)&u.sin6.sin6_addr.s6_addr; uint16_t port = ntohs(u.sin6.sin6_port); e = ftp_cmd(conn, "LPRT %d,%d,%u,%u,%u,%u,%u,%u,%u,%u," "%u,%u,%u,%u,%u,%u,%u,%u,%d,%d,%d\r\n", 6, 16, (unsigned)ap[0], (unsigned)ap[1], (unsigned)ap[2], (unsigned)ap[3], (unsigned)ap[4], (unsigned)ap[5], (unsigned)ap[6], (unsigned)ap[7], (unsigned)ap[8], (unsigned)ap[9], (unsigned)ap[10], (unsigned)ap[11], (unsigned)ap[12], (unsigned)ap[13], (unsigned)ap[14], (unsigned)ap[15], 2, port >> 8, 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 %llu\r\n", (unsigned long long)offset) != FTP_FILE_OK) goto sysouch; /* make the server initiate the transfer */ if (verbose) fetch_info("initiating transfer"); if (op_arg) e = ftp_cmd(conn, "%s%s%s\r\n", oper, *op_arg ? " " : "", op_arg); else e = ftp_cmd(conn, "%s %.*s\r\n", oper, (int)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; int e; /* 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\r\n", user, url->host); else if (purl) e = ftp_cmd(conn, "USER %s@%s@%d\r\n", user, url->host, url->port); else e = ftp_cmd(conn, "USER %s\r\n", 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') pwd = FTP_ANONYMOUS_PASSWORD; e = ftp_cmd(conn, "PASS %s\r\n", 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; int af = AF_UNSPEC; 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! */ /* XXX connetion caching */ if (!purl->port) purl->port = fetch_default_port(purl->scheme); conn = fetch_connect(purl, af, verbose); } else { /* no proxy, go straight to target */ if (!url->port) url->port = fetch_default_port(url->scheme); while ((conn = fetch_cache_get(url, af)) != NULL) { e = ftp_cmd(conn, "NOOP\r\n"); if (e == FTP_OK) return conn; fetch_close(conn); } conn = fetch_connect(url, 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); } /* * Check the proxy settings */ static struct url * ftp_get_proxy(struct url * url, const char *flags) { struct url *purl; char *p; if (flags != NULL && strchr(flags, 'd') != NULL) return (NULL); if (fetch_no_proxy_match(url->host)) 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 */ fetchIO * ftp_request(struct url *url, const char *op, const char *op_arg, struct url_stat *us, struct url *purl, const char *flags) { fetchIO *f; char *path; conn_t *conn; int if_modified_since, oflag; struct url_stat local_us; /* 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_connect(url, purl, flags); if (purl) fetchFreeURL(purl); if (conn == NULL) return (NULL); if ((path = fetchUnquotePath(url)) == NULL) { fetch_close(conn); fetch_syserr(); return NULL; } /* change directory */ if (ftp_cwd(conn, path, op_arg != NULL) == -1) { fetch_close(conn); free(path); return (NULL); } if_modified_since = CHECK_FLAG('i'); if (if_modified_since && us == NULL) us = &local_us; /* stat file */ if (us && ftp_stat(conn, path, us) == -1 && fetchLastErrCode != FETCH_PROTO && fetchLastErrCode != FETCH_UNAVAIL) { fetch_close(conn); free(path); return (NULL); } if (if_modified_since && url->last_modified > 0 && url->last_modified >= us->mtime) { fetch_cache_put(conn, ftp_disconnect); free(path); fetchLastErrCode = FETCH_UNCHANGED; snprintf(fetchLastErrString, MAXERRSTRING, "Unchanged"); return NULL; } /* just a stat */ if (strcmp(op, "STAT") == 0) { fetch_cache_put(conn, ftp_disconnect); free(path); return fetchIO_unopen(NULL, NULL, NULL, NULL); } if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) oflag = O_WRONLY; else oflag = O_RDONLY; /* initiate the transfer */ f = (ftp_transfer(conn, op, path, op_arg, oflag, url->offset, flags)); free(path); return f; } /* * Get and stat file */ fetchIO * fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) { return (ftp_request(url, "RETR", NULL, us, ftp_get_proxy(url, flags), flags)); } /* * Get file */ fetchIO * fetchGetFTP(struct url *url, const char *flags) { return (fetchXGetFTP(url, NULL, flags)); } /* * Put file */ fetchIO * fetchPutFTP(struct url *url, const char *flags) { return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, NULL, ftp_get_proxy(url, flags), flags)); } /* * Get file stats */ int fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) { fetchIO *f; f = ftp_request(url, "STAT", NULL, us, ftp_get_proxy(url, flags), flags); if (f == NULL) return (-1); fetchIO_close(f); return (0); } /* * List a directory */ int fetchListFTP(struct url_list *ue, struct url *url, const char *pattern, const char *flags) { fetchIO *f; char buf[2 * PATH_MAX], *eol, *eos; ssize_t len; size_t cur_off; int ret; /* XXX What about proxies? */ if (pattern == NULL || strcmp(pattern, "*") == 0) pattern = ""; f = ftp_request(url, "NLST", pattern, NULL, ftp_get_proxy(url, flags), flags); if (f == NULL) return -1; cur_off = 0; ret = 0; while ((len = fetchIO_read(f, buf + cur_off, sizeof(buf) - cur_off)) > 0) { cur_off += len; while ((eol = memchr(buf, '\n', cur_off)) != NULL) { if (len == eol - buf) break; if (eol != buf) { if (eol[-1] == '\r') eos = eol - 1; else eos = eol; *eos = '\0'; ret = fetch_add_entry(ue, url, buf, 0); if (ret) break; cur_off -= eol - buf + 1; memmove(buf, eol + 1, cur_off); } } if (ret) break; } if (cur_off != 0 || len < 0) { /* Not RFC conform, bail out. */ fetchIO_close(f); return -1; } fetchIO_close(f); return ret; }