Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.111
1.111 ! djm 1: /* $OpenBSD: sftp-server.c,v 1.110 2016/09/12 01:22:38 deraadt Exp $ */
1.1 markus 2: /*
1.45 markus 3: * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
1.1 markus 4: *
1.45 markus 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.
1.1 markus 8: *
1.45 markus 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.
1.1 markus 16: */
1.52 stevesk 17:
18: #include <sys/types.h>
19: #include <sys/stat.h>
1.66 stevesk 20: #include <sys/time.h>
1.79 djm 21: #include <sys/mount.h>
22: #include <sys/statvfs.h>
1.51 stevesk 23:
24: #include <dirent.h>
1.62 stevesk 25: #include <errno.h>
1.59 stevesk 26: #include <fcntl.h>
1.68 stevesk 27: #include <stdlib.h>
1.69 stevesk 28: #include <stdio.h>
1.65 stevesk 29: #include <string.h>
1.70 deraadt 30: #include <pwd.h>
1.64 stevesk 31: #include <time.h>
1.63 stevesk 32: #include <unistd.h>
1.70 deraadt 33: #include <stdarg.h>
1.1 markus 34:
1.70 deraadt 35: #include "xmalloc.h"
1.104 djm 36: #include "sshbuf.h"
37: #include "ssherr.h"
1.14 markus 38: #include "log.h"
1.49 djm 39: #include "misc.h"
1.98 djm 40: #include "match.h"
1.58 djm 41: #include "uidswap.h"
1.1 markus 42:
1.10 markus 43: #include "sftp.h"
1.15 djm 44: #include "sftp-common.h"
1.1 markus 45:
1.58 djm 46: /* Our verbosity */
1.98 djm 47: static LogLevel log_level = SYSLOG_LEVEL_ERROR;
1.58 djm 48:
49: /* Our client */
1.98 djm 50: static struct passwd *pw = NULL;
51: static char *client_addr = NULL;
1.1 markus 52:
53: /* input and output queue */
1.104 djm 54: struct sshbuf *iqueue;
55: struct sshbuf *oqueue;
1.1 markus 56:
1.23 djm 57: /* Version of client */
1.98 djm 58: static u_int version;
59:
60: /* SSH2_FXP_INIT received */
61: static int init_done;
1.23 djm 62:
1.90 djm 63: /* Disable writes */
1.98 djm 64: static int readonly;
65:
66: /* Requests that are allowed/denied */
67: static char *request_whitelist, *request_blacklist;
1.90 djm 68:
1.43 miod 69: /* portable attributes, etc. */
1.1 markus 70: typedef struct Stat Stat;
71:
1.15 djm 72: struct Stat {
1.1 markus 73: char *name;
74: char *long_name;
75: Attrib attrib;
76: };
77:
1.98 djm 78: /* Packet handlers */
79: static void process_open(u_int32_t id);
80: static void process_close(u_int32_t id);
81: static void process_read(u_int32_t id);
82: static void process_write(u_int32_t id);
83: static void process_stat(u_int32_t id);
84: static void process_lstat(u_int32_t id);
85: static void process_fstat(u_int32_t id);
86: static void process_setstat(u_int32_t id);
87: static void process_fsetstat(u_int32_t id);
88: static void process_opendir(u_int32_t id);
89: static void process_readdir(u_int32_t id);
90: static void process_remove(u_int32_t id);
91: static void process_mkdir(u_int32_t id);
92: static void process_rmdir(u_int32_t id);
93: static void process_realpath(u_int32_t id);
94: static void process_rename(u_int32_t id);
95: static void process_readlink(u_int32_t id);
96: static void process_symlink(u_int32_t id);
97: static void process_extended_posix_rename(u_int32_t id);
98: static void process_extended_statvfs(u_int32_t id);
99: static void process_extended_fstatvfs(u_int32_t id);
100: static void process_extended_hardlink(u_int32_t id);
1.102 djm 101: static void process_extended_fsync(u_int32_t id);
1.98 djm 102: static void process_extended(u_int32_t id);
103:
104: struct sftp_handler {
105: const char *name; /* user-visible name for fine-grained perms */
106: const char *ext_name; /* extended request name */
107: u_int type; /* packet type, for non extended packets */
108: void (*handler)(u_int32_t);
109: int does_write; /* if nonzero, banned for readonly mode */
110: };
111:
112: struct sftp_handler handlers[] = {
113: /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
114: { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
115: { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
116: { "read", NULL, SSH2_FXP_READ, process_read, 0 },
117: { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
118: { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
119: { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
120: { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
121: { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
122: { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
123: { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
124: { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
125: { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
126: { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
127: { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
128: { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
129: { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
130: { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
131: { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
132: { NULL, NULL, 0, NULL, 0 }
133: };
134:
135: /* SSH2_FXP_EXTENDED submessages */
136: struct sftp_handler extended_handlers[] = {
137: { "posix-rename", "posix-rename@openssh.com", 0,
138: process_extended_posix_rename, 1 },
139: { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
140: { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
141: { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
1.102 djm 142: { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
1.98 djm 143: { NULL, NULL, 0, NULL, 0 }
144: };
145:
146: static int
147: request_permitted(struct sftp_handler *h)
148: {
149: char *result;
150:
151: if (readonly && h->does_write) {
152: verbose("Refusing %s request in read-only mode", h->name);
153: return 0;
154: }
155: if (request_blacklist != NULL &&
156: ((result = match_list(h->name, request_blacklist, NULL))) != NULL) {
157: free(result);
158: verbose("Refusing blacklisted %s request", h->name);
159: return 0;
160: }
161: if (request_whitelist != NULL &&
162: ((result = match_list(h->name, request_whitelist, NULL))) != NULL) {
163: free(result);
164: debug2("Permitting whitelisted %s request", h->name);
165: return 1;
166: }
167: if (request_whitelist != NULL) {
168: verbose("Refusing non-whitelisted %s request", h->name);
169: return 0;
170: }
171: return 1;
172: }
173:
1.28 itojun 174: static int
1.2 markus 175: errno_to_portable(int unixerrno)
1.1 markus 176: {
177: int ret = 0;
1.22 deraadt 178:
1.2 markus 179: switch (unixerrno) {
1.1 markus 180: case 0:
1.10 markus 181: ret = SSH2_FX_OK;
1.1 markus 182: break;
183: case ENOENT:
184: case ENOTDIR:
185: case EBADF:
186: case ELOOP:
1.10 markus 187: ret = SSH2_FX_NO_SUCH_FILE;
1.1 markus 188: break;
189: case EPERM:
190: case EACCES:
191: case EFAULT:
1.10 markus 192: ret = SSH2_FX_PERMISSION_DENIED;
1.1 markus 193: break;
194: case ENAMETOOLONG:
195: case EINVAL:
1.10 markus 196: ret = SSH2_FX_BAD_MESSAGE;
1.82 dtucker 197: break;
198: case ENOSYS:
199: ret = SSH2_FX_OP_UNSUPPORTED;
1.1 markus 200: break;
201: default:
1.10 markus 202: ret = SSH2_FX_FAILURE;
1.1 markus 203: break;
204: }
205: return ret;
206: }
207:
1.28 itojun 208: static int
1.1 markus 209: flags_from_portable(int pflags)
210: {
211: int flags = 0;
1.22 deraadt 212:
1.20 deraadt 213: if ((pflags & SSH2_FXF_READ) &&
214: (pflags & SSH2_FXF_WRITE)) {
1.1 markus 215: flags = O_RDWR;
1.10 markus 216: } else if (pflags & SSH2_FXF_READ) {
1.1 markus 217: flags = O_RDONLY;
1.10 markus 218: } else if (pflags & SSH2_FXF_WRITE) {
1.1 markus 219: flags = O_WRONLY;
220: }
1.101 djm 221: if (pflags & SSH2_FXF_APPEND)
222: flags |= O_APPEND;
1.10 markus 223: if (pflags & SSH2_FXF_CREAT)
1.1 markus 224: flags |= O_CREAT;
1.10 markus 225: if (pflags & SSH2_FXF_TRUNC)
1.1 markus 226: flags |= O_TRUNC;
1.10 markus 227: if (pflags & SSH2_FXF_EXCL)
1.1 markus 228: flags |= O_EXCL;
229: return flags;
230: }
231:
1.58 djm 232: static const char *
233: string_from_portable(int pflags)
234: {
235: static char ret[128];
236:
237: *ret = '\0';
238:
239: #define PAPPEND(str) { \
240: if (*ret != '\0') \
241: strlcat(ret, ",", sizeof(ret)); \
1.70 deraadt 242: strlcat(ret, str, sizeof(ret)); \
1.58 djm 243: }
244:
245: if (pflags & SSH2_FXF_READ)
246: PAPPEND("READ")
247: if (pflags & SSH2_FXF_WRITE)
248: PAPPEND("WRITE")
1.101 djm 249: if (pflags & SSH2_FXF_APPEND)
250: PAPPEND("APPEND")
1.58 djm 251: if (pflags & SSH2_FXF_CREAT)
252: PAPPEND("CREATE")
253: if (pflags & SSH2_FXF_TRUNC)
254: PAPPEND("TRUNCATE")
255: if (pflags & SSH2_FXF_EXCL)
256: PAPPEND("EXCL")
257:
258: return ret;
259: }
260:
1.1 markus 261: /* handle handles */
262:
263: typedef struct Handle Handle;
264: struct Handle {
265: int use;
266: DIR *dirp;
267: int fd;
1.101 djm 268: int flags;
1.1 markus 269: char *name;
1.58 djm 270: u_int64_t bytes_read, bytes_write;
1.75 djm 271: int next_unused;
1.1 markus 272: };
1.22 deraadt 273:
1.1 markus 274: enum {
275: HANDLE_UNUSED,
276: HANDLE_DIR,
277: HANDLE_FILE
278: };
1.22 deraadt 279:
1.75 djm 280: Handle *handles = NULL;
281: u_int num_handles = 0;
282: int first_unused_handle = -1;
283:
284: static void handle_unused(int i)
285: {
286: handles[i].use = HANDLE_UNUSED;
287: handles[i].next_unused = first_unused_handle;
288: first_unused_handle = i;
1.1 markus 289: }
290:
1.28 itojun 291: static int
1.101 djm 292: handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
1.1 markus 293: {
1.75 djm 294: int i;
295:
296: if (first_unused_handle == -1) {
297: if (num_handles + 1 <= num_handles)
298: return -1;
299: num_handles++;
1.106 deraadt 300: handles = xreallocarray(handles, num_handles, sizeof(Handle));
1.75 djm 301: handle_unused(num_handles - 1);
302: }
303:
304: i = first_unused_handle;
305: first_unused_handle = handles[i].next_unused;
306:
307: handles[i].use = use;
308: handles[i].dirp = dirp;
309: handles[i].fd = fd;
1.101 djm 310: handles[i].flags = flags;
1.75 djm 311: handles[i].name = xstrdup(name);
312: handles[i].bytes_read = handles[i].bytes_write = 0;
1.22 deraadt 313:
1.75 djm 314: return i;
1.1 markus 315: }
316:
1.28 itojun 317: static int
1.1 markus 318: handle_is_ok(int i, int type)
319: {
1.75 djm 320: return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
1.1 markus 321: }
322:
1.28 itojun 323: static int
1.104 djm 324: handle_to_string(int handle, u_char **stringp, int *hlenp)
1.1 markus 325: {
326: if (stringp == NULL || hlenp == NULL)
327: return -1;
1.13 markus 328: *stringp = xmalloc(sizeof(int32_t));
1.57 djm 329: put_u32(*stringp, handle);
1.13 markus 330: *hlenp = sizeof(int32_t);
1.1 markus 331: return 0;
332: }
333:
1.28 itojun 334: static int
1.104 djm 335: handle_from_string(const u_char *handle, u_int hlen)
1.1 markus 336: {
1.13 markus 337: int val;
1.22 deraadt 338:
1.13 markus 339: if (hlen != sizeof(int32_t))
1.1 markus 340: return -1;
1.57 djm 341: val = get_u32(handle);
1.1 markus 342: if (handle_is_ok(val, HANDLE_FILE) ||
343: handle_is_ok(val, HANDLE_DIR))
344: return val;
345: return -1;
346: }
347:
1.28 itojun 348: static char *
1.1 markus 349: handle_to_name(int handle)
350: {
351: if (handle_is_ok(handle, HANDLE_DIR)||
352: handle_is_ok(handle, HANDLE_FILE))
353: return handles[handle].name;
354: return NULL;
355: }
356:
1.28 itojun 357: static DIR *
1.1 markus 358: handle_to_dir(int handle)
359: {
360: if (handle_is_ok(handle, HANDLE_DIR))
361: return handles[handle].dirp;
362: return NULL;
363: }
364:
1.28 itojun 365: static int
1.1 markus 366: handle_to_fd(int handle)
367: {
1.17 stevesk 368: if (handle_is_ok(handle, HANDLE_FILE))
1.1 markus 369: return handles[handle].fd;
370: return -1;
371: }
372:
1.101 djm 373: static int
374: handle_to_flags(int handle)
375: {
376: if (handle_is_ok(handle, HANDLE_FILE))
377: return handles[handle].flags;
378: return 0;
379: }
380:
1.58 djm 381: static void
382: handle_update_read(int handle, ssize_t bytes)
383: {
384: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
385: handles[handle].bytes_read += bytes;
386: }
387:
388: static void
389: handle_update_write(int handle, ssize_t bytes)
390: {
391: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
392: handles[handle].bytes_write += bytes;
393: }
394:
395: static u_int64_t
396: handle_bytes_read(int handle)
397: {
398: if (handle_is_ok(handle, HANDLE_FILE))
399: return (handles[handle].bytes_read);
400: return 0;
401: }
402:
403: static u_int64_t
404: handle_bytes_write(int handle)
405: {
406: if (handle_is_ok(handle, HANDLE_FILE))
407: return (handles[handle].bytes_write);
408: return 0;
409: }
410:
1.28 itojun 411: static int
1.1 markus 412: handle_close(int handle)
413: {
414: int ret = -1;
1.22 deraadt 415:
1.1 markus 416: if (handle_is_ok(handle, HANDLE_FILE)) {
417: ret = close(handles[handle].fd);
1.97 djm 418: free(handles[handle].name);
1.75 djm 419: handle_unused(handle);
1.1 markus 420: } else if (handle_is_ok(handle, HANDLE_DIR)) {
421: ret = closedir(handles[handle].dirp);
1.97 djm 422: free(handles[handle].name);
1.75 djm 423: handle_unused(handle);
1.1 markus 424: } else {
425: errno = ENOENT;
426: }
427: return ret;
428: }
429:
1.58 djm 430: static void
431: handle_log_close(int handle, char *emsg)
432: {
433: if (handle_is_ok(handle, HANDLE_FILE)) {
434: logit("%s%sclose \"%s\" bytes read %llu written %llu",
435: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
436: handle_to_name(handle),
1.72 stevesk 437: (unsigned long long)handle_bytes_read(handle),
438: (unsigned long long)handle_bytes_write(handle));
1.58 djm 439: } else {
440: logit("%s%sclosedir \"%s\"",
441: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
442: handle_to_name(handle));
443: }
444: }
445:
446: static void
447: handle_log_exit(void)
448: {
449: u_int i;
450:
1.75 djm 451: for (i = 0; i < num_handles; i++)
1.58 djm 452: if (handles[i].use != HANDLE_UNUSED)
453: handle_log_close(i, "forced");
454: }
455:
1.28 itojun 456: static int
1.104 djm 457: get_handle(struct sshbuf *queue, int *hp)
1.1 markus 458: {
1.104 djm 459: u_char *handle;
460: int r;
461: size_t hlen;
462:
463: *hp = -1;
464: if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
465: return r;
1.10 markus 466: if (hlen < 256)
1.104 djm 467: *hp = handle_from_string(handle, hlen);
1.97 djm 468: free(handle);
1.104 djm 469: return 0;
1.1 markus 470: }
471:
472: /* send replies */
473:
1.28 itojun 474: static void
1.104 djm 475: send_msg(struct sshbuf *m)
1.1 markus 476: {
1.104 djm 477: int r;
1.22 deraadt 478:
1.104 djm 479: if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
480: fatal("%s: buffer error: %s", __func__, ssh_err(r));
481: sshbuf_reset(m);
1.1 markus 482: }
483:
1.58 djm 484: static const char *
485: status_to_message(u_int32_t status)
1.1 markus 486: {
1.23 djm 487: const char *status_messages[] = {
488: "Success", /* SSH_FX_OK */
489: "End of file", /* SSH_FX_EOF */
490: "No such file", /* SSH_FX_NO_SUCH_FILE */
491: "Permission denied", /* SSH_FX_PERMISSION_DENIED */
492: "Failure", /* SSH_FX_FAILURE */
493: "Bad message", /* SSH_FX_BAD_MESSAGE */
494: "No connection", /* SSH_FX_NO_CONNECTION */
495: "Connection lost", /* SSH_FX_CONNECTION_LOST */
496: "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
497: "Unknown error" /* Others */
498: };
1.110 deraadt 499: return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
1.58 djm 500: }
1.22 deraadt 501:
1.58 djm 502: static void
503: send_status(u_int32_t id, u_int32_t status)
504: {
1.104 djm 505: struct sshbuf *msg;
506: int r;
1.58 djm 507:
508: debug3("request %u: sent status %u", id, status);
509: if (log_level > SYSLOG_LEVEL_VERBOSE ||
510: (status != SSH2_FX_OK && status != SSH2_FX_EOF))
511: logit("sent status %s", status_to_message(status));
1.104 djm 512: if ((msg = sshbuf_new()) == NULL)
513: fatal("%s: sshbuf_new failed", __func__);
514: if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
515: (r = sshbuf_put_u32(msg, id)) != 0 ||
516: (r = sshbuf_put_u32(msg, status)) != 0)
517: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.23 djm 518: if (version >= 3) {
1.104 djm 519: if ((r = sshbuf_put_cstring(msg,
520: status_to_message(status))) != 0 ||
521: (r = sshbuf_put_cstring(msg, "")) != 0)
522: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.23 djm 523: }
1.104 djm 524: send_msg(msg);
525: sshbuf_free(msg);
1.1 markus 526: }
1.28 itojun 527: static void
1.104 djm 528: send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
1.1 markus 529: {
1.104 djm 530: struct sshbuf *msg;
531: int r;
1.22 deraadt 532:
1.104 djm 533: if ((msg = sshbuf_new()) == NULL)
534: fatal("%s: sshbuf_new failed", __func__);
535: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
536: (r = sshbuf_put_u32(msg, id)) != 0 ||
537: (r = sshbuf_put_string(msg, data, dlen)) != 0)
538: fatal("%s: buffer error: %s", __func__, ssh_err(r));
539: send_msg(msg);
540: sshbuf_free(msg);
1.1 markus 541: }
542:
1.28 itojun 543: static void
1.104 djm 544: send_data(u_int32_t id, const u_char *data, int dlen)
1.1 markus 545: {
1.58 djm 546: debug("request %u: sent data len %d", id, dlen);
1.10 markus 547: send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
1.1 markus 548: }
549:
1.28 itojun 550: static void
1.1 markus 551: send_handle(u_int32_t id, int handle)
552: {
1.104 djm 553: u_char *string;
1.1 markus 554: int hlen;
1.22 deraadt 555:
1.1 markus 556: handle_to_string(handle, &string, &hlen);
1.58 djm 557: debug("request %u: sent handle handle %d", id, handle);
1.10 markus 558: send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
1.97 djm 559: free(string);
1.1 markus 560: }
561:
1.28 itojun 562: static void
1.44 jakob 563: send_names(u_int32_t id, int count, const Stat *stats)
1.1 markus 564: {
1.104 djm 565: struct sshbuf *msg;
566: int i, r;
1.22 deraadt 567:
1.104 djm 568: if ((msg = sshbuf_new()) == NULL)
569: fatal("%s: sshbuf_new failed", __func__);
570: if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
571: (r = sshbuf_put_u32(msg, id)) != 0 ||
572: (r = sshbuf_put_u32(msg, count)) != 0)
573: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.58 djm 574: debug("request %u: sent names count %d", id, count);
1.1 markus 575: for (i = 0; i < count; i++) {
1.104 djm 576: if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
577: (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
578: (r = encode_attrib(msg, &stats[i].attrib)) != 0)
579: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 580: }
1.104 djm 581: send_msg(msg);
582: sshbuf_free(msg);
1.1 markus 583: }
584:
1.28 itojun 585: static void
1.44 jakob 586: send_attrib(u_int32_t id, const Attrib *a)
1.1 markus 587: {
1.104 djm 588: struct sshbuf *msg;
589: int r;
1.22 deraadt 590:
1.58 djm 591: debug("request %u: sent attrib have 0x%x", id, a->flags);
1.104 djm 592: if ((msg = sshbuf_new()) == NULL)
593: fatal("%s: sshbuf_new failed", __func__);
594: if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
595: (r = sshbuf_put_u32(msg, id)) != 0 ||
596: (r = encode_attrib(msg, a)) != 0)
597: fatal("%s: buffer error: %s", __func__, ssh_err(r));
598: send_msg(msg);
599: sshbuf_free(msg);
1.1 markus 600: }
601:
1.79 djm 602: static void
603: send_statvfs(u_int32_t id, struct statvfs *st)
604: {
1.104 djm 605: struct sshbuf *msg;
1.79 djm 606: u_int64_t flag;
1.104 djm 607: int r;
1.79 djm 608:
609: flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
610: flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
611:
1.104 djm 612: if ((msg = sshbuf_new()) == NULL)
613: fatal("%s: sshbuf_new failed", __func__);
614: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
615: (r = sshbuf_put_u32(msg, id)) != 0 ||
616: (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
617: (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
618: (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
619: (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
620: (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
621: (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
622: (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
623: (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
624: (r = sshbuf_put_u64(msg, st->f_fsid)) != 0 ||
625: (r = sshbuf_put_u64(msg, flag)) != 0 ||
626: (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
627: fatal("%s: buffer error: %s", __func__, ssh_err(r));
628: send_msg(msg);
629: sshbuf_free(msg);
1.79 djm 630: }
631:
1.1 markus 632: /* parse incoming */
633:
1.28 itojun 634: static void
1.1 markus 635: process_init(void)
636: {
1.104 djm 637: struct sshbuf *msg;
638: int r;
1.1 markus 639:
1.104 djm 640: if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
641: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.94 djm 642: verbose("received client version %u", version);
1.104 djm 643: if ((msg = sshbuf_new()) == NULL)
644: fatal("%s: sshbuf_new failed", __func__);
645: if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
646: (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0 ||
647: /* POSIX rename extension */
648: (r = sshbuf_put_cstring(msg, "posix-rename@openssh.com")) != 0 ||
649: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
650: /* statvfs extension */
651: (r = sshbuf_put_cstring(msg, "statvfs@openssh.com")) != 0 ||
652: (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
653: /* fstatvfs extension */
654: (r = sshbuf_put_cstring(msg, "fstatvfs@openssh.com")) != 0 ||
655: (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
656: /* hardlink extension */
657: (r = sshbuf_put_cstring(msg, "hardlink@openssh.com")) != 0 ||
658: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
659: /* fsync extension */
660: (r = sshbuf_put_cstring(msg, "fsync@openssh.com")) != 0 ||
661: (r = sshbuf_put_cstring(msg, "1")) != 0) /* version */
662: fatal("%s: buffer error: %s", __func__, ssh_err(r));
663: send_msg(msg);
664: sshbuf_free(msg);
1.1 markus 665: }
666:
1.28 itojun 667: static void
1.98 djm 668: process_open(u_int32_t id)
1.1 markus 669: {
1.98 djm 670: u_int32_t pflags;
1.104 djm 671: Attrib a;
1.1 markus 672: char *name;
1.104 djm 673: int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
674:
675: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
676: (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
677: (r = decode_attrib(iqueue, &a)) != 0)
678: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 679:
1.61 djm 680: debug3("request %u: open flags %d", id, pflags);
1.1 markus 681: flags = flags_from_portable(pflags);
1.104 djm 682: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
1.58 djm 683: logit("open \"%s\" flags %s mode 0%o",
684: name, string_from_portable(pflags), mode);
1.90 djm 685: if (readonly &&
1.111 ! djm 686: ((flags & O_ACCMODE) != O_RDONLY ||
! 687: (flags & (O_CREAT|O_TRUNC)) != 0)) {
1.98 djm 688: verbose("Refusing open request in read-only mode");
1.104 djm 689: status = SSH2_FX_PERMISSION_DENIED;
1.98 djm 690: } else {
1.90 djm 691: fd = open(name, flags, mode);
692: if (fd < 0) {
693: status = errno_to_portable(errno);
1.1 markus 694: } else {
1.101 djm 695: handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
1.90 djm 696: if (handle < 0) {
697: close(fd);
698: } else {
699: send_handle(id, handle);
700: status = SSH2_FX_OK;
701: }
1.1 markus 702: }
703: }
1.10 markus 704: if (status != SSH2_FX_OK)
1.1 markus 705: send_status(id, status);
1.97 djm 706: free(name);
1.1 markus 707: }
708:
1.28 itojun 709: static void
1.98 djm 710: process_close(u_int32_t id)
1.1 markus 711: {
1.104 djm 712: int r, handle, ret, status = SSH2_FX_FAILURE;
713:
714: if ((r = get_handle(iqueue, &handle)) != 0)
715: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 716:
1.58 djm 717: debug3("request %u: close handle %u", id, handle);
718: handle_log_close(handle, NULL);
1.1 markus 719: ret = handle_close(handle);
1.10 markus 720: status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 721: send_status(id, status);
722: }
723:
1.28 itojun 724: static void
1.98 djm 725: process_read(u_int32_t id)
1.1 markus 726: {
1.104 djm 727: u_char buf[64*1024];
1.98 djm 728: u_int32_t len;
1.104 djm 729: int r, handle, fd, ret, status = SSH2_FX_FAILURE;
1.1 markus 730: u_int64_t off;
731:
1.104 djm 732: if ((r = get_handle(iqueue, &handle)) != 0 ||
733: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
734: (r = sshbuf_get_u32(iqueue, &len)) != 0)
735: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 736:
1.58 djm 737: debug("request %u: read \"%s\" (handle %d) off %llu len %d",
738: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 739: if (len > sizeof buf) {
740: len = sizeof buf;
1.58 djm 741: debug2("read change len %d", len);
1.1 markus 742: }
743: fd = handle_to_fd(handle);
744: if (fd >= 0) {
745: if (lseek(fd, off, SEEK_SET) < 0) {
746: error("process_read: seek failed");
747: status = errno_to_portable(errno);
748: } else {
749: ret = read(fd, buf, len);
750: if (ret < 0) {
751: status = errno_to_portable(errno);
752: } else if (ret == 0) {
1.10 markus 753: status = SSH2_FX_EOF;
1.1 markus 754: } else {
755: send_data(id, buf, ret);
1.10 markus 756: status = SSH2_FX_OK;
1.58 djm 757: handle_update_read(handle, ret);
1.1 markus 758: }
759: }
760: }
1.10 markus 761: if (status != SSH2_FX_OK)
1.1 markus 762: send_status(id, status);
763: }
764:
1.28 itojun 765: static void
1.98 djm 766: process_write(u_int32_t id)
1.1 markus 767: {
768: u_int64_t off;
1.104 djm 769: size_t len;
770: int r, handle, fd, ret, status;
771: u_char *data;
772:
773: if ((r = get_handle(iqueue, &handle)) != 0 ||
774: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
775: (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
776: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 777:
1.104 djm 778: debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
1.58 djm 779: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 780: fd = handle_to_fd(handle);
1.104 djm 781:
1.90 djm 782: if (fd < 0)
783: status = SSH2_FX_FAILURE;
784: else {
1.101 djm 785: if (!(handle_to_flags(handle) & O_APPEND) &&
786: lseek(fd, off, SEEK_SET) < 0) {
1.1 markus 787: status = errno_to_portable(errno);
788: error("process_write: seek failed");
789: } else {
790: /* XXX ATOMICIO ? */
791: ret = write(fd, data, len);
1.48 djm 792: if (ret < 0) {
1.1 markus 793: error("process_write: write failed");
794: status = errno_to_portable(errno);
1.48 djm 795: } else if ((size_t)ret == len) {
1.10 markus 796: status = SSH2_FX_OK;
1.58 djm 797: handle_update_write(handle, ret);
1.1 markus 798: } else {
1.58 djm 799: debug2("nothing at all written");
1.90 djm 800: status = SSH2_FX_FAILURE;
1.1 markus 801: }
802: }
803: }
804: send_status(id, status);
1.97 djm 805: free(data);
1.1 markus 806: }
807:
1.28 itojun 808: static void
1.98 djm 809: process_do_stat(u_int32_t id, int do_lstat)
1.1 markus 810: {
1.13 markus 811: Attrib a;
1.1 markus 812: struct stat st;
813: char *name;
1.104 djm 814: int r, status = SSH2_FX_FAILURE;
815:
816: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
817: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 818:
1.58 djm 819: debug3("request %u: %sstat", id, do_lstat ? "l" : "");
820: verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
1.104 djm 821: r = do_lstat ? lstat(name, &st) : stat(name, &st);
822: if (r < 0) {
1.1 markus 823: status = errno_to_portable(errno);
824: } else {
1.13 markus 825: stat_to_attrib(&st, &a);
826: send_attrib(id, &a);
1.10 markus 827: status = SSH2_FX_OK;
1.1 markus 828: }
1.10 markus 829: if (status != SSH2_FX_OK)
1.1 markus 830: send_status(id, status);
1.97 djm 831: free(name);
1.1 markus 832: }
833:
1.28 itojun 834: static void
1.98 djm 835: process_stat(u_int32_t id)
1.1 markus 836: {
1.98 djm 837: process_do_stat(id, 0);
1.1 markus 838: }
839:
1.28 itojun 840: static void
1.98 djm 841: process_lstat(u_int32_t id)
1.1 markus 842: {
1.98 djm 843: process_do_stat(id, 1);
1.1 markus 844: }
845:
1.28 itojun 846: static void
1.98 djm 847: process_fstat(u_int32_t id)
1.1 markus 848: {
1.13 markus 849: Attrib a;
1.1 markus 850: struct stat st;
1.104 djm 851: int fd, r, handle, status = SSH2_FX_FAILURE;
1.1 markus 852:
1.104 djm 853: if ((r = get_handle(iqueue, &handle)) != 0)
854: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.58 djm 855: debug("request %u: fstat \"%s\" (handle %u)",
856: id, handle_to_name(handle), handle);
1.1 markus 857: fd = handle_to_fd(handle);
1.71 stevesk 858: if (fd >= 0) {
1.104 djm 859: r = fstat(fd, &st);
860: if (r < 0) {
1.1 markus 861: status = errno_to_portable(errno);
862: } else {
1.13 markus 863: stat_to_attrib(&st, &a);
864: send_attrib(id, &a);
1.10 markus 865: status = SSH2_FX_OK;
1.1 markus 866: }
867: }
1.10 markus 868: if (status != SSH2_FX_OK)
1.1 markus 869: send_status(id, status);
870: }
871:
1.28 itojun 872: static struct timeval *
1.44 jakob 873: attrib_to_tv(const Attrib *a)
1.1 markus 874: {
875: static struct timeval tv[2];
1.22 deraadt 876:
1.1 markus 877: tv[0].tv_sec = a->atime;
878: tv[0].tv_usec = 0;
879: tv[1].tv_sec = a->mtime;
880: tv[1].tv_usec = 0;
881: return tv;
882: }
883:
1.28 itojun 884: static void
1.98 djm 885: process_setstat(u_int32_t id)
1.1 markus 886: {
1.104 djm 887: Attrib a;
1.1 markus 888: char *name;
1.104 djm 889: int r, status = SSH2_FX_OK;
890:
891: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
892: (r = decode_attrib(iqueue, &a)) != 0)
893: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 894:
1.58 djm 895: debug("request %u: setstat name \"%s\"", id, name);
1.104 djm 896: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 897: logit("set \"%s\" size %llu",
1.104 djm 898: name, (unsigned long long)a.size);
899: r = truncate(name, a.size);
900: if (r == -1)
1.33 markus 901: status = errno_to_portable(errno);
902: }
1.104 djm 903: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
904: logit("set \"%s\" mode %04o", name, a.perm);
905: r = chmod(name, a.perm & 07777);
906: if (r == -1)
1.1 markus 907: status = errno_to_portable(errno);
908: }
1.104 djm 909: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 910: char buf[64];
1.104 djm 911: time_t t = a.mtime;
1.58 djm 912:
913: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
914: localtime(&t));
915: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 916: r = utimes(name, attrib_to_tv(&a));
917: if (r == -1)
1.1 markus 918: status = errno_to_portable(errno);
919: }
1.104 djm 920: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 921: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 922: (u_long)a.uid, (u_long)a.gid);
923: r = chown(name, a.uid, a.gid);
924: if (r == -1)
1.18 stevesk 925: status = errno_to_portable(errno);
926: }
1.1 markus 927: send_status(id, status);
1.97 djm 928: free(name);
1.1 markus 929: }
930:
1.28 itojun 931: static void
1.98 djm 932: process_fsetstat(u_int32_t id)
1.1 markus 933: {
1.104 djm 934: Attrib a;
935: int handle, fd, r;
1.10 markus 936: int status = SSH2_FX_OK;
1.1 markus 937:
1.104 djm 938: if ((r = get_handle(iqueue, &handle)) != 0 ||
939: (r = decode_attrib(iqueue, &a)) != 0)
940: fatal("%s: buffer error: %s", __func__, ssh_err(r));
941:
1.58 djm 942: debug("request %u: fsetstat handle %d", id, handle);
1.1 markus 943: fd = handle_to_fd(handle);
1.90 djm 944: if (fd < 0)
1.10 markus 945: status = SSH2_FX_FAILURE;
1.90 djm 946: else {
1.58 djm 947: char *name = handle_to_name(handle);
948:
1.104 djm 949: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 950: logit("set \"%s\" size %llu",
1.104 djm 951: name, (unsigned long long)a.size);
952: r = ftruncate(fd, a.size);
953: if (r == -1)
1.33 markus 954: status = errno_to_portable(errno);
955: }
1.104 djm 956: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
957: logit("set \"%s\" mode %04o", name, a.perm);
958: r = fchmod(fd, a.perm & 07777);
959: if (r == -1)
1.1 markus 960: status = errno_to_portable(errno);
961: }
1.104 djm 962: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 963: char buf[64];
1.104 djm 964: time_t t = a.mtime;
1.58 djm 965:
966: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
967: localtime(&t));
968: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 969: r = futimes(fd, attrib_to_tv(&a));
970: if (r == -1)
1.18 stevesk 971: status = errno_to_portable(errno);
972: }
1.104 djm 973: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 974: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 975: (u_long)a.uid, (u_long)a.gid);
976: r = fchown(fd, a.uid, a.gid);
977: if (r == -1)
1.1 markus 978: status = errno_to_portable(errno);
979: }
980: }
981: send_status(id, status);
982: }
983:
1.28 itojun 984: static void
1.98 djm 985: process_opendir(u_int32_t id)
1.1 markus 986: {
987: DIR *dirp = NULL;
988: char *path;
1.104 djm 989: int r, handle, status = SSH2_FX_FAILURE;
990:
991: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
992: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 993:
1.58 djm 994: debug3("request %u: opendir", id);
995: logit("opendir \"%s\"", path);
1.17 stevesk 996: dirp = opendir(path);
1.1 markus 997: if (dirp == NULL) {
998: status = errno_to_portable(errno);
999: } else {
1.101 djm 1000: handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1.1 markus 1001: if (handle < 0) {
1002: closedir(dirp);
1003: } else {
1004: send_handle(id, handle);
1.10 markus 1005: status = SSH2_FX_OK;
1.1 markus 1006: }
1.17 stevesk 1007:
1.1 markus 1008: }
1.10 markus 1009: if (status != SSH2_FX_OK)
1.1 markus 1010: send_status(id, status);
1.97 djm 1011: free(path);
1.1 markus 1012: }
1013:
1.28 itojun 1014: static void
1.98 djm 1015: process_readdir(u_int32_t id)
1.1 markus 1016: {
1017: DIR *dirp;
1018: struct dirent *dp;
1019: char *path;
1.104 djm 1020: int r, handle;
1021:
1022: if ((r = get_handle(iqueue, &handle)) != 0)
1023: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1024:
1.58 djm 1025: debug("request %u: readdir \"%s\" (handle %d)", id,
1026: handle_to_name(handle), handle);
1.1 markus 1027: dirp = handle_to_dir(handle);
1028: path = handle_to_name(handle);
1029: if (dirp == NULL || path == NULL) {
1.10 markus 1030: send_status(id, SSH2_FX_FAILURE);
1.1 markus 1031: } else {
1032: struct stat st;
1.105 deraadt 1033: char pathname[PATH_MAX];
1.1 markus 1034: Stat *stats;
1035: int nstats = 10, count = 0, i;
1.36 deraadt 1036:
1.54 djm 1037: stats = xcalloc(nstats, sizeof(Stat));
1.1 markus 1038: while ((dp = readdir(dirp)) != NULL) {
1039: if (count >= nstats) {
1040: nstats *= 2;
1.106 deraadt 1041: stats = xreallocarray(stats, nstats, sizeof(Stat));
1.1 markus 1042: }
1043: /* XXX OVERFLOW ? */
1.30 jakob 1044: snprintf(pathname, sizeof pathname, "%s%s%s", path,
1045: strcmp(path, "/") ? "/" : "", dp->d_name);
1.1 markus 1046: if (lstat(pathname, &st) < 0)
1047: continue;
1.13 markus 1048: stat_to_attrib(&st, &(stats[count].attrib));
1.1 markus 1049: stats[count].name = xstrdup(dp->d_name);
1.91 djm 1050: stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1.1 markus 1051: count++;
1052: /* send up to 100 entries in one message */
1.11 markus 1053: /* XXX check packet size instead */
1.1 markus 1054: if (count == 100)
1055: break;
1056: }
1.10 markus 1057: if (count > 0) {
1058: send_names(id, count, stats);
1.31 deraadt 1059: for (i = 0; i < count; i++) {
1.97 djm 1060: free(stats[i].name);
1061: free(stats[i].long_name);
1.10 markus 1062: }
1063: } else {
1064: send_status(id, SSH2_FX_EOF);
1.1 markus 1065: }
1.97 djm 1066: free(stats);
1.1 markus 1067: }
1068: }
1069:
1.28 itojun 1070: static void
1.98 djm 1071: process_remove(u_int32_t id)
1.1 markus 1072: {
1073: char *name;
1.104 djm 1074: int r, status = SSH2_FX_FAILURE;
1075:
1076: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1077: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1078:
1.58 djm 1079: debug3("request %u: remove", id);
1080: logit("remove name \"%s\"", name);
1.104 djm 1081: r = unlink(name);
1082: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1083: send_status(id, status);
1.97 djm 1084: free(name);
1.1 markus 1085: }
1086:
1.28 itojun 1087: static void
1.98 djm 1088: process_mkdir(u_int32_t id)
1.1 markus 1089: {
1.104 djm 1090: Attrib a;
1.1 markus 1091: char *name;
1.104 djm 1092: int r, mode, status = SSH2_FX_FAILURE;
1093:
1094: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1095: (r = decode_attrib(iqueue, &a)) != 0)
1096: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1097:
1.104 djm 1098: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1099: a.perm & 07777 : 0777;
1.58 djm 1100: debug3("request %u: mkdir", id);
1101: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1102: r = mkdir(name, mode);
1103: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1104: send_status(id, status);
1.97 djm 1105: free(name);
1.1 markus 1106: }
1107:
1.28 itojun 1108: static void
1.98 djm 1109: process_rmdir(u_int32_t id)
1.1 markus 1110: {
1111: char *name;
1.104 djm 1112: int r, status;
1113:
1114: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1115: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1116:
1.58 djm 1117: debug3("request %u: rmdir", id);
1118: logit("rmdir name \"%s\"", name);
1.104 djm 1119: r = rmdir(name);
1120: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1121: send_status(id, status);
1.97 djm 1122: free(name);
1.1 markus 1123: }
1124:
1.28 itojun 1125: static void
1.98 djm 1126: process_realpath(u_int32_t id)
1.1 markus 1127: {
1.105 deraadt 1128: char resolvedname[PATH_MAX];
1.1 markus 1129: char *path;
1.104 djm 1130: int r;
1131:
1132: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1133: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1134:
1.7 markus 1135: if (path[0] == '\0') {
1.97 djm 1136: free(path);
1.7 markus 1137: path = xstrdup(".");
1138: }
1.58 djm 1139: debug3("request %u: realpath", id);
1140: verbose("realpath \"%s\"", path);
1.1 markus 1141: if (realpath(path, resolvedname) == NULL) {
1142: send_status(id, errno_to_portable(errno));
1143: } else {
1144: Stat s;
1145: attrib_clear(&s.attrib);
1146: s.name = s.long_name = resolvedname;
1147: send_names(id, 1, &s);
1148: }
1.97 djm 1149: free(path);
1.1 markus 1150: }
1151:
1.28 itojun 1152: static void
1.98 djm 1153: process_rename(u_int32_t id)
1.1 markus 1154: {
1155: char *oldpath, *newpath;
1.104 djm 1156: int r, status;
1.41 deraadt 1157: struct stat sb;
1.1 markus 1158:
1.104 djm 1159: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1160: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1161: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1162:
1.58 djm 1163: debug3("request %u: rename", id);
1164: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1165: status = SSH2_FX_FAILURE;
1.98 djm 1166: if (lstat(oldpath, &sb) == -1)
1.39 markus 1167: status = errno_to_portable(errno);
1.41 deraadt 1168: else if (S_ISREG(sb.st_mode)) {
1169: /* Race-free rename of regular files */
1.47 dtucker 1170: if (link(oldpath, newpath) == -1) {
1171: if (errno == EOPNOTSUPP) {
1172: struct stat st;
1173:
1174: /*
1175: * fs doesn't support links, so fall back to
1176: * stat+rename. This is racy.
1177: */
1178: if (stat(newpath, &st) == -1) {
1179: if (rename(oldpath, newpath) == -1)
1180: status =
1181: errno_to_portable(errno);
1182: else
1183: status = SSH2_FX_OK;
1184: }
1185: } else {
1186: status = errno_to_portable(errno);
1187: }
1188: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1189: status = errno_to_portable(errno);
1190: /* clean spare link */
1191: unlink(newpath);
1192: } else
1193: status = SSH2_FX_OK;
1194: } else if (stat(newpath, &sb) == -1) {
1195: if (rename(oldpath, newpath) == -1)
1196: status = errno_to_portable(errno);
1197: else
1198: status = SSH2_FX_OK;
1199: }
1.1 markus 1200: send_status(id, status);
1.97 djm 1201: free(oldpath);
1202: free(newpath);
1.1 markus 1203: }
1204:
1.28 itojun 1205: static void
1.98 djm 1206: process_readlink(u_int32_t id)
1.23 djm 1207: {
1.104 djm 1208: int r, len;
1.105 deraadt 1209: char buf[PATH_MAX];
1.23 djm 1210: char *path;
1211:
1.104 djm 1212: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1213: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1214:
1.58 djm 1215: debug3("request %u: readlink", id);
1216: verbose("readlink \"%s\"", path);
1.46 avsm 1217: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1218: send_status(id, errno_to_portable(errno));
1219: else {
1220: Stat s;
1.31 deraadt 1221:
1.46 avsm 1222: buf[len] = '\0';
1.23 djm 1223: attrib_clear(&s.attrib);
1.46 avsm 1224: s.name = s.long_name = buf;
1.23 djm 1225: send_names(id, 1, &s);
1226: }
1.97 djm 1227: free(path);
1.23 djm 1228: }
1229:
1.28 itojun 1230: static void
1.98 djm 1231: process_symlink(u_int32_t id)
1.23 djm 1232: {
1233: char *oldpath, *newpath;
1.104 djm 1234: int r, status;
1235:
1236: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1237: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1238: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.23 djm 1239:
1.58 djm 1240: debug3("request %u: symlink", id);
1241: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1242: /* this will fail if 'newpath' exists */
1.104 djm 1243: r = symlink(oldpath, newpath);
1244: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1245: send_status(id, status);
1.97 djm 1246: free(oldpath);
1247: free(newpath);
1.23 djm 1248: }
1249:
1.28 itojun 1250: static void
1.78 djm 1251: process_extended_posix_rename(u_int32_t id)
1252: {
1253: char *oldpath, *newpath;
1.104 djm 1254: int r, status;
1255:
1256: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1257: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1258: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.78 djm 1259:
1260: debug3("request %u: posix-rename", id);
1261: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1262: r = rename(oldpath, newpath);
1263: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1264: send_status(id, status);
1.97 djm 1265: free(oldpath);
1266: free(newpath);
1.78 djm 1267: }
1268:
1269: static void
1.79 djm 1270: process_extended_statvfs(u_int32_t id)
1271: {
1272: char *path;
1273: struct statvfs st;
1.104 djm 1274: int r;
1.79 djm 1275:
1.104 djm 1276: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1277: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.103 dtucker 1278: debug3("request %u: statvfs", id);
1279: logit("statvfs \"%s\"", path);
1.79 djm 1280:
1281: if (statvfs(path, &st) != 0)
1282: send_status(id, errno_to_portable(errno));
1283: else
1284: send_statvfs(id, &st);
1.97 djm 1285: free(path);
1.79 djm 1286: }
1287:
1288: static void
1289: process_extended_fstatvfs(u_int32_t id)
1290: {
1.104 djm 1291: int r, handle, fd;
1.79 djm 1292: struct statvfs st;
1293:
1.104 djm 1294: if ((r = get_handle(iqueue, &handle)) != 0)
1295: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.79 djm 1296: debug("request %u: fstatvfs \"%s\" (handle %u)",
1297: id, handle_to_name(handle), handle);
1298: if ((fd = handle_to_fd(handle)) < 0) {
1299: send_status(id, SSH2_FX_FAILURE);
1300: return;
1301: }
1302: if (fstatvfs(fd, &st) != 0)
1303: send_status(id, errno_to_portable(errno));
1304: else
1305: send_statvfs(id, &st);
1306: }
1307:
1308: static void
1.93 djm 1309: process_extended_hardlink(u_int32_t id)
1310: {
1311: char *oldpath, *newpath;
1.104 djm 1312: int r, status;
1313:
1314: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1315: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1316: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.93 djm 1317:
1318: debug3("request %u: hardlink", id);
1319: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1320: r = link(oldpath, newpath);
1321: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1322: send_status(id, status);
1.97 djm 1323: free(oldpath);
1324: free(newpath);
1.102 djm 1325: }
1326:
1327: static void
1328: process_extended_fsync(u_int32_t id)
1329: {
1.104 djm 1330: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1331:
1.104 djm 1332: if ((r = get_handle(iqueue, &handle)) != 0)
1333: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.102 djm 1334: debug3("request %u: fsync (handle %u)", id, handle);
1335: verbose("fsync \"%s\"", handle_to_name(handle));
1336: if ((fd = handle_to_fd(handle)) < 0)
1337: status = SSH2_FX_NO_SUCH_FILE;
1338: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1339: r = fsync(fd);
1340: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1341: }
1342: send_status(id, status);
1.93 djm 1343: }
1344:
1345: static void
1.98 djm 1346: process_extended(u_int32_t id)
1.10 markus 1347: {
1348: char *request;
1.104 djm 1349: int i, r;
1.10 markus 1350:
1.104 djm 1351: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1352: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.98 djm 1353: for (i = 0; extended_handlers[i].handler != NULL; i++) {
1354: if (strcmp(request, extended_handlers[i].ext_name) == 0) {
1355: if (!request_permitted(&extended_handlers[i]))
1356: send_status(id, SSH2_FX_PERMISSION_DENIED);
1357: else
1358: extended_handlers[i].handler(id);
1359: break;
1360: }
1361: }
1362: if (extended_handlers[i].handler == NULL) {
1363: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1364: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.98 djm 1365: }
1.97 djm 1366: free(request);
1.10 markus 1367: }
1.1 markus 1368:
1369: /* stolen from ssh-agent */
1370:
1.28 itojun 1371: static void
1.1 markus 1372: process(void)
1373: {
1.104 djm 1374: u_int msg_len;
1375: u_int buf_len;
1376: u_int consumed;
1377: u_char type;
1378: const u_char *cp;
1379: int i, r;
1.98 djm 1380: u_int32_t id;
1.1 markus 1381:
1.104 djm 1382: buf_len = sshbuf_len(iqueue);
1.34 markus 1383: if (buf_len < 5)
1.1 markus 1384: return; /* Incomplete message. */
1.104 djm 1385: cp = sshbuf_ptr(iqueue);
1.57 djm 1386: msg_len = get_u32(cp);
1.50 djm 1387: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1388: error("bad message from %s local user %s",
1389: client_addr, pw->pw_name);
1.76 markus 1390: sftp_server_cleanup_exit(11);
1.1 markus 1391: }
1.34 markus 1392: if (buf_len < msg_len + 4)
1.1 markus 1393: return;
1.104 djm 1394: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1395: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.34 markus 1396: buf_len -= 4;
1.104 djm 1397: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1398: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.98 djm 1399:
1.1 markus 1400: switch (type) {
1.10 markus 1401: case SSH2_FXP_INIT:
1.1 markus 1402: process_init();
1.98 djm 1403: init_done = 1;
1.1 markus 1404: break;
1.10 markus 1405: case SSH2_FXP_EXTENDED:
1.98 djm 1406: if (!init_done)
1407: fatal("Received extended request before init");
1.104 djm 1408: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1409: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.98 djm 1410: process_extended(id);
1.10 markus 1411: break;
1.1 markus 1412: default:
1.98 djm 1413: if (!init_done)
1414: fatal("Received %u request before init", type);
1.104 djm 1415: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1416: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.98 djm 1417: for (i = 0; handlers[i].handler != NULL; i++) {
1418: if (type == handlers[i].type) {
1419: if (!request_permitted(&handlers[i])) {
1420: send_status(id,
1421: SSH2_FX_PERMISSION_DENIED);
1422: } else {
1423: handlers[i].handler(id);
1424: }
1425: break;
1426: }
1427: }
1428: if (handlers[i].handler == NULL)
1429: error("Unknown message %u", type);
1.1 markus 1430: }
1.34 markus 1431: /* discard the remaining bytes from the current packet */
1.104 djm 1432: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1433: error("iqueue grew unexpectedly");
1434: sftp_server_cleanup_exit(255);
1435: }
1.104 djm 1436: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1437: if (msg_len < consumed) {
1.98 djm 1438: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1439: sftp_server_cleanup_exit(255);
1440: }
1.104 djm 1441: if (msg_len > consumed &&
1442: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1443: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1444: }
1445:
1.58 djm 1446: /* Cleanup handler that logs active handles upon normal exit */
1447: void
1.76 markus 1448: sftp_server_cleanup_exit(int i)
1.58 djm 1449: {
1450: if (pw != NULL && client_addr != NULL) {
1451: handle_log_exit();
1452: logit("session closed for local user %s from [%s]",
1453: pw->pw_name, client_addr);
1454: }
1455: _exit(i);
1456: }
1457:
1458: static void
1.76 markus 1459: sftp_server_usage(void)
1.58 djm 1460: {
1461: extern char *__progname;
1462:
1463: fprintf(stderr,
1.96 jmc 1464: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.100 jmc 1465: "[-l log_level]\n\t[-P blacklisted_requests] "
1466: "[-p whitelisted_requests] [-u umask]\n"
1467: " %s -Q protocol_feature\n",
1468: __progname, __progname);
1.58 djm 1469: exit(1);
1470: }
1471:
1.1 markus 1472: int
1.77 djm 1473: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1474: {
1.21 millert 1475: fd_set *rset, *wset;
1.104 djm 1476: int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
1.21 millert 1477: ssize_t len, olen, set_size;
1.58 djm 1478: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.95 djm 1479: char *cp, *homedir = NULL, buf[4*4096];
1.92 djm 1480: long mask;
1.58 djm 1481:
1482: extern char *optarg;
1483: extern char *__progname;
1.49 djm 1484:
1.109 dtucker 1485: ssh_malloc_init(); /* must be called before any mallocs */
1.58 djm 1486: log_init(__progname, log_level, log_facility, log_stderr);
1487:
1.95 djm 1488: pw = pwcopy(user_pw);
1489:
1.98 djm 1490: while (!skipargs && (ch = getopt(argc, argv,
1491: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1492: switch (ch) {
1.98 djm 1493: case 'Q':
1494: if (strcasecmp(optarg, "requests") != 0) {
1495: fprintf(stderr, "Invalid query type\n");
1496: exit(1);
1497: }
1498: for (i = 0; handlers[i].handler != NULL; i++)
1499: printf("%s\n", handlers[i].name);
1500: for (i = 0; extended_handlers[i].handler != NULL; i++)
1501: printf("%s\n", extended_handlers[i].name);
1502: exit(0);
1503: break;
1.90 djm 1504: case 'R':
1505: readonly = 1;
1506: break;
1.58 djm 1507: case 'c':
1508: /*
1509: * Ignore all arguments if we are invoked as a
1.70 deraadt 1510: * shell using "sftp-server -c command"
1.58 djm 1511: */
1512: skipargs = 1;
1513: break;
1514: case 'e':
1515: log_stderr = 1;
1516: break;
1517: case 'l':
1518: log_level = log_level_number(optarg);
1519: if (log_level == SYSLOG_LEVEL_NOT_SET)
1520: error("Invalid log level \"%s\"", optarg);
1521: break;
1522: case 'f':
1523: log_facility = log_facility_number(optarg);
1.74 djm 1524: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1525: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1526: break;
1.95 djm 1527: case 'd':
1528: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1529: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1530: "u", user_pw->pw_name, (char *)NULL);
1531: free(cp);
1.98 djm 1532: break;
1533: case 'p':
1534: if (request_whitelist != NULL)
1535: fatal("Permitted requests already set");
1536: request_whitelist = xstrdup(optarg);
1537: break;
1538: case 'P':
1539: if (request_blacklist != NULL)
1540: fatal("Refused requests already set");
1541: request_blacklist = xstrdup(optarg);
1.95 djm 1542: break;
1.86 djm 1543: case 'u':
1.92 djm 1544: errno = 0;
1545: mask = strtol(optarg, &cp, 8);
1546: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1547: cp == optarg || (mask == 0 && errno != 0))
1548: fatal("Invalid umask \"%s\"", optarg);
1549: (void)umask((mode_t)mask);
1.58 djm 1550: break;
1551: case 'h':
1552: default:
1.76 markus 1553: sftp_server_usage();
1.58 djm 1554: }
1555: }
1556:
1557: log_init(__progname, log_level, log_facility, log_stderr);
1558:
1559: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1560: client_addr = xstrdup(cp);
1.76 markus 1561: if ((cp = strchr(client_addr, ' ')) == NULL) {
1562: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1563: getenv("SSH_CONNECTION"));
1.76 markus 1564: sftp_server_cleanup_exit(255);
1565: }
1.58 djm 1566: *cp = '\0';
1567: } else
1568: client_addr = xstrdup("UNKNOWN");
1569:
1570: logit("session opened for local user %s from [%s]",
1571: pw->pw_name, client_addr);
1.10 markus 1572:
1.89 djm 1573: in = STDIN_FILENO;
1574: out = STDOUT_FILENO;
1.1 markus 1575:
1576: max = 0;
1577: if (in > max)
1578: max = in;
1579: if (out > max)
1580: max = out;
1581:
1.104 djm 1582: if ((iqueue = sshbuf_new()) == NULL)
1583: fatal("%s: sshbuf_new failed", __func__);
1584: if ((oqueue = sshbuf_new()) == NULL)
1585: fatal("%s: sshbuf_new failed", __func__);
1.1 markus 1586:
1.108 logan 1587: rset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1588: wset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1.95 djm 1589:
1590: if (homedir != NULL) {
1591: if (chdir(homedir) != 0) {
1592: error("chdir to \"%s\" failed: %s", homedir,
1593: strerror(errno));
1594: }
1595: }
1.21 millert 1596:
1.108 logan 1597: set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1.1 markus 1598: for (;;) {
1.21 millert 1599: memset(rset, 0, set_size);
1600: memset(wset, 0, set_size);
1.1 markus 1601:
1.73 djm 1602: /*
1603: * Ensure that we can read a full buffer and handle
1604: * the worst-case length packet it can generate,
1605: * otherwise apply backpressure by stopping reads.
1606: */
1.104 djm 1607: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1608: (r = sshbuf_check_reserve(oqueue,
1609: SFTP_MAX_MSG_LENGTH)) == 0)
1.73 djm 1610: FD_SET(in, rset);
1.104 djm 1611: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1612: fatal("%s: sshbuf_check_reserve failed: %s",
1613: __func__, ssh_err(r));
1.73 djm 1614:
1.104 djm 1615: olen = sshbuf_len(oqueue);
1.1 markus 1616: if (olen > 0)
1.21 millert 1617: FD_SET(out, wset);
1.1 markus 1618:
1.21 millert 1619: if (select(max+1, rset, wset, NULL, NULL) < 0) {
1.1 markus 1620: if (errno == EINTR)
1621: continue;
1.58 djm 1622: error("select: %s", strerror(errno));
1.76 markus 1623: sftp_server_cleanup_exit(2);
1.1 markus 1624: }
1625:
1626: /* copy stdin to iqueue */
1.21 millert 1627: if (FD_ISSET(in, rset)) {
1.1 markus 1628: len = read(in, buf, sizeof buf);
1629: if (len == 0) {
1630: debug("read eof");
1.76 markus 1631: sftp_server_cleanup_exit(0);
1.1 markus 1632: } else if (len < 0) {
1.58 djm 1633: error("read: %s", strerror(errno));
1.76 markus 1634: sftp_server_cleanup_exit(1);
1.104 djm 1635: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0) {
1636: fatal("%s: buffer error: %s",
1637: __func__, ssh_err(r));
1.1 markus 1638: }
1639: }
1640: /* send oqueue to stdout */
1.21 millert 1641: if (FD_ISSET(out, wset)) {
1.104 djm 1642: len = write(out, sshbuf_ptr(oqueue), olen);
1.1 markus 1643: if (len < 0) {
1.58 djm 1644: error("write: %s", strerror(errno));
1.76 markus 1645: sftp_server_cleanup_exit(1);
1.104 djm 1646: } else if ((r = sshbuf_consume(oqueue, len)) != 0) {
1647: fatal("%s: buffer error: %s",
1648: __func__, ssh_err(r));
1.1 markus 1649: }
1650: }
1.73 djm 1651:
1652: /*
1653: * Process requests from client if we can fit the results
1654: * into the output buffer, otherwise stop processing input
1655: * and let the output queue drain.
1656: */
1.104 djm 1657: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
1658: if (r == 0)
1.73 djm 1659: process();
1.104 djm 1660: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1661: fatal("%s: sshbuf_check_reserve: %s",
1662: __func__, ssh_err(r));
1.1 markus 1663: }
1664: }
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