/*- * 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. * * $Id: ftp.c,v 1.6 1998/11/05 19:48:17 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 "fetch.h" #include "common.h" #include "ftperr.inc" #define FTP_DEFAULT_TO_ANONYMOUS #define FTP_ANONYMOUS_USER "ftp" #define FTP_ANONYMOUS_PASSWORD "ftp" #define FTP_DEFAULT_PORT 21 #define FTP_OPEN_DATA_CONNECTION 150 #define FTP_OK 200 #define FTP_PASSIVE_MODE 227 #define FTP_LOGGED_IN 230 #define FTP_FILE_ACTION_OK 250 #define FTP_NEED_PASSWORD 331 #define FTP_NEED_ACCOUNT 332 #define ENDL "\r\n" static struct url cached_host; static FILE *cached_socket; static char *_ftp_last_reply; /* * Get server response, check that first digit is a '2' */ static int _ftp_chkerr(FILE *s, int *e) { char *line; size_t len; int err; if (e) *e = 0; do { if (((line = fgetln(s, &len)) == NULL) || (len < 4)) { _fetch_syserr(); return -1; } } while (line[3] == '-'); _ftp_last_reply = line; #ifndef NDEBUG fprintf(stderr, "\033[1m<<< "); fprintf(stderr, "%*.*s", (int)len, (int)len, line); fprintf(stderr, "\033[m"); #endif if (!isdigit(line[1]) || !isdigit(line[1]) || !isdigit(line[2]) || (line[3] != ' ')) { _ftp_seterr(0); return -1; } err = (line[0] - '0') * 100 + (line[1] - '0') * 10 + (line[2] - '0'); _ftp_seterr(err); if (e) *e = err; return (line[0] == '2') - 1; } /* * Send a command and check reply */ static int _ftp_cmd(FILE *f, char *fmt, ...) { va_list ap; int e; va_start(ap, fmt); vfprintf(f, fmt, ap); #ifndef NDEBUG fprintf(stderr, "\033[1m>>> "); vfprintf(stderr, fmt, ap); fprintf(stderr, "\033[m"); #endif va_end(ap); _ftp_chkerr(f, &e); return e; } /* * Transfer file */ static FILE * _ftp_transfer(FILE *cf, char *oper, char *file, char *mode, int pasv) { struct sockaddr_in sin; int sd = -1, l; char *s; FILE *df; /* change directory */ if (((s = strrchr(file, '/')) != NULL) && (s != file)) { *s = 0; if (_ftp_cmd(cf, "CWD %s" ENDL, file) != FTP_FILE_ACTION_OK) { *s = '/'; return NULL; } *s++ = '/'; } else { if (_ftp_cmd(cf, "CWD /" ENDL) != FTP_FILE_ACTION_OK) return NULL; } /* s now points to file name */ /* open data socket */ if ((sd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) { _fetch_syserr(); return NULL; } if (pasv) { u_char addr[6]; char *ln, *p; int i; /* send PASV command */ if (_ftp_cmd(cf, "PASV" ENDL) != FTP_PASSIVE_MODE) 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 = _ftp_last_reply; for (p = ln + 3; !isdigit(*p); p++) /* nothing */ ; for (p--, i = 0; i < 6; i++) { p++; /* skip the comma */ addr[i] = strtol(p, &p, 10); } /* construct sockaddr for data socket */ l = sizeof(sin); if (getpeername(fileno(cf), (struct sockaddr *)&sin, &l) == -1) goto sysouch; bcopy(addr, (char *)&sin.sin_addr, 4); bcopy(addr + 4, (char *)&sin.sin_port, 2); /* connect to data port */ if (connect(sd, (struct sockaddr *)&sin, sizeof(sin)) == -1) goto sysouch; /* make the server initiate the transfer */ if (_ftp_cmd(cf, "%s %s" ENDL, oper, s) != FTP_OPEN_DATA_CONNECTION) goto ouch; } else { u_int32_t a; u_short p; int d; /* find our own address, bind, and listen */ l = sizeof(sin); if (getsockname(fileno(cf), (struct sockaddr *)&sin, &l) == -1) goto sysouch; sin.sin_port = 0; if (bind(sd, (struct sockaddr *)&sin, l) == -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; a = ntohl(sin.sin_addr.s_addr); p = ntohs(sin.sin_port); if (_ftp_cmd(cf, "PORT %d,%d,%d,%d,%d,%d" ENDL, (a >> 24) & 0xff, (a >> 16) & 0xff, (a >> 8) & 0xff, a & 0xff, (p >> 8) & 0xff, p & 0xff) != FTP_OK) goto ouch; /* make the server initiate the transfer */ if (_ftp_cmd(cf, "%s %s" ENDL, oper, s) != 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(); ouch: close(sd); return NULL; } /* * Log on to FTP server */ static FILE * _ftp_connect(char *host, int port, char *user, char *pwd) { int sd, e, pp = FTP_DEFAULT_PORT; char *p, *q; FILE *f; /* check for proxy */ if ((p = getenv("FTP_PROXY")) != NULL) { if ((q = strchr(p, ':')) != NULL) { /* XXX check that it's a valid number */ pp = atoi(q+1); } if (q) *q = 0; sd = fetchConnect(p, pp); if (q) *q = ':'; } else { /* no proxy, go straight to target */ sd = fetchConnect(host, port); } /* check connection */ if (sd == -1) { _fetch_syserr(); return NULL; } /* streams make life easier */ if ((f = fdopen(sd, "r+")) == NULL) { _fetch_syserr(); goto ouch; } /* expect welcome message */ if (_ftp_chkerr(f, NULL) == -1) goto fouch; /* send user name and password */ if (!user || !*user) user = FTP_ANONYMOUS_USER; e = p ? _ftp_cmd(f, "USER %s@%s@%d" ENDL, user, host, port) : _ftp_cmd(f, "USER %s" ENDL, user); /* did the server request a password? */ if (e == FTP_NEED_PASSWORD) { if (!pwd || !*pwd) pwd = FTP_ANONYMOUS_PASSWORD; e = _ftp_cmd(f, "PASS %s" ENDL, pwd); } /* did the server request an account? */ if (e == FTP_NEED_ACCOUNT) /* help! */ ; /* 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 (_ftp_cmd(f, "MODE S" ENDL) != FTP_OK) /* default is S */ goto ouch; #endif if (_ftp_cmd(f, "TYPE I" ENDL) != FTP_OK) /* default is A */ goto ouch; /* done */ return f; ouch: close(sd); return NULL; fouch: fclose(f); return NULL; } /* * Disconnect from server */ static void _ftp_disconnect(FILE *f) { _ftp_cmd(f, "QUIT" ENDL); fclose(f); } /* * 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)); } /* * FTP session */ static FILE * fetchXxxFTP(struct url *url, char *oper, char *mode, char *flags) { FILE *cf = NULL; int e; /* set default port */ if (!url->port) url->port = FTP_DEFAULT_PORT; /* try to use previously cached connection; there should be a 226 waiting */ if (_ftp_isconnected(url)) { _ftp_chkerr(cached_socket, &e); if (e > 0) cf = cached_socket; } /* connect to server */ if (!cf) { cf = _ftp_connect(url->host, url->port, url->user, url->pwd); if (!cf) return NULL; if (cached_socket) _ftp_disconnect(cached_socket); cached_socket = cf; memcpy(&cached_host, url, sizeof(struct url)); } /* initiate the transfer */ return _ftp_transfer(cf, oper, url->doc, mode, (flags && strchr(flags, 'p'))); } /* * Itsy bitsy teeny weenie */ FILE * fetchGetFTP(struct url *url, char *flags) { return fetchXxxFTP(url, "RETR", "r", flags); } FILE * fetchPutFTP(struct url *url, char *flags) { if (flags && strchr(flags, 'a')) return fetchXxxFTP(url, "APPE", "w", flags); else return fetchXxxFTP(url, "STOR", "w", flags); } extern void warnx(char *fmt, ...); int fetchStatFTP(struct url *url, struct url_stat *us, char *flags) { warnx("fetchStatFTP(): not implemented"); return -1; }