diff options
Diffstat (limited to 'libfetch/ftp.c')
| -rw-r--r-- | libfetch/ftp.c | 1306 |
1 files changed, 1306 insertions, 0 deletions
diff --git a/libfetch/ftp.c b/libfetch/ftp.c new file mode 100644 index 0000000..b5688f2 --- /dev/null +++ b/libfetch/ftp.c @@ -0,0 +1,1306 @@ +/* $NetBSD: ftp.c,v 1.36 2010/08/20 17:56:49 joerg Exp $ */ +/*- + * Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav + * Copyright (c) 2008, 2009, 2010 Joerg Sonnenberger <joerg@NetBSD.org> + * 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): + * <phk@FreeBSD.org> 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 $ + * + */ + +#ifdef __linux__ +/* Keep this down to Linux, it can create surprises else where. */ +#define _GNU_SOURCE +#endif + +#if HAVE_CONFIG_H +#include "config.h" +#endif +#ifndef NETBSD +#include <nbcompat.h> +#endif + +#include <sys/types.h> +#include <sys/socket.h> + +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#if defined(HAVE_INTTYPES_H) || defined(NETBSD) +#include <inttypes.h> +#endif +#include <stdarg.h> +#ifndef NETBSD +#include <nbcompat/netdb.h> +#include <nbcompat/stdio.h> +#else +#include <netdb.h> +#include <stdio.h> +#endif +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> + +#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 + +#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; + memcpy( &addr, &sin6->sin6_addr.s6_addr[12], sizeof( uint32_t ) ); + 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 + */ +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 = (char *)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 { + asprintf(&dst, "%s/%s", conn->ftp_home, path); + } + 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); + +#ifdef FTP_COMBINE_CWDS + /* 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); + } +#endif /* FTP_COMBINE_CWDS */ + + /* 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", 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; + 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", 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", 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", + &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; + + 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, (char *)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; + (void)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 = (struct ftpio *)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; +#ifdef IPV6_PORTRANGE + int low; +#endif + int e, sd = -1; + socklen_t l; + char *s; + fetchIO *df; + + /* check flags */ +#ifdef IPV6_PORTRANGE + low = CHECK_FLAG('l'); +#endif + 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, + 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; +#endif + int d; + char *ap; + 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: +#define UC(b) (((int)b)&0xff) + 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) { + ap = (char *)&u.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\r\n", + 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(u.sin6.sin6_port) >> 8) & 0xff, + ntohs(u.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 %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, + 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, *login_name; + char pbuf[URL_USERLEN + 1 + URL_HOSTLEN + 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\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') { + if ((login_name = getlogin()) == 0) + login_name = FTP_ANONYMOUS_USER; + if ((len = snprintf(pbuf, URL_USERLEN + 2, "%s@", login_name)) < 0) + len = 0; + else if (len > URL_USERLEN + 1) + len = URL_USERLEN + 1; + gethostname(pbuf + len, sizeof(pbuf) - len); + /* MAXHOSTNAMELEN can differ from URL_HOSTLEN + 1 */ + pbuf[sizeof(pbuf) - 1] = '\0'; + pwd = pbuf; + } + 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; +#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! */ + /* 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 = (char *)memchr((char *)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; +} |