1 /* ftpd.c: BetaFTPD main
2 Copyright (C) 1999-2000 Steinar H. Gunderson
4 This program is is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License, version 2 if the
6 License as published by the Free Software Foundation.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 * Special note: this file has been overwritten by another (0-byte) file, been
20 * through the dead, and restored (with the help of dd, grep, gpm, vi and less)
21 * with a sucess rate of 99.9%. Show it a little respect -- don't add junk
32 #include <sys/types.h>
80 #include <netinet/in.h>
84 #include <arpa/inet.h>
92 #include <sys/socket.h>
96 #include <sys/ioctl.h>
99 #if HAVE_NETINET_IN_SYSTM_H
100 #include <netinet/in_systm.h>
103 #if HAVE_NETINET_IP_H
104 #include <netinet/ip.h>
107 #if HAVE_NETINET_TCP_H
108 #include <netinet/tcp.h>
111 #if HAVE_LINUX_SOCKET_H
112 #include <linux/socket.h>
116 #include <sys/mman.h>
124 #include <sys/time.h>
128 #include <sys/time.h>
132 #include <sys/filio.h>
147 #if HAVE_SYS_SIGNAL_H
148 #include <sys/signal.h>
152 #include <sys/poll.h>
155 #if HAVE_SYS_SENDFILE_H
156 #include <sys/sendfile.h>
160 * <linux/socket.h> does not export this to glibc2 systems, and it isn't
161 * always defined anywhere else.
163 #if !defined(TCP_CORK) && defined(__linux__)
175 #define MAP_FAILED -1
178 struct conn *first_conn = NULL;
179 struct ftran *first_ftran = NULL;
181 struct dcache *first_dcache = NULL;
185 unsigned int highest_fds = 0;
189 struct pollfd fds[FD_MAX];
191 #define MAXCLIENTS FD_MAX
193 fd_set master_fds, master_send_fds;
194 #define MAXCLIENTS FD_SETSIZE
198 FILE *xferlog = NULL;
202 * This variable specifies if it's soon time to check for timed out
203 * clients, and timed out directory listing cache entries. It is
204 * set to 1 by a signal handler every minute, and set to 0 when the
205 * checking has been performed.
207 int time_to_check = 1;
211 * snprintf(): snprintf() replacement for systems that miss it. Note
212 * that this implementation does _not_ necessarily protect
213 * against all buffer overflows. Get a real snprintf() in
214 * your C library. That being said, the 8k limit is
215 * substantially larger than any other string in BetaFTPD,
216 * which should make such an attack harder.
218 int snprintf(char *str, size_t n, const char *format, ...)
224 va_start(args, format);
225 err = vsprintf(buf, format, args);
235 #ifndef HAVE_VSNPRINTF
237 * vsnprintf: vsnprintf() replacement for systems that miss it. Please
238 * see snprintf (above) for more information.
240 int vsnprintf(char *str, size_t n, const char *format, va_list ap)
245 err = vsprintf(buf, format, ap);
253 * add_fd(): Add an fd to the set we monitor. Return 0 on success.
254 * This code is shared between poll() and select() versions.
256 int add_fd(const int fd, const int events)
260 printf("add_fd(%d, %x): failed\n", fd, events);
265 fds[fd].events = events;
266 if (highest_fds < fd)
269 if (fd >= FD_SETSIZE)
272 FD_SET(fd, &master_fds);
273 if (events & POLLOUT)
274 FD_SET(fd, &master_send_fds);
280 * del_fd(): Close and remove an fd from the set(s) we monitor. (See also add_fd().)
282 void del_fd(const int fd)
291 /* Reduce poll()'s workload by not making it watch past end of array */
292 while ((highest_fds > 0) && (fds[highest_fds].fd == -1))
295 if (fd >= FD_SETSIZE)
297 FD_CLR(fd, &master_fds);
298 FD_CLR(fd, &master_send_fds);
307 struct conn *c = first_conn;
308 printf("list_clients:\n");
309 while (c && c->next_conn) {
311 printf("list_clients: fd %d\n", c->sock);
317 * add_to_linked_list():
318 * Inserts an element (conn, ftran or dcache) into its linked list.
319 * The list is placed at the beginning, right after the (bogus)
320 * first element of the list.
322 void add_to_linked_list(struct list_element * const first,
323 struct list_element * const elem)
328 elem->next = first->next;
329 if (elem->next) elem->next->prev = elem;
332 /* this is the bogus head of the list */
338 * remove_from_linked_list():
339 * Removes an element (conn, ftran or dcache) from its linked list,
342 void remove_from_linked_list(struct list_element * const elem)
344 if (elem->prev != NULL) elem->prev->next = elem->next;
345 if (elem->next != NULL) elem->next->prev = elem->prev;
351 * Allocates a new control connection (type `struct conn'),
352 * initializes it, and adds it to the linked list. The connection
353 * operates on the socket SOCK.
355 struct conn *alloc_new_conn(const int sock)
357 const unsigned int one = 1;
358 struct conn *c = (struct conn *)(malloc(sizeof(struct conn)));
360 if (c == NULL) return c;
363 ioctl(sock, FIONBIO, &one);
364 if (add_fd(sock, POLLIN) != 0) {
366 send(sock, "230 Server too busy, please try again later.\r\n", 46, 0);
371 add_to_linked_list((struct list_element *)first_conn,
372 (struct list_element *)c);
374 /* this is the bogus head of the list */
381 c->buf_len = c->auth = c->rest_pos = 0;
388 * strcpy(c->curr_dir, "/");
389 * strcpy(c->last_cmd, "");
390 * strcpy(c->rename_from, "")
392 c->curr_dir[0] = '/';
394 c->curr_dir[1] = c->last_cmd[0] = c->rename_from[0] = '\0';
396 c->curr_dir[1] = c->rename_from[0] = '\0';
399 time(&(c->last_transfer));
408 * Allocates a new data connection (type `struct ftran'), and
409 * adds it to the linked list. The connection operates on the
410 * socket SOCK, and has the control connection C as its parent.
412 struct ftran *alloc_new_ftran(const int sock, const struct conn * const c)
414 struct ftran *f = (struct ftran *)(malloc(sizeof(struct ftran)));
416 if (f == NULL) return f;
418 /* this is the bogus head of the list */
419 f->next_ftran = NULL;
420 f->prev_ftran = NULL;
422 add_to_linked_list((struct list_element *)first_ftran,
423 (struct list_element *)f);
429 f->owner = (struct conn * const)c;
444 * alloc_new_dcache():
445 * Allocates a new directory cache entry (type `struct dcache'),
446 * and adds it to the linked list.
448 struct dcache *alloc_new_dcache()
450 struct dcache *d = (struct dcache *)(malloc(sizeof(struct dcache)));
452 if (d == NULL) return d;
456 strcpy(d->dir_name, "");
459 add_to_linked_list((struct list_element *)first_dcache,
460 (struct list_element *)d);
468 * Destroy a control connection, remove it from the linked
469 * list, and clean up after it.
471 void destroy_conn(struct conn * const c)
473 if (c == NULL) return;
476 destroy_ftran(c->transfer);
477 remove_from_linked_list((struct list_element *)c);
482 * Destroy a data connection, remove it from the linked list,
483 * and clean up after it.
485 * For some reason, TCP_CORK (Linux 2.2.x-only) doesn't flush
486 * even _after_ the socket is closed, so we zero it just before
487 * closing. We also zero just before sending the last packet,
488 * as it seems to be needed on some systems.
490 * If you wonder why I check for `defined(SOL_TCP)' and don't
491 * provide an alternative, see the comments on init_file_transfer().
493 void destroy_ftran(struct ftran * const f)
495 const unsigned int zero = 0;
497 if (f == NULL) return;
498 #if defined(TCP_CORK) && defined(SOL_TCP)
499 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
505 time(&(f->dir_cache->last_used));
506 f->dir_cache->use_count--;
512 if (f->dir_listing) {
516 munmap(f->file_data, f->size);
522 if (f->local_file != -1) close(f->local_file);
525 if (f->dir_listing) unlink(f->filename);
528 f->owner->transfer = NULL;
531 if (f->dir_cache != NULL) f->dir_cache->use_count--;
534 remove_from_linked_list((struct list_element *)f);
540 * Destroy a directory listing cache entry, remove it from the
541 * linked list, and clean up after it.
543 * If you free a cache entry that is in use (use_count > 0),
544 * BetaFTPD will most likely crash (later). The thing you're supposed
545 * to do when you're done with a dcache entry, is to decrement
546 * its use_count, and let the timeout functions do the destroying
547 * when it's time to do so.
549 void destroy_dcache(struct dcache * const d)
551 if (d == NULL) return;
553 if (d->dir_data != NULL) free(d->dir_data);
554 remove_from_linked_list((struct list_element *)d);
559 * process_all_clients():
560 * Processes all the control connections in active_clients
561 * (normally returned from a select(), there are at max
562 * NUM_AC active connections in the set), sending them
563 * through to the command parser if a command has been
567 int process_all_clients(const int num_ac)
569 int process_all_clients(const fd_set * const active_clients, const int num_ac)
572 struct conn *c = NULL, *next = first_conn->next_conn;
573 int checked_through = 0;
575 /* run through the linked list */
576 while (next != NULL && checked_through < num_ac) {
582 if (fds[c->sock].revents & (POLLERR|POLLHUP|POLLNVAL)) {
586 if (!fds[c->sock].revents & POLLIN) {
590 if (!FD_ISSET(c->sock, active_clients)) {
597 bytes_avail = recv(c->sock, c->recv_buf + c->buf_len,
598 255 - c->buf_len, 0);
599 if (bytes_avail <= 0) {
601 * select() has already told us there's something about
602 * this socket, so if we get a return value of zero, the
603 * client has closed the socket. If we get a return value
604 * of -1 (error), we close the socket ourselves.
606 * Just to be safe, we include this code for poll() as
613 /* overrun = disconnect */
614 if (c->buf_len + bytes_avail > 254) {
615 numeric(c, 503, "Buffer overrun; disconnecting.");
620 c->buf_len += bytes_avail;
623 return checked_through;
627 * process_all_sendfiles():
628 * Sends data to all clients that are ready to receive it.
629 * Also checks for data connections that are newly-connected,
630 * and handler xferlog entries for the files that are finished.
633 int process_all_sendfiles(const int num_ac)
635 int process_all_sendfiles(fd_set * const active_clients, const int num_ac)
638 struct ftran *f = NULL, *next = first_ftran->next_ftran;
639 int checked_through = 0;
640 struct sockaddr tempaddr;
641 int tempaddr_len = sizeof(tempaddr);
643 while (next != NULL && checked_through < num_ac) {
645 next = f->next_ftran;
648 if (fds[f->sock].revents & (POLLHUP|POLLERR|POLLNVAL)) {
654 /* state = 2: incoming PASV, state >3: send file */
656 if ((f->state < 2) || (f->state == 3) || (fds[f->sock].revents & (POLLIN|POLLOUT)) == 0) {
658 if ((f->state < 2) || (f->state == 3) || !FD_ISSET(f->sock, active_clients)) {
666 /* Nothing is needed for the poll() version? */
668 FD_CLR(f->sock, active_clients);
671 if (f->state == 2) { /* incoming PASV */
672 const unsigned int one = 1;
673 const int tempsock = accept(f->sock, (struct sockaddr *)&tempaddr,
678 if (tempsock == -1) {
684 ioctl(f->sock, FIONBIO, &one);
685 init_file_transfer(f);
687 if (f->upload) continue;
691 init_file_transfer(f);
693 if (f->upload) continue;
697 /* for download, we send the first packets right away */
700 if (do_upload(f)) continue;
703 if (do_download(f)) continue;
705 /* do_{upload,download} returned 0, the transfer is complete */
706 numeric(f->owner, 226, "Transfer complete.");
707 time(&(f->owner->last_transfer));
710 if (!f->dir_listing) {
717 update_display(first_conn);
721 return checked_through;
725 int do_upload(struct ftran *f)
727 char upload_buf[16384];
730 /* keep buffer size small in ascii transfers
731 to prevent process stalling while filtering
732 data on slower computers */
735 * This isn't a big problem, since we won't get
736 * packets this big anyway, the biggest I've seen
737 * was 12kB on 100mbit (but that was from a Windows
738 * machine), so I've reduced the buffer from 64 kB
739 * to 16 kB :-) --Steinar
741 const int maxlen = (f->ascii_mode == 1) ? 4096 : 16384;
743 const int maxlen = 16384;
747 size = recv(f->sock, upload_buf, maxlen, 0);
752 if (size > 0 && f->ascii_mode == 1) {
753 size = ascii_uploadfilter(upload_buf, size);
756 if (size > 0 && (write(f->local_file, upload_buf, size) == size)) {
758 } else if (size == -1) {
759 /* don't write xferlog... or? */
760 numeric(f->owner, 426, strerror(errno));
768 int do_download(struct ftran *f)
770 #if defined(TCP_CORK) && defined(SOL_TCP)
771 unsigned int zero = 0;
775 int more_to_send = 0;
778 char buf[MAX_BLOCK_SIZE];
781 char buf2[MAX_BLOCK_SIZE * 2];
785 #if HAVE_LINUX_SENDFILE
787 * We handle the optimal case first, which is sendfile().
788 * Here we use a rather simplified sending `algorithm',
789 * leaving most of the quirks to the system calls.
791 if (f->dir_listing == 0
797 size = f->size - f->pos;
799 if (size > f->block_size) size = f->block_size;
800 if (size < 0) size = 0;
803 if (size != f->block_size) {
804 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
808 err = sendfile(f->sock, f->local_file, &f->pos, size);
809 return (f->pos < f->size) && (err > -1);
814 size = f->size - f->pos;
816 if (size > f->block_size) size = f->block_size;
817 if (size < 0) size = 0;
819 bytes_to_send = size;
820 sendfrom_buf = f->file_data + f->pos;
822 bytes_to_send = read(f->local_file, buf, f->block_size);
826 if (bytes_to_send == f->block_size) more_to_send = 1;
829 if (f->ascii_mode == 1) {
830 bytes_to_send = ascii_downloadfilter(sendfrom_buf,
831 buf2, bytes_to_send);
834 #endif /* WANT_ASCII */
836 #if defined(TCP_CORK) && defined(SOL_TCP)
837 /* if we believe this is the last packet, unset TCP_CORK */
838 if (more_to_send == 0) {
839 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
843 size = send(f->sock, sendfrom_buf, bytes_to_send, 0);
844 if (size < bytes_to_send) more_to_send = 1;
847 if (f->ascii_mode == 1 && size < bytes_to_send && size > 0) {
848 size = ascii_findlength(sendfrom_buf, size);
853 if (size > 0) f->pos += size;
860 void write_xferlog(struct ftran *f)
863 time_t now = time(NULL);
864 struct tm *t = localtime(&now);
866 if (xferlog == NULL) return;
868 strftime(temp, 256, "%a %b %d %H:%M:%S %Y", t);
870 fprintf(xferlog, "%s %u %s %lu %s b _ %c a %s ftp 0 * \n",
872 fprintf(xferlog, "%s %u %s %lu %s b _ o a %s ftp 0 *\n",
874 temp, (int)(difftime(now, f->tran_start)),
875 inet_ntoa(f->sin.sin_addr), f->size,
878 (f->upload) ? 'i' : 'o',
884 /* vim needs this to work properly :-( */
891 /* Reallocate the buggers constantly */
894 struct conn *c = first_conn;
895 int maxloops = MAXCLIENTS;
897 while (c && c->next_conn) {
898 struct conn *temp = malloc(sizeof(*temp));
900 *temp = *(c->next_conn);
901 if (temp->transfer) temp->transfer->owner = temp;
902 memset(c->next_conn, 0, sizeof(struct conn));
908 assert(maxloops > 0);
914 * main(): Main function. Does the initialization, and contains
915 * the main server loop. Takes no command-line arguments
916 * (see README for justification).
923 /* the sets are declared globally if we use poll() */
925 fd_set fds, fds_send;
928 /*setlinebuf(stdout);*/
929 setvbuf(stdout, (char *)NULL, _IOLBF, 0);
931 signal(SIGPIPE, SIG_IGN);
933 printf("BetaFTPD version %s, Copyright (C) 1999-2000 Steinar H. Gunderson\n", VERSION);
934 puts("BetaFTPD comes with ABSOLUTELY NO WARRANTY; for details see the file");
935 puts("COPYING. This is free software, and you are welcome to redistribute it");
936 puts("under certain conditions; again see the file COPYING for details.");
939 /* we don't need stdin */
945 for (i = 0; i < FD_MAX; i++) {
951 FD_ZERO(&master_fds);
952 FD_ZERO(&master_send_fds);
955 server_sock = create_server_socket();
958 printf("%cc", (char)27); /* reset and clear the screen */
961 /* init dummy first connection */
962 first_conn = alloc_new_conn(-1);
963 first_ftran = alloc_new_ftran(0, NULL);
965 first_dcache = alloc_new_dcache();
970 #warning No xferlog support for nonroot yet
973 xferlog = fopen("/var/log/xferlog", "r+");
974 if (xferlog == NULL) xferlog = fopen("/usr/adm/xferlog", "r+");
976 if (xferlog != NULL) {
977 fseek(xferlog, 0L, SEEK_END);
986 puts("fork() failed, exiting");
991 puts("BetaFTPD forked into the background");
995 puts("BetaFTPD active");
998 /* set timeout alarm here (after the fork) */
1000 signal(SIGALRM, handle_alarm);
1005 struct timeval timeout;
1008 /*screw_clients(); //look for memory errors */
1011 update_display(first_conn);
1015 i = poll(fds, highest_fds + 1, 60000);
1019 for (j=0; j<=highest_fds; j++) {
1020 if (fds[j].revents) printf("fds[%d].fd %d, .revents %x\n", j, fds[j].fd, fds[j].revents);
1025 /* reset fds (gets changed by select()) */
1027 fds_send = master_send_fds;
1030 * wait up to 60 secs for any activity
1032 timeout.tv_sec = 60;
1033 timeout.tv_usec = 0;
1035 i = select(FD_SETSIZE, &fds, &fds_send, NULL, &timeout);
1039 if (errno == EBADF) {
1041 /* don't like this, but we have to */
1042 clear_bad_fds(&server_sock);
1044 } else if (errno != EINTR) {
1055 /* fix an invalid server socket */
1056 if (fds[server_sock].revents & POLLERR) {
1057 del_fd(server_sock);
1058 server_sock = create_server_socket();
1062 /* remove any timed out sockets */
1063 if (time_to_check) {
1071 if (i <= 0) continue;
1074 i -= process_all_sendfiles(i);
1075 process_all_clients(i);
1077 /* sends are given highest `priority' */
1078 i -= process_all_sendfiles(&fds_send, i);
1080 /* incoming PASV connections and uploads */
1081 i -= process_all_sendfiles(&fds, i);
1084 * check the incoming PASV connections first, so
1085 * process_all_clients() won't be confused.
1087 process_all_clients(&fds, i);
1091 if (fds[server_sock].revents & POLLIN) {
1093 if (FD_ISSET(server_sock, &fds)) {
1095 accept_new_client(&server_sock);
1102 * accept_new_client():
1103 * Open a socket for the new client, say hello and put it in
1106 void accept_new_client(int * const server_sock)
1108 struct sockaddr_in tempaddr;
1109 int tempaddr_len = sizeof(tempaddr);
1110 const int tempsock = accept(*server_sock, (struct sockaddr *)&tempaddr, &tempaddr_len);
1112 static int num_err = 0;
1119 if ((errno == EBADF || errno == EPIPE) && ++num_err >= 3) {
1120 del_fd(*server_sock);
1121 *server_sock = create_server_socket();
1124 struct conn * const c = alloc_new_conn(tempsock);
1127 numeric(c, 220, "BetaFTPD " VERSION " ready.");
1129 memcpy(&(c->addr), &tempaddr, sizeof(struct sockaddr));
1136 * time_out_sockets():
1137 * Times out any socket that has not had any transfer
1138 * in the last 15 minutes (delay not customizable by FTP
1139 * user -- you must change it in ftpd.h).
1141 * Note that RFC959 explicitly states that there are no
1142 * `spontaneous' error replies, yet we have to do it to
1143 * get the message through at all.
1145 * If we check this list for every accept() call, it's
1146 * actually eating a lot of CPU time, so we only check
1147 * it every minute. We used to do a time() call here,
1148 * but we've changed to do use an alarm() call and set
1149 * the time_to_check_flag in the SIGALRM handler.
1151 RETSIGTYPE handle_alarm(int signum)
1157 signal(SIGALRM, handle_alarm);
1160 void time_out_sockets()
1162 struct conn *c = NULL, *next = first_conn->next_conn;
1163 time_t now = time(NULL);
1165 /* run through the linked list */
1166 while (next != NULL) {
1168 next = c->next_conn;
1170 if ((c->transfer == NULL || c->transfer->state != 5) &&
1171 (now - c->last_transfer > TIMEOUT_SECS)) {
1172 /* RFC violation? */
1173 numeric(c, 421, "Timeout (%u minutes): Closing control connection.", TIMEOUT_SECS/60);
1181 * time_out_dcache():
1182 * Time out expired directory listing cache entries.
1183 * Uses much of the same code as time_out_sockets().
1185 void time_out_dcache()
1187 struct dcache *d = NULL, *next = first_dcache->next_dcache;
1188 time_t now = time(NULL);
1190 /* run through the linked list */
1191 while (next != NULL) {
1193 next = d->next_dcache;
1195 if (d->use_count == 0 && (now - d->last_used > 900)) {
1204 * Remove some bytes from the incoming buffer. This gives
1205 * room for new data on the control connection, and should
1206 * be called when the code has finished using the data.
1207 * (This is done automatically for all commands, so you
1208 * normally need not worry about it.)
1210 void remove_bytes(struct conn * const c, const int num)
1212 if (c->buf_len <= num) {
1216 memmove(c->recv_buf, c->recv_buf + num, c->buf_len);
1221 * numeric(): Sends a numeric FTP reply to the client. Note that
1222 * you can use this command much the same way as you
1223 * would use a printf() (with all the normal %s, %d,
1224 * etc.), since it actually uses printf() internally.
1226 void numeric(struct conn * const c, const int numeric, const char * const format, ...)
1228 char buf[256], fmt[256];
1232 snprintf(fmt, 256, "%03u %s\r\n", numeric, format);
1234 va_start(args, format);
1235 i = vsnprintf(buf, 256, fmt, args);
1238 err = send(c->sock, buf, i, 0);
1239 if (err == -1 && errno == EPIPE) {
1245 * init_file_transfer():
1246 * Initiate a data connection for sending. This does not open
1247 * any files etc., just does whatever is needed for the socket,
1248 * if needed. It does, however, send the 150 reply to the client,
1249 * and mmap()s if needed.
1251 * Linux systems (others?) define SOL_TCP right away, which saves us
1252 * some grief and code size. Perhaps using getprotoent() is the `right'
1253 * way, but it's bigger :-) (Optionally, we could figure it out at
1254 * configure time, of course...)
1256 * For optimal speed, we use the Linux 2.2.x-only TCP_CORK flag if
1257 * possible. Note that this is only defined in the first `arm' --
1258 * we silently assume that Linux is the only OS supporting this
1259 * flag. This might be an over-generalization, but I it looks like
1260 * we'll have to depend on it other places as well, so we might
1261 * just as well be evil here.
1263 void init_file_transfer(struct ftran * const f)
1266 struct conn * const c = f->owner;
1267 const int mode = IPTOS_THROUGHPUT, zero = 0, one = 1;
1272 /* we want max throughput */
1273 setsockopt(f->sock, SOL_IP, IP_TOS, (void *)&mode, sizeof(mode));
1274 setsockopt(f->sock, SOL_TCP, TCP_NODELAY, (void *)&zero, sizeof(zero));
1276 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&one, sizeof(one));
1279 /* should these pointers be freed afterwards? */
1281 getprotoent(); /* legal? */
1283 const struct protoent * const pe_ip = getprotobyname("ip");
1284 const struct protoent * const pe_tcp = getprotobyname("tcp");
1285 setsockopt(f->sock, pe_ip->p_proto, IP_TOS, (void *)&mode, sizeof(mode));
1286 setsockopt(f->sock, pe_tcp->p_proto, TCP_NODELAY, (void *)&zero, sizeof(zero));
1292 if (f->dir_listing) {
1293 f->block_size = MAX_BLOCK_SIZE;
1296 f->ascii_mode = f->owner->ascii_mode;
1299 /* find the preferred block size */
1300 f->block_size = MAX_BLOCK_SIZE;
1301 if (fstat(f->local_file, &buf) != -1 &&
1302 buf.st_blksize < MAX_BLOCK_SIZE) {
1303 f->block_size = buf.st_blksize;
1314 #endif /* WANT_UPLOAD */
1316 TRAP_ERROR(add_fd(f->sock, events), 500, return);
1320 setsockopt(f->sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
1322 #if !HAVE_POLL && WANT_UPLOAD
1324 * if we let an upload socket stay in master_send_fds, we would
1325 * get data that would fool us into closing the socket... (sigh)
1328 FD_CLR(f->sock, &master_send_fds);
1329 FD_SET(f->sock, &master_fds);
1333 time(&(f->owner->last_transfer));
1335 if (f->dir_listing) {
1337 numeric(f->owner, 150, "Opening ASCII mode data connection for directory listing.");
1340 * slightly kludged -- perhaps we should kill the second arm,
1341 * at the expense of code size? Or perhaps we could collapse
1342 * the two possible replies into one?
1348 #endif /* WANT_UPLOAD */
1350 numeric(f->owner, 150, "Opening %s mode data connection for '%s'",
1351 (f->ascii_mode) ? "ASCII" : "BINARY", f->filename);
1353 numeric(f->owner, 150, "Opening %s mode data connection for '%s' (%u bytes)",
1354 (f->ascii_mode) ? "ASCII" : "BINARY", f->filename,
1357 #else /* !WANT_ASCII */
1360 numeric(f->owner, 150, "Opening BINARY mode data connection for '%s'", f->filename);
1362 #endif /* WANT_UPLOAD */
1363 numeric(f->owner, 150, "Opening BINARY mode data connection for '%s' (%u bytes)", f->filename, f->size);
1364 #endif /* !WANT_ASCII */
1368 * This section _could_ in theory be more optimized, but it's
1369 * much easier this way, and hopefully, the compiler will be
1370 * intelligent enough to optimize most of this away. The idea
1371 * is, some modes _require_ use of mmap (or not). The preferred
1372 * thing is using mmap() when we don't have sendfile(), and not
1373 * using mmap() when we have sendfile().
1376 if (f->dir_listing == 0) {
1377 #if HAVE_LINUX_SENDFILE
1383 if (f->ascii_mode == 1) do_mmap = 1;
1386 if (f->upload == 1) do_mmap = 0;
1390 f->file_data = mmap(NULL, f->size, PROT_READ, MAP_SHARED, f->local_file, 0);
1391 if (f->file_data == MAP_FAILED) f->file_data = NULL;
1393 f->file_data = NULL;
1395 f->pos = f->owner->rest_pos;
1397 #else /* !HAVE_MMAP */
1398 lseek(f->local_file, f->owner->rest_pos, SEEK_SET);
1403 * create_server_socket():
1404 * Create and bind a server socket, that we can use to
1405 * listen to new clients on.
1407 int create_server_socket()
1409 int server_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1410 const unsigned int one = 1;
1411 struct sockaddr_in addr;
1415 * In the `perfect' world, if an address was in use, we could
1416 * just wait for the kernel to clear everything up, and everybody
1417 * would be happy. But when you just found out your server socket
1418 * was invalid, it has to be `re-made', and 3000 users are trying
1419 * to access your fileserver, I think it's nice that it comes
1420 * up right away... hence this option.
1422 setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
1423 ioctl(server_sock, FIONBIO, &one); /* just in case */
1425 addr.sin_family = AF_INET;
1426 addr.sin_addr.s_addr = INADDR_ANY;
1427 addr.sin_port = htons(FTP_PORT);
1430 err = bind(server_sock, (struct sockaddr *)&addr, sizeof(struct sockaddr));
1435 /* try to recover from recoverable errors... */
1436 if (errno == ENOMEM || errno == EADDRINUSE) {
1437 puts("Waiting 1 sec before trying again...");
1444 } while (err == -1);
1446 listen(server_sock, 20);
1448 err = add_fd(server_sock, POLLIN);
1460 * Try to find invalid socket descriptors, and clean them.
1461 * The methods used are rather UGLY, but I can't think of
1462 * any good way of checking e.g. server_sock without
1463 * doing anything to it :-(
1465 * poll() is able to do this in a much cleaner way, which
1466 * we use if we use poll(). That checking isn't done here,
1469 void clear_bad_fds(int * const server_sock)
1473 struct timeval tv = { 0, 0 };
1476 FD_SET(*server_sock, &fds);
1477 if (select(*server_sock, &fds, NULL, NULL, &tv) == -1) {
1478 FD_CLR(*server_sock, &master_fds);
1479 close(*server_sock);
1480 *server_sock = create_server_socket();
1484 /* could do this (conn, ftran) in any order */
1486 struct conn *c = NULL, *next = first_conn->next_conn;
1488 /* run through the linked list */
1489 while (next != NULL) {
1493 next = c->next_conn;
1495 if (read(c->sock, &buf, 0) == -1 &&
1503 struct ftran *f = NULL, *next = first_ftran->next_ftran;
1505 while (next != NULL) {
1509 next = f->next_ftran;
1511 if (read(f->sock, &buf, 0) == -1 &&
1522 * dump_file(): Dumps a file on the control connection. Used for
1523 * welcome messages and the likes. Note that outbuf
1524 * is so big, to prevent any crashing from users creating
1525 * weird .message files (like 1024 LFs)... The size of
1526 * the file is limited to 1024 bytes (by truncation).
1528 void dump_file(struct conn * const c, const int num, const char * const filename)
1530 char buf[1024], outbuf[5121];
1531 char *ptr = outbuf + 4;
1534 const int dumpfile = open(filename, O_RDONLY);
1535 if (dumpfile == -1) return;
1537 i = read(dumpfile, buf, 1024);
1543 sprintf(outbuf, "%03u-", num);
1546 if (buf[j] == '\n') {
1547 sprintf(ptr, "%03u-", num);
1553 send(c->sock, outbuf, ptr - outbuf, 0);
1560 * Lists all README file in the current (ie. OS current)
1561 * directory, in a 250- message.
1563 void list_readmes(struct conn * const c)
1566 const time_t now = time(NULL);
1569 if (glob("README*", 0, NULL, &pglob) != 0) return;
1571 for (i = 0; i < pglob.gl_pathc; i++) {
1576 if (stat(pglob.gl_pathv[i], &buf) == -1) continue;
1578 /* remove trailing LF */
1579 tm = ctime(&buf.st_mtime);
1580 tm[strlen(tm) - 1] = 0;
1582 snprintf(str, 256, "250-Please read the file %s\r\n"
1583 "250-\tIt was last modified %s - %ld days ago\r\n",
1584 pglob.gl_pathv[i], tm,
1585 (now - buf.st_mtime) / 86400);
1586 send(c->sock, str, strlen(str), 0);