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+/* $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 <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"
+
+static int ftp_cmd(conn_t *, const char *, ...) LIBFETCH_PRINTFLIKE(2, 3);
+#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;
+#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);
+
+#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", (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, *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 = 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;
+}