1 /* $OpenBSD: sftp-server.c,v 1.65 2006/07/22 20:48:23 stevesk Exp $ */
3 * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/types.h>
38 #include "sftp-common.h"
41 #define get_int64() buffer_get_int64(&iqueue);
42 #define get_int() buffer_get_int(&iqueue);
43 #define get_string(lenp) buffer_get_string(&iqueue, lenp);
46 LogLevel log_level = SYSLOG_LEVEL_ERROR;
49 struct passwd *pw = NULL;
50 char *client_addr = NULL;
52 /* input and output queue */
56 /* Version of client */
59 /* portable attributes, etc. */
61 typedef struct Stat Stat;
70 errno_to_portable(int unixerrno)
82 ret = SSH2_FX_NO_SUCH_FILE;
87 ret = SSH2_FX_PERMISSION_DENIED;
91 ret = SSH2_FX_BAD_MESSAGE;
94 ret = SSH2_FX_FAILURE;
101 flags_from_portable(int pflags)
105 if ((pflags & SSH2_FXF_READ) &&
106 (pflags & SSH2_FXF_WRITE)) {
108 } else if (pflags & SSH2_FXF_READ) {
110 } else if (pflags & SSH2_FXF_WRITE) {
113 if (pflags & SSH2_FXF_CREAT)
115 if (pflags & SSH2_FXF_TRUNC)
117 if (pflags & SSH2_FXF_EXCL)
123 string_from_portable(int pflags)
125 static char ret[128];
129 #define PAPPEND(str) { \
131 strlcat(ret, ",", sizeof(ret)); \
132 strlcat(ret, str, sizeof(ret)); \
135 if (pflags & SSH2_FXF_READ)
137 if (pflags & SSH2_FXF_WRITE)
139 if (pflags & SSH2_FXF_CREAT)
141 if (pflags & SSH2_FXF_TRUNC)
143 if (pflags & SSH2_FXF_EXCL)
152 return decode_attrib(&iqueue);
157 typedef struct Handle Handle;
163 u_int64_t bytes_read, bytes_write;
179 for (i = 0; i < sizeof(handles)/sizeof(Handle); i++)
180 handles[i].use = HANDLE_UNUSED;
184 handle_new(int use, const char *name, int fd, DIR *dirp)
188 for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) {
189 if (handles[i].use == HANDLE_UNUSED) {
190 handles[i].use = use;
191 handles[i].dirp = dirp;
193 handles[i].name = xstrdup(name);
194 handles[i].bytes_read = handles[i].bytes_write = 0;
202 handle_is_ok(int i, int type)
204 return i >= 0 && (u_int)i < sizeof(handles)/sizeof(Handle) &&
205 handles[i].use == type;
209 handle_to_string(int handle, char **stringp, int *hlenp)
211 if (stringp == NULL || hlenp == NULL)
213 *stringp = xmalloc(sizeof(int32_t));
214 put_u32(*stringp, handle);
215 *hlenp = sizeof(int32_t);
220 handle_from_string(const char *handle, u_int hlen)
224 if (hlen != sizeof(int32_t))
226 val = get_u32(handle);
227 if (handle_is_ok(val, HANDLE_FILE) ||
228 handle_is_ok(val, HANDLE_DIR))
234 handle_to_name(int handle)
236 if (handle_is_ok(handle, HANDLE_DIR)||
237 handle_is_ok(handle, HANDLE_FILE))
238 return handles[handle].name;
243 handle_to_dir(int handle)
245 if (handle_is_ok(handle, HANDLE_DIR))
246 return handles[handle].dirp;
251 handle_to_fd(int handle)
253 if (handle_is_ok(handle, HANDLE_FILE))
254 return handles[handle].fd;
259 handle_update_read(int handle, ssize_t bytes)
261 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
262 handles[handle].bytes_read += bytes;
266 handle_update_write(int handle, ssize_t bytes)
268 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
269 handles[handle].bytes_write += bytes;
273 handle_bytes_read(int handle)
275 if (handle_is_ok(handle, HANDLE_FILE))
276 return (handles[handle].bytes_read);
281 handle_bytes_write(int handle)
283 if (handle_is_ok(handle, HANDLE_FILE))
284 return (handles[handle].bytes_write);
289 handle_close(int handle)
293 if (handle_is_ok(handle, HANDLE_FILE)) {
294 ret = close(handles[handle].fd);
295 handles[handle].use = HANDLE_UNUSED;
296 xfree(handles[handle].name);
297 } else if (handle_is_ok(handle, HANDLE_DIR)) {
298 ret = closedir(handles[handle].dirp);
299 handles[handle].use = HANDLE_UNUSED;
300 xfree(handles[handle].name);
308 handle_log_close(int handle, char *emsg)
310 if (handle_is_ok(handle, HANDLE_FILE)) {
311 logit("%s%sclose \"%s\" bytes read %llu written %llu",
312 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
313 handle_to_name(handle),
314 handle_bytes_read(handle), handle_bytes_write(handle));
316 logit("%s%sclosedir \"%s\"",
317 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
318 handle_to_name(handle));
323 handle_log_exit(void)
327 for (i = 0; i < sizeof(handles)/sizeof(Handle); i++)
328 if (handles[i].use != HANDLE_UNUSED)
329 handle_log_close(i, "forced");
339 handle = get_string(&hlen);
341 val = handle_from_string(handle, hlen);
351 int mlen = buffer_len(m);
353 buffer_put_int(&oqueue, mlen);
354 buffer_append(&oqueue, buffer_ptr(m), mlen);
355 buffer_consume(m, mlen);
359 status_to_message(u_int32_t status)
361 const char *status_messages[] = {
362 "Success", /* SSH_FX_OK */
363 "End of file", /* SSH_FX_EOF */
364 "No such file", /* SSH_FX_NO_SUCH_FILE */
365 "Permission denied", /* SSH_FX_PERMISSION_DENIED */
366 "Failure", /* SSH_FX_FAILURE */
367 "Bad message", /* SSH_FX_BAD_MESSAGE */
368 "No connection", /* SSH_FX_NO_CONNECTION */
369 "Connection lost", /* SSH_FX_CONNECTION_LOST */
370 "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
371 "Unknown error" /* Others */
373 return (status_messages[MIN(status,SSH2_FX_MAX)]);
377 send_status(u_int32_t id, u_int32_t status)
381 debug3("request %u: sent status %u", id, status);
382 if (log_level > SYSLOG_LEVEL_VERBOSE ||
383 (status != SSH2_FX_OK && status != SSH2_FX_EOF))
384 logit("sent status %s", status_to_message(status));
386 buffer_put_char(&msg, SSH2_FXP_STATUS);
387 buffer_put_int(&msg, id);
388 buffer_put_int(&msg, status);
390 buffer_put_cstring(&msg, status_to_message(status));
391 buffer_put_cstring(&msg, "");
397 send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
402 buffer_put_char(&msg, type);
403 buffer_put_int(&msg, id);
404 buffer_put_string(&msg, data, dlen);
410 send_data(u_int32_t id, const char *data, int dlen)
412 debug("request %u: sent data len %d", id, dlen);
413 send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
417 send_handle(u_int32_t id, int handle)
422 handle_to_string(handle, &string, &hlen);
423 debug("request %u: sent handle handle %d", id, handle);
424 send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
429 send_names(u_int32_t id, int count, const Stat *stats)
435 buffer_put_char(&msg, SSH2_FXP_NAME);
436 buffer_put_int(&msg, id);
437 buffer_put_int(&msg, count);
438 debug("request %u: sent names count %d", id, count);
439 for (i = 0; i < count; i++) {
440 buffer_put_cstring(&msg, stats[i].name);
441 buffer_put_cstring(&msg, stats[i].long_name);
442 encode_attrib(&msg, &stats[i].attrib);
449 send_attrib(u_int32_t id, const Attrib *a)
453 debug("request %u: sent attrib have 0x%x", id, a->flags);
455 buffer_put_char(&msg, SSH2_FXP_ATTRS);
456 buffer_put_int(&msg, id);
457 encode_attrib(&msg, a);
470 verbose("received client version %d", version);
472 buffer_put_char(&msg, SSH2_FXP_VERSION);
473 buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
481 u_int32_t id, pflags;
484 int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
487 name = get_string(NULL);
488 pflags = get_int(); /* portable flags */
489 debug3("request %u: open flags %d", id, pflags);
491 flags = flags_from_portable(pflags);
492 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
493 logit("open \"%s\" flags %s mode 0%o",
494 name, string_from_portable(pflags), mode);
495 fd = open(name, flags, mode);
497 status = errno_to_portable(errno);
499 handle = handle_new(HANDLE_FILE, name, fd, NULL);
503 send_handle(id, handle);
507 if (status != SSH2_FX_OK)
508 send_status(id, status);
516 int handle, ret, status = SSH2_FX_FAILURE;
519 handle = get_handle();
520 debug3("request %u: close handle %u", id, handle);
521 handle_log_close(handle, NULL);
522 ret = handle_close(handle);
523 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
524 send_status(id, status);
532 int handle, fd, ret, status = SSH2_FX_FAILURE;
536 handle = get_handle();
540 debug("request %u: read \"%s\" (handle %d) off %llu len %d",
541 id, handle_to_name(handle), handle, (unsigned long long)off, len);
542 if (len > sizeof buf) {
544 debug2("read change len %d", len);
546 fd = handle_to_fd(handle);
548 if (lseek(fd, off, SEEK_SET) < 0) {
549 error("process_read: seek failed");
550 status = errno_to_portable(errno);
552 ret = read(fd, buf, len);
554 status = errno_to_portable(errno);
555 } else if (ret == 0) {
556 status = SSH2_FX_EOF;
558 send_data(id, buf, ret);
560 handle_update_read(handle, ret);
564 if (status != SSH2_FX_OK)
565 send_status(id, status);
574 int handle, fd, ret, status = SSH2_FX_FAILURE;
578 handle = get_handle();
580 data = get_string(&len);
582 debug("request %u: write \"%s\" (handle %d) off %llu len %d",
583 id, handle_to_name(handle), handle, (unsigned long long)off, len);
584 fd = handle_to_fd(handle);
586 if (lseek(fd, off, SEEK_SET) < 0) {
587 status = errno_to_portable(errno);
588 error("process_write: seek failed");
591 ret = write(fd, data, len);
593 error("process_write: write failed");
594 status = errno_to_portable(errno);
595 } else if ((size_t)ret == len) {
597 handle_update_write(handle, ret);
599 debug2("nothing at all written");
603 send_status(id, status);
608 process_do_stat(int do_lstat)
614 int ret, status = SSH2_FX_FAILURE;
617 name = get_string(NULL);
618 debug3("request %u: %sstat", id, do_lstat ? "l" : "");
619 verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
620 ret = do_lstat ? lstat(name, &st) : stat(name, &st);
622 status = errno_to_portable(errno);
624 stat_to_attrib(&st, &a);
628 if (status != SSH2_FX_OK)
629 send_status(id, status);
651 int fd, ret, handle, status = SSH2_FX_FAILURE;
654 handle = get_handle();
655 debug("request %u: fstat \"%s\" (handle %u)",
656 id, handle_to_name(handle), handle);
657 fd = handle_to_fd(handle);
659 ret = fstat(fd, &st);
661 status = errno_to_portable(errno);
663 stat_to_attrib(&st, &a);
668 if (status != SSH2_FX_OK)
669 send_status(id, status);
672 static struct timeval *
673 attrib_to_tv(const Attrib *a)
675 static struct timeval tv[2];
677 tv[0].tv_sec = a->atime;
679 tv[1].tv_sec = a->mtime;
685 process_setstat(void)
690 int status = SSH2_FX_OK, ret;
693 name = get_string(NULL);
695 debug("request %u: setstat name \"%s\"", id, name);
696 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
697 logit("set \"%s\" size %llu", name, a->size);
698 ret = truncate(name, a->size);
700 status = errno_to_portable(errno);
702 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
703 logit("set \"%s\" mode %04o", name, a->perm);
704 ret = chmod(name, a->perm & 0777);
706 status = errno_to_portable(errno);
708 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
712 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
714 logit("set \"%s\" modtime %s", name, buf);
715 ret = utimes(name, attrib_to_tv(a));
717 status = errno_to_portable(errno);
719 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
720 logit("set \"%s\" owner %lu group %lu", name,
721 (u_long)a->uid, (u_long)a->gid);
722 ret = chown(name, a->uid, a->gid);
724 status = errno_to_portable(errno);
726 send_status(id, status);
731 process_fsetstat(void)
736 int status = SSH2_FX_OK;
739 handle = get_handle();
741 debug("request %u: fsetstat handle %d", id, handle);
742 fd = handle_to_fd(handle);
744 status = SSH2_FX_FAILURE;
746 char *name = handle_to_name(handle);
748 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
749 logit("set \"%s\" size %llu", name, a->size);
750 ret = ftruncate(fd, a->size);
752 status = errno_to_portable(errno);
754 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
755 logit("set \"%s\" mode %04o", name, a->perm);
757 ret = fchmod(fd, a->perm & 0777);
759 ret = chmod(name, a->perm & 0777);
762 status = errno_to_portable(errno);
764 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
768 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
770 logit("set \"%s\" modtime %s", name, buf);
772 ret = futimes(fd, attrib_to_tv(a));
774 ret = utimes(name, attrib_to_tv(a));
777 status = errno_to_portable(errno);
779 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
780 logit("set \"%s\" owner %lu group %lu", name,
781 (u_long)a->uid, (u_long)a->gid);
783 ret = fchown(fd, a->uid, a->gid);
785 ret = chown(name, a->uid, a->gid);
788 status = errno_to_portable(errno);
791 send_status(id, status);
795 process_opendir(void)
799 int handle, status = SSH2_FX_FAILURE;
803 path = get_string(NULL);
804 debug3("request %u: opendir", id);
805 logit("opendir \"%s\"", path);
806 dirp = opendir(path);
808 status = errno_to_portable(errno);
810 handle = handle_new(HANDLE_DIR, path, 0, dirp);
814 send_handle(id, handle);
819 if (status != SSH2_FX_OK)
820 send_status(id, status);
825 process_readdir(void)
834 handle = get_handle();
835 debug("request %u: readdir \"%s\" (handle %d)", id,
836 handle_to_name(handle), handle);
837 dirp = handle_to_dir(handle);
838 path = handle_to_name(handle);
839 if (dirp == NULL || path == NULL) {
840 send_status(id, SSH2_FX_FAILURE);
843 char pathname[MAXPATHLEN];
845 int nstats = 10, count = 0, i;
847 stats = xcalloc(nstats, sizeof(Stat));
848 while ((dp = readdir(dirp)) != NULL) {
849 if (count >= nstats) {
851 stats = xrealloc(stats, nstats, sizeof(Stat));
854 snprintf(pathname, sizeof pathname, "%s%s%s", path,
855 strcmp(path, "/") ? "/" : "", dp->d_name);
856 if (lstat(pathname, &st) < 0)
858 stat_to_attrib(&st, &(stats[count].attrib));
859 stats[count].name = xstrdup(dp->d_name);
860 stats[count].long_name = ls_file(dp->d_name, &st, 0);
862 /* send up to 100 entries in one message */
863 /* XXX check packet size instead */
868 send_names(id, count, stats);
869 for (i = 0; i < count; i++) {
870 xfree(stats[i].name);
871 xfree(stats[i].long_name);
874 send_status(id, SSH2_FX_EOF);
885 int status = SSH2_FX_FAILURE;
889 name = get_string(NULL);
890 debug3("request %u: remove", id);
891 logit("remove name \"%s\"", name);
893 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
894 send_status(id, status);
904 int ret, mode, status = SSH2_FX_FAILURE;
907 name = get_string(NULL);
909 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
910 a->perm & 0777 : 0777;
911 debug3("request %u: mkdir", id);
912 logit("mkdir name \"%s\" mode 0%o", name, mode);
913 ret = mkdir(name, mode);
914 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
915 send_status(id, status);
927 name = get_string(NULL);
928 debug3("request %u: rmdir", id);
929 logit("rmdir name \"%s\"", name);
931 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
932 send_status(id, status);
937 process_realpath(void)
939 char resolvedname[MAXPATHLEN];
944 path = get_string(NULL);
945 if (path[0] == '\0') {
949 debug3("request %u: realpath", id);
950 verbose("realpath \"%s\"", path);
951 if (realpath(path, resolvedname) == NULL) {
952 send_status(id, errno_to_portable(errno));
955 attrib_clear(&s.attrib);
956 s.name = s.long_name = resolvedname;
957 send_names(id, 1, &s);
966 char *oldpath, *newpath;
971 oldpath = get_string(NULL);
972 newpath = get_string(NULL);
973 debug3("request %u: rename", id);
974 logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
975 status = SSH2_FX_FAILURE;
976 if (lstat(oldpath, &sb) == -1)
977 status = errno_to_portable(errno);
978 else if (S_ISREG(sb.st_mode)) {
979 /* Race-free rename of regular files */
980 if (link(oldpath, newpath) == -1) {
981 if (errno == EOPNOTSUPP
982 #ifdef LINK_OPNOTSUPP_ERRNO
983 || errno == LINK_OPNOTSUPP_ERRNO
989 * fs doesn't support links, so fall back to
990 * stat+rename. This is racy.
992 if (stat(newpath, &st) == -1) {
993 if (rename(oldpath, newpath) == -1)
995 errno_to_portable(errno);
1000 status = errno_to_portable(errno);
1002 } else if (unlink(oldpath) == -1) {
1003 status = errno_to_portable(errno);
1004 /* clean spare link */
1007 status = SSH2_FX_OK;
1008 } else if (stat(newpath, &sb) == -1) {
1009 if (rename(oldpath, newpath) == -1)
1010 status = errno_to_portable(errno);
1012 status = SSH2_FX_OK;
1014 send_status(id, status);
1020 process_readlink(void)
1024 char buf[MAXPATHLEN];
1028 path = get_string(NULL);
1029 debug3("request %u: readlink", id);
1030 verbose("readlink \"%s\"", path);
1031 if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1032 send_status(id, errno_to_portable(errno));
1037 attrib_clear(&s.attrib);
1038 s.name = s.long_name = buf;
1039 send_names(id, 1, &s);
1045 process_symlink(void)
1048 char *oldpath, *newpath;
1052 oldpath = get_string(NULL);
1053 newpath = get_string(NULL);
1054 debug3("request %u: symlink", id);
1055 logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1056 /* this will fail if 'newpath' exists */
1057 ret = symlink(oldpath, newpath);
1058 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1059 send_status(id, status);
1065 process_extended(void)
1071 request = get_string(NULL);
1072 send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1076 /* stolen from ssh-agent */
1087 buf_len = buffer_len(&iqueue);
1089 return; /* Incomplete message. */
1090 cp = buffer_ptr(&iqueue);
1091 msg_len = get_u32(cp);
1092 if (msg_len > SFTP_MAX_MSG_LENGTH) {
1093 error("bad message from %s local user %s",
1094 client_addr, pw->pw_name);
1097 if (buf_len < msg_len + 4)
1099 buffer_consume(&iqueue, 4);
1101 type = buffer_get_char(&iqueue);
1109 case SSH2_FXP_CLOSE:
1115 case SSH2_FXP_WRITE:
1118 case SSH2_FXP_LSTAT:
1121 case SSH2_FXP_FSTAT:
1124 case SSH2_FXP_SETSTAT:
1127 case SSH2_FXP_FSETSTAT:
1130 case SSH2_FXP_OPENDIR:
1133 case SSH2_FXP_READDIR:
1136 case SSH2_FXP_REMOVE:
1139 case SSH2_FXP_MKDIR:
1142 case SSH2_FXP_RMDIR:
1145 case SSH2_FXP_REALPATH:
1151 case SSH2_FXP_RENAME:
1154 case SSH2_FXP_READLINK:
1157 case SSH2_FXP_SYMLINK:
1160 case SSH2_FXP_EXTENDED:
1164 error("Unknown message %d", type);
1167 /* discard the remaining bytes from the current packet */
1168 if (buf_len < buffer_len(&iqueue))
1169 fatal("iqueue grew unexpectedly");
1170 consumed = buf_len - buffer_len(&iqueue);
1171 if (msg_len < consumed)
1172 fatal("msg_len %d < consumed %d", msg_len, consumed);
1173 if (msg_len > consumed)
1174 buffer_consume(&iqueue, msg_len - consumed);
1177 /* Cleanup handler that logs active handles upon normal exit */
1181 if (pw != NULL && client_addr != NULL) {
1183 logit("session closed for local user %s from [%s]",
1184 pw->pw_name, client_addr);
1192 extern char *__progname;
1195 "usage: %s [-he] [-l log_level] [-f log_facility]\n", __progname);
1200 main(int argc, char **argv)
1202 fd_set *rset, *wset;
1203 int in, out, max, ch, skipargs = 0, log_stderr = 0;
1204 ssize_t len, olen, set_size;
1205 SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1208 extern char *optarg;
1209 extern char *__progname;
1211 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1214 __progname = ssh_get_progname(argv[0]);
1215 log_init(__progname, log_level, log_facility, log_stderr);
1217 while (!skipargs && (ch = getopt(argc, argv, "C:f:l:che")) != -1) {
1221 * Ignore all arguments if we are invoked as a
1222 * shell using "sftp-server -c command"
1230 log_level = log_level_number(optarg);
1231 if (log_level == SYSLOG_LEVEL_NOT_SET)
1232 error("Invalid log level \"%s\"", optarg);
1235 log_facility = log_facility_number(optarg);
1236 if (log_level == SYSLOG_FACILITY_NOT_SET)
1237 error("Invalid log facility \"%s\"", optarg);
1245 log_init(__progname, log_level, log_facility, log_stderr);
1247 if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1248 client_addr = xstrdup(cp);
1249 if ((cp = strchr(client_addr, ' ')) == NULL)
1250 fatal("Malformed SSH_CONNECTION variable: \"%s\"",
1251 getenv("SSH_CONNECTION"));
1254 client_addr = xstrdup("UNKNOWN");
1256 if ((pw = getpwuid(getuid())) == NULL)
1257 fatal("No user found for uid %lu", (u_long)getuid());
1260 logit("session opened for local user %s from [%s]",
1261 pw->pw_name, client_addr);
1265 in = dup(STDIN_FILENO);
1266 out = dup(STDOUT_FILENO);
1269 setmode(in, O_BINARY);
1270 setmode(out, O_BINARY);
1279 buffer_init(&iqueue);
1280 buffer_init(&oqueue);
1282 set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1283 rset = (fd_set *)xmalloc(set_size);
1284 wset = (fd_set *)xmalloc(set_size);
1287 memset(rset, 0, set_size);
1288 memset(wset, 0, set_size);
1291 olen = buffer_len(&oqueue);
1295 if (select(max+1, rset, wset, NULL, NULL) < 0) {
1298 error("select: %s", strerror(errno));
1302 /* copy stdin to iqueue */
1303 if (FD_ISSET(in, rset)) {
1305 len = read(in, buf, sizeof buf);
1309 } else if (len < 0) {
1310 error("read: %s", strerror(errno));
1313 buffer_append(&iqueue, buf, len);
1316 /* send oqueue to stdout */
1317 if (FD_ISSET(out, wset)) {
1318 len = write(out, buffer_ptr(&oqueue), olen);
1320 error("write: %s", strerror(errno));
1323 buffer_consume(&oqueue, len);
1326 /* process requests from client */