1 /* $OpenBSD: sftp-server.c,v 1.63 2006/07/17 01:31:09 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>
36 #include "sftp-common.h"
39 #define get_int64() buffer_get_int64(&iqueue);
40 #define get_int() buffer_get_int(&iqueue);
41 #define get_string(lenp) buffer_get_string(&iqueue, lenp);
44 LogLevel log_level = SYSLOG_LEVEL_ERROR;
47 struct passwd *pw = NULL;
48 char *client_addr = NULL;
50 /* input and output queue */
54 /* Version of client */
57 /* portable attributes, etc. */
59 typedef struct Stat Stat;
68 errno_to_portable(int unixerrno)
80 ret = SSH2_FX_NO_SUCH_FILE;
85 ret = SSH2_FX_PERMISSION_DENIED;
89 ret = SSH2_FX_BAD_MESSAGE;
92 ret = SSH2_FX_FAILURE;
99 flags_from_portable(int pflags)
103 if ((pflags & SSH2_FXF_READ) &&
104 (pflags & SSH2_FXF_WRITE)) {
106 } else if (pflags & SSH2_FXF_READ) {
108 } else if (pflags & SSH2_FXF_WRITE) {
111 if (pflags & SSH2_FXF_CREAT)
113 if (pflags & SSH2_FXF_TRUNC)
115 if (pflags & SSH2_FXF_EXCL)
121 string_from_portable(int pflags)
123 static char ret[128];
127 #define PAPPEND(str) { \
129 strlcat(ret, ",", sizeof(ret)); \
130 strlcat(ret, str, sizeof(ret)); \
133 if (pflags & SSH2_FXF_READ)
135 if (pflags & SSH2_FXF_WRITE)
137 if (pflags & SSH2_FXF_CREAT)
139 if (pflags & SSH2_FXF_TRUNC)
141 if (pflags & SSH2_FXF_EXCL)
150 return decode_attrib(&iqueue);
155 typedef struct Handle Handle;
161 u_int64_t bytes_read, bytes_write;
177 for (i = 0; i < sizeof(handles)/sizeof(Handle); i++)
178 handles[i].use = HANDLE_UNUSED;
182 handle_new(int use, const char *name, int fd, DIR *dirp)
186 for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) {
187 if (handles[i].use == HANDLE_UNUSED) {
188 handles[i].use = use;
189 handles[i].dirp = dirp;
191 handles[i].name = xstrdup(name);
192 handles[i].bytes_read = handles[i].bytes_write = 0;
200 handle_is_ok(int i, int type)
202 return i >= 0 && (u_int)i < sizeof(handles)/sizeof(Handle) &&
203 handles[i].use == type;
207 handle_to_string(int handle, char **stringp, int *hlenp)
209 if (stringp == NULL || hlenp == NULL)
211 *stringp = xmalloc(sizeof(int32_t));
212 put_u32(*stringp, handle);
213 *hlenp = sizeof(int32_t);
218 handle_from_string(const char *handle, u_int hlen)
222 if (hlen != sizeof(int32_t))
224 val = get_u32(handle);
225 if (handle_is_ok(val, HANDLE_FILE) ||
226 handle_is_ok(val, HANDLE_DIR))
232 handle_to_name(int handle)
234 if (handle_is_ok(handle, HANDLE_DIR)||
235 handle_is_ok(handle, HANDLE_FILE))
236 return handles[handle].name;
241 handle_to_dir(int handle)
243 if (handle_is_ok(handle, HANDLE_DIR))
244 return handles[handle].dirp;
249 handle_to_fd(int handle)
251 if (handle_is_ok(handle, HANDLE_FILE))
252 return handles[handle].fd;
257 handle_update_read(int handle, ssize_t bytes)
259 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
260 handles[handle].bytes_read += bytes;
264 handle_update_write(int handle, ssize_t bytes)
266 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
267 handles[handle].bytes_write += bytes;
271 handle_bytes_read(int handle)
273 if (handle_is_ok(handle, HANDLE_FILE))
274 return (handles[handle].bytes_read);
279 handle_bytes_write(int handle)
281 if (handle_is_ok(handle, HANDLE_FILE))
282 return (handles[handle].bytes_write);
287 handle_close(int handle)
291 if (handle_is_ok(handle, HANDLE_FILE)) {
292 ret = close(handles[handle].fd);
293 handles[handle].use = HANDLE_UNUSED;
294 xfree(handles[handle].name);
295 } else if (handle_is_ok(handle, HANDLE_DIR)) {
296 ret = closedir(handles[handle].dirp);
297 handles[handle].use = HANDLE_UNUSED;
298 xfree(handles[handle].name);
306 handle_log_close(int handle, char *emsg)
308 if (handle_is_ok(handle, HANDLE_FILE)) {
309 logit("%s%sclose \"%s\" bytes read %llu written %llu",
310 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
311 handle_to_name(handle),
312 handle_bytes_read(handle), handle_bytes_write(handle));
314 logit("%s%sclosedir \"%s\"",
315 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
316 handle_to_name(handle));
321 handle_log_exit(void)
325 for (i = 0; i < sizeof(handles)/sizeof(Handle); i++)
326 if (handles[i].use != HANDLE_UNUSED)
327 handle_log_close(i, "forced");
337 handle = get_string(&hlen);
339 val = handle_from_string(handle, hlen);
349 int mlen = buffer_len(m);
351 buffer_put_int(&oqueue, mlen);
352 buffer_append(&oqueue, buffer_ptr(m), mlen);
353 buffer_consume(m, mlen);
357 status_to_message(u_int32_t status)
359 const char *status_messages[] = {
360 "Success", /* SSH_FX_OK */
361 "End of file", /* SSH_FX_EOF */
362 "No such file", /* SSH_FX_NO_SUCH_FILE */
363 "Permission denied", /* SSH_FX_PERMISSION_DENIED */
364 "Failure", /* SSH_FX_FAILURE */
365 "Bad message", /* SSH_FX_BAD_MESSAGE */
366 "No connection", /* SSH_FX_NO_CONNECTION */
367 "Connection lost", /* SSH_FX_CONNECTION_LOST */
368 "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
369 "Unknown error" /* Others */
371 return (status_messages[MIN(status,SSH2_FX_MAX)]);
375 send_status(u_int32_t id, u_int32_t status)
379 debug3("request %u: sent status %u", id, status);
380 if (log_level > SYSLOG_LEVEL_VERBOSE ||
381 (status != SSH2_FX_OK && status != SSH2_FX_EOF))
382 logit("sent status %s", status_to_message(status));
384 buffer_put_char(&msg, SSH2_FXP_STATUS);
385 buffer_put_int(&msg, id);
386 buffer_put_int(&msg, status);
388 buffer_put_cstring(&msg, status_to_message(status));
389 buffer_put_cstring(&msg, "");
395 send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
400 buffer_put_char(&msg, type);
401 buffer_put_int(&msg, id);
402 buffer_put_string(&msg, data, dlen);
408 send_data(u_int32_t id, const char *data, int dlen)
410 debug("request %u: sent data len %d", id, dlen);
411 send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
415 send_handle(u_int32_t id, int handle)
420 handle_to_string(handle, &string, &hlen);
421 debug("request %u: sent handle handle %d", id, handle);
422 send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
427 send_names(u_int32_t id, int count, const Stat *stats)
433 buffer_put_char(&msg, SSH2_FXP_NAME);
434 buffer_put_int(&msg, id);
435 buffer_put_int(&msg, count);
436 debug("request %u: sent names count %d", id, count);
437 for (i = 0; i < count; i++) {
438 buffer_put_cstring(&msg, stats[i].name);
439 buffer_put_cstring(&msg, stats[i].long_name);
440 encode_attrib(&msg, &stats[i].attrib);
447 send_attrib(u_int32_t id, const Attrib *a)
451 debug("request %u: sent attrib have 0x%x", id, a->flags);
453 buffer_put_char(&msg, SSH2_FXP_ATTRS);
454 buffer_put_int(&msg, id);
455 encode_attrib(&msg, a);
468 verbose("received client version %d", version);
470 buffer_put_char(&msg, SSH2_FXP_VERSION);
471 buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
479 u_int32_t id, pflags;
482 int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
485 name = get_string(NULL);
486 pflags = get_int(); /* portable flags */
487 debug3("request %u: open flags %d", id, pflags);
489 flags = flags_from_portable(pflags);
490 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
491 logit("open \"%s\" flags %s mode 0%o",
492 name, string_from_portable(pflags), mode);
493 fd = open(name, flags, mode);
495 status = errno_to_portable(errno);
497 handle = handle_new(HANDLE_FILE, name, fd, NULL);
501 send_handle(id, handle);
505 if (status != SSH2_FX_OK)
506 send_status(id, status);
514 int handle, ret, status = SSH2_FX_FAILURE;
517 handle = get_handle();
518 debug3("request %u: close handle %u", id, handle);
519 handle_log_close(handle, NULL);
520 ret = handle_close(handle);
521 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
522 send_status(id, status);
530 int handle, fd, ret, status = SSH2_FX_FAILURE;
534 handle = get_handle();
538 debug("request %u: read \"%s\" (handle %d) off %llu len %d",
539 id, handle_to_name(handle), handle, (unsigned long long)off, len);
540 if (len > sizeof buf) {
542 debug2("read change len %d", len);
544 fd = handle_to_fd(handle);
546 if (lseek(fd, off, SEEK_SET) < 0) {
547 error("process_read: seek failed");
548 status = errno_to_portable(errno);
550 ret = read(fd, buf, len);
552 status = errno_to_portable(errno);
553 } else if (ret == 0) {
554 status = SSH2_FX_EOF;
556 send_data(id, buf, ret);
558 handle_update_read(handle, ret);
562 if (status != SSH2_FX_OK)
563 send_status(id, status);
572 int handle, fd, ret, status = SSH2_FX_FAILURE;
576 handle = get_handle();
578 data = get_string(&len);
580 debug("request %u: write \"%s\" (handle %d) off %llu len %d",
581 id, handle_to_name(handle), handle, (unsigned long long)off, len);
582 fd = handle_to_fd(handle);
584 if (lseek(fd, off, SEEK_SET) < 0) {
585 status = errno_to_portable(errno);
586 error("process_write: seek failed");
589 ret = write(fd, data, len);
591 error("process_write: write failed");
592 status = errno_to_portable(errno);
593 } else if ((size_t)ret == len) {
595 handle_update_write(handle, ret);
597 debug2("nothing at all written");
601 send_status(id, status);
606 process_do_stat(int do_lstat)
612 int ret, status = SSH2_FX_FAILURE;
615 name = get_string(NULL);
616 debug3("request %u: %sstat", id, do_lstat ? "l" : "");
617 verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
618 ret = do_lstat ? lstat(name, &st) : stat(name, &st);
620 status = errno_to_portable(errno);
622 stat_to_attrib(&st, &a);
626 if (status != SSH2_FX_OK)
627 send_status(id, status);
649 int fd, ret, handle, status = SSH2_FX_FAILURE;
652 handle = get_handle();
653 debug("request %u: fstat \"%s\" (handle %u)",
654 id, handle_to_name(handle), handle);
655 fd = handle_to_fd(handle);
657 ret = fstat(fd, &st);
659 status = errno_to_portable(errno);
661 stat_to_attrib(&st, &a);
666 if (status != SSH2_FX_OK)
667 send_status(id, status);
670 static struct timeval *
671 attrib_to_tv(const Attrib *a)
673 static struct timeval tv[2];
675 tv[0].tv_sec = a->atime;
677 tv[1].tv_sec = a->mtime;
683 process_setstat(void)
688 int status = SSH2_FX_OK, ret;
691 name = get_string(NULL);
693 debug("request %u: setstat name \"%s\"", id, name);
694 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
695 logit("set \"%s\" size %llu", name, a->size);
696 ret = truncate(name, a->size);
698 status = errno_to_portable(errno);
700 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
701 logit("set \"%s\" mode %04o", name, a->perm);
702 ret = chmod(name, a->perm & 0777);
704 status = errno_to_portable(errno);
706 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
710 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
712 logit("set \"%s\" modtime %s", name, buf);
713 ret = utimes(name, attrib_to_tv(a));
715 status = errno_to_portable(errno);
717 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
718 logit("set \"%s\" owner %lu group %lu", name,
719 (u_long)a->uid, (u_long)a->gid);
720 ret = chown(name, a->uid, a->gid);
722 status = errno_to_portable(errno);
724 send_status(id, status);
729 process_fsetstat(void)
734 int status = SSH2_FX_OK;
737 handle = get_handle();
739 debug("request %u: fsetstat handle %d", id, handle);
740 fd = handle_to_fd(handle);
742 status = SSH2_FX_FAILURE;
744 char *name = handle_to_name(handle);
746 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
747 logit("set \"%s\" size %llu", name, a->size);
748 ret = ftruncate(fd, a->size);
750 status = errno_to_portable(errno);
752 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
753 logit("set \"%s\" mode %04o", name, a->perm);
755 ret = fchmod(fd, a->perm & 0777);
757 ret = chmod(name, a->perm & 0777);
760 status = errno_to_portable(errno);
762 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
766 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
768 logit("set \"%s\" modtime %s", name, buf);
770 ret = futimes(fd, attrib_to_tv(a));
772 ret = utimes(name, attrib_to_tv(a));
775 status = errno_to_portable(errno);
777 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
778 logit("set \"%s\" owner %lu group %lu", name,
779 (u_long)a->uid, (u_long)a->gid);
781 ret = fchown(fd, a->uid, a->gid);
783 ret = chown(name, a->uid, a->gid);
786 status = errno_to_portable(errno);
789 send_status(id, status);
793 process_opendir(void)
797 int handle, status = SSH2_FX_FAILURE;
801 path = get_string(NULL);
802 debug3("request %u: opendir", id);
803 logit("opendir \"%s\"", path);
804 dirp = opendir(path);
806 status = errno_to_portable(errno);
808 handle = handle_new(HANDLE_DIR, path, 0, dirp);
812 send_handle(id, handle);
817 if (status != SSH2_FX_OK)
818 send_status(id, status);
823 process_readdir(void)
832 handle = get_handle();
833 debug("request %u: readdir \"%s\" (handle %d)", id,
834 handle_to_name(handle), handle);
835 dirp = handle_to_dir(handle);
836 path = handle_to_name(handle);
837 if (dirp == NULL || path == NULL) {
838 send_status(id, SSH2_FX_FAILURE);
841 char pathname[MAXPATHLEN];
843 int nstats = 10, count = 0, i;
845 stats = xcalloc(nstats, sizeof(Stat));
846 while ((dp = readdir(dirp)) != NULL) {
847 if (count >= nstats) {
849 stats = xrealloc(stats, nstats, sizeof(Stat));
852 snprintf(pathname, sizeof pathname, "%s%s%s", path,
853 strcmp(path, "/") ? "/" : "", dp->d_name);
854 if (lstat(pathname, &st) < 0)
856 stat_to_attrib(&st, &(stats[count].attrib));
857 stats[count].name = xstrdup(dp->d_name);
858 stats[count].long_name = ls_file(dp->d_name, &st, 0);
860 /* send up to 100 entries in one message */
861 /* XXX check packet size instead */
866 send_names(id, count, stats);
867 for (i = 0; i < count; i++) {
868 xfree(stats[i].name);
869 xfree(stats[i].long_name);
872 send_status(id, SSH2_FX_EOF);
883 int status = SSH2_FX_FAILURE;
887 name = get_string(NULL);
888 debug3("request %u: remove", id);
889 logit("remove name \"%s\"", name);
891 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
892 send_status(id, status);
902 int ret, mode, status = SSH2_FX_FAILURE;
905 name = get_string(NULL);
907 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
908 a->perm & 0777 : 0777;
909 debug3("request %u: mkdir", id);
910 logit("mkdir name \"%s\" mode 0%o", name, mode);
911 ret = mkdir(name, mode);
912 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
913 send_status(id, status);
925 name = get_string(NULL);
926 debug3("request %u: rmdir", id);
927 logit("rmdir name \"%s\"", name);
929 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
930 send_status(id, status);
935 process_realpath(void)
937 char resolvedname[MAXPATHLEN];
942 path = get_string(NULL);
943 if (path[0] == '\0') {
947 debug3("request %u: realpath", id);
948 verbose("realpath \"%s\"", path);
949 if (realpath(path, resolvedname) == NULL) {
950 send_status(id, errno_to_portable(errno));
953 attrib_clear(&s.attrib);
954 s.name = s.long_name = resolvedname;
955 send_names(id, 1, &s);
964 char *oldpath, *newpath;
969 oldpath = get_string(NULL);
970 newpath = get_string(NULL);
971 debug3("request %u: rename", id);
972 logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
973 status = SSH2_FX_FAILURE;
974 if (lstat(oldpath, &sb) == -1)
975 status = errno_to_portable(errno);
976 else if (S_ISREG(sb.st_mode)) {
977 /* Race-free rename of regular files */
978 if (link(oldpath, newpath) == -1) {
979 if (errno == EOPNOTSUPP
980 #ifdef LINK_OPNOTSUPP_ERRNO
981 || errno == LINK_OPNOTSUPP_ERRNO
987 * fs doesn't support links, so fall back to
988 * stat+rename. This is racy.
990 if (stat(newpath, &st) == -1) {
991 if (rename(oldpath, newpath) == -1)
993 errno_to_portable(errno);
998 status = errno_to_portable(errno);
1000 } else if (unlink(oldpath) == -1) {
1001 status = errno_to_portable(errno);
1002 /* clean spare link */
1005 status = SSH2_FX_OK;
1006 } else if (stat(newpath, &sb) == -1) {
1007 if (rename(oldpath, newpath) == -1)
1008 status = errno_to_portable(errno);
1010 status = SSH2_FX_OK;
1012 send_status(id, status);
1018 process_readlink(void)
1022 char buf[MAXPATHLEN];
1026 path = get_string(NULL);
1027 debug3("request %u: readlink", id);
1028 verbose("readlink \"%s\"", path);
1029 if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1030 send_status(id, errno_to_portable(errno));
1035 attrib_clear(&s.attrib);
1036 s.name = s.long_name = buf;
1037 send_names(id, 1, &s);
1043 process_symlink(void)
1046 char *oldpath, *newpath;
1050 oldpath = get_string(NULL);
1051 newpath = get_string(NULL);
1052 debug3("request %u: symlink", id);
1053 logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1054 /* this will fail if 'newpath' exists */
1055 ret = symlink(oldpath, newpath);
1056 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1057 send_status(id, status);
1063 process_extended(void)
1069 request = get_string(NULL);
1070 send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1074 /* stolen from ssh-agent */
1085 buf_len = buffer_len(&iqueue);
1087 return; /* Incomplete message. */
1088 cp = buffer_ptr(&iqueue);
1089 msg_len = get_u32(cp);
1090 if (msg_len > SFTP_MAX_MSG_LENGTH) {
1091 error("bad message from %s local user %s",
1092 client_addr, pw->pw_name);
1095 if (buf_len < msg_len + 4)
1097 buffer_consume(&iqueue, 4);
1099 type = buffer_get_char(&iqueue);
1107 case SSH2_FXP_CLOSE:
1113 case SSH2_FXP_WRITE:
1116 case SSH2_FXP_LSTAT:
1119 case SSH2_FXP_FSTAT:
1122 case SSH2_FXP_SETSTAT:
1125 case SSH2_FXP_FSETSTAT:
1128 case SSH2_FXP_OPENDIR:
1131 case SSH2_FXP_READDIR:
1134 case SSH2_FXP_REMOVE:
1137 case SSH2_FXP_MKDIR:
1140 case SSH2_FXP_RMDIR:
1143 case SSH2_FXP_REALPATH:
1149 case SSH2_FXP_RENAME:
1152 case SSH2_FXP_READLINK:
1155 case SSH2_FXP_SYMLINK:
1158 case SSH2_FXP_EXTENDED:
1162 error("Unknown message %d", type);
1165 /* discard the remaining bytes from the current packet */
1166 if (buf_len < buffer_len(&iqueue))
1167 fatal("iqueue grew unexpectedly");
1168 consumed = buf_len - buffer_len(&iqueue);
1169 if (msg_len < consumed)
1170 fatal("msg_len %d < consumed %d", msg_len, consumed);
1171 if (msg_len > consumed)
1172 buffer_consume(&iqueue, msg_len - consumed);
1175 /* Cleanup handler that logs active handles upon normal exit */
1179 if (pw != NULL && client_addr != NULL) {
1181 logit("session closed for local user %s from [%s]",
1182 pw->pw_name, client_addr);
1190 extern char *__progname;
1193 "usage: %s [-he] [-l log_level] [-f log_facility]\n", __progname);
1198 main(int argc, char **argv)
1200 fd_set *rset, *wset;
1201 int in, out, max, ch, skipargs = 0, log_stderr = 0;
1202 ssize_t len, olen, set_size;
1203 SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1206 extern char *optarg;
1207 extern char *__progname;
1209 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1212 __progname = ssh_get_progname(argv[0]);
1213 log_init(__progname, log_level, log_facility, log_stderr);
1215 while (!skipargs && (ch = getopt(argc, argv, "C:f:l:che")) != -1) {
1219 * Ignore all arguments if we are invoked as a
1220 * shell using "sftp-server -c command"
1228 log_level = log_level_number(optarg);
1229 if (log_level == SYSLOG_LEVEL_NOT_SET)
1230 error("Invalid log level \"%s\"", optarg);
1233 log_facility = log_facility_number(optarg);
1234 if (log_level == SYSLOG_FACILITY_NOT_SET)
1235 error("Invalid log facility \"%s\"", optarg);
1243 log_init(__progname, log_level, log_facility, log_stderr);
1245 if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1246 client_addr = xstrdup(cp);
1247 if ((cp = strchr(client_addr, ' ')) == NULL)
1248 fatal("Malformed SSH_CONNECTION variable: \"%s\"",
1249 getenv("SSH_CONNECTION"));
1252 client_addr = xstrdup("UNKNOWN");
1254 if ((pw = getpwuid(getuid())) == NULL)
1255 fatal("No user found for uid %lu", (u_long)getuid());
1258 logit("session opened for local user %s from [%s]",
1259 pw->pw_name, client_addr);
1263 in = dup(STDIN_FILENO);
1264 out = dup(STDOUT_FILENO);
1267 setmode(in, O_BINARY);
1268 setmode(out, O_BINARY);
1277 buffer_init(&iqueue);
1278 buffer_init(&oqueue);
1280 set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1281 rset = (fd_set *)xmalloc(set_size);
1282 wset = (fd_set *)xmalloc(set_size);
1285 memset(rset, 0, set_size);
1286 memset(wset, 0, set_size);
1289 olen = buffer_len(&oqueue);
1293 if (select(max+1, rset, wset, NULL, NULL) < 0) {
1296 error("select: %s", strerror(errno));
1300 /* copy stdin to iqueue */
1301 if (FD_ISSET(in, rset)) {
1303 len = read(in, buf, sizeof buf);
1307 } else if (len < 0) {
1308 error("read: %s", strerror(errno));
1311 buffer_append(&iqueue, buf, len);
1314 /* send oqueue to stdout */
1315 if (FD_ISSET(out, wset)) {
1316 len = write(out, buffer_ptr(&oqueue), olen);
1318 error("write: %s", strerror(errno));
1321 buffer_consume(&oqueue, len);
1324 /* process requests from client */