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 of 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
76 #include <arpa/inet.h>
84 #include <sys/ioctl.h>
87 #if HAVE_NETINET_IN_SYSTM_H
88 #include <netinet/in_systm.h>
92 #include <netinet/ip.h>
95 #if HAVE_NETINET_TCP_H
96 #include <netinet/tcp.h>
99 #if HAVE_LINUX_SOCKET_H
100 #include <linux/socket.h>
104 #include <linux/tcp.h>
108 #include <sys/mman.h>
116 #include <sys/time.h>
120 #include <sys/time.h>
124 #include <sys/filio.h>
139 #if HAVE_SYS_SIGNAL_H
140 #include <sys/signal.h>
144 #include <sys/poll.h>
147 #if HAVE_SYS_SENDFILE_H
148 #include <sys/sendfile.h>
152 * <linux/socket.h> does not export this to glibc2 systems, and it isn't
153 * always defined anywhere else.
155 #if !defined(TCP_CORK) && defined(__linux__)
171 #define MAP_FAILED -1
174 struct conn *first_conn = NULL;
175 struct ftran *first_ftran = NULL;
177 struct dcache *first_dcache = NULL;
181 unsigned int highest_fds = 0;
185 struct pollfd fds[FD_MAX];
187 #define MAXCLIENTS FD_MAX
189 fd_set master_fds, master_send_fds;
190 #define MAXCLIENTS FD_SETSIZE
194 FILE *xferlog = NULL;
197 #if HAVE_LINUX_SENDFILE
198 int sendfile_supported = 1;
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 * Destroy a control connection, remove it from the linked
445 * list, and clean up after it.
447 void destroy_conn(struct conn * const c)
449 if (c == NULL) return;
452 destroy_ftran(c->transfer);
453 remove_from_linked_list((struct list_element *)c);
458 * Destroy a data connection, remove it from the linked list,
459 * and clean up after it.
461 * For some reason, TCP_CORK (Linux 2.2.x-only) doesn't flush
462 * even _after_ the socket is closed, so we zero it just before
463 * closing. We also zero just before sending the last packet,
464 * as it seems to be needed on some systems.
466 * If you wonder why I check for `defined(SOL_TCP)' and don't
467 * provide an alternative, see the comments on init_file_transfer().
469 void destroy_ftran(struct ftran * const f)
471 const unsigned int zero = 0;
473 if (f == NULL) return;
474 #if defined(TCP_CORK) && defined(SOL_TCP)
475 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
481 time(&(f->dir_cache->last_used));
482 f->dir_cache->use_count--;
488 if (f->dir_listing) {
492 munmap(f->file_data, f->size);
498 if (f->local_file != -1) close(f->local_file);
501 if (f->dir_listing) unlink(f->filename);
504 f->owner->transfer = NULL;
507 if (f->dir_cache != NULL) f->dir_cache->use_count--;
510 remove_from_linked_list((struct list_element *)f);
514 * process_all_clients():
515 * Processes all the _control_ connections in active_clients
516 * (normally returned from a select(), there are at max
517 * NUM_AC active connections in the set), sending them
518 * through to the command parser if a command has been
522 int process_all_clients(const int num_ac)
524 int process_all_clients(const fd_set * const active_clients, const int num_ac)
527 struct conn *c = NULL, *next = first_conn->next_conn;
528 int checked_through = 0;
530 /* run through the linked list */
531 while (next != NULL && checked_through < num_ac) {
537 if ((fds[c->sock].revents & (POLLIN|POLLERR|POLLHUP|POLLNVAL)) == 0) {
541 if (!FD_ISSET(c->sock, active_clients)) {
548 bytes_avail = recv(c->sock, c->recv_buf + c->buf_len,
549 255 - c->buf_len, 0);
550 if (bytes_avail <= 0) {
552 * select() has already told us there's something about
553 * this socket, so if we get a return value of zero, the
554 * client has closed the socket. If we get a return value
555 * of -1 (error), we close the socket ourselves.
557 * We do the same for poll(), even though we actually have
558 * bits that tell us what is happening (in case of new
559 * input AND error/hangup at the same time, we do an
560 * explicit check at the bottom of the loop as well).
566 /* overrun = disconnect */
567 if (c->buf_len + bytes_avail > 254) {
568 numeric(c, 503, "Buffer overrun; disconnecting.");
573 c->buf_len += bytes_avail;
576 if (fds[c->sock].revents & (POLLERR|POLLHUP|POLLNVAL)) {
580 return checked_through;
585 * Send a message that the transfer is completed, write xferlog
586 * entry (optional), and update the last_transfer record in the
587 * file transfer object. Goes for both uploads and downloads.
589 void finish_transfer(struct ftran * const f)
591 numeric(f->owner, 226, "Transfer complete.");
592 time(&(f->owner->last_transfer));
595 if (!f->dir_listing) {
602 update_display(first_conn);
607 * process_all_sendfiles():
608 * Sends data to all clients that are ready to receive it.
609 * Also checks for data connections that are newly-connected,
610 * and handler xferlog entries for the files that are finished.
613 int process_all_sendfiles(const int num_ac)
615 int process_all_sendfiles(fd_set * const active_clients, const int num_ac)
618 struct ftran *f = NULL, *next = first_ftran->next_ftran;
619 int checked_through = 0;
620 struct sockaddr tempaddr;
621 int tempaddr_len = sizeof(tempaddr);
623 while (next != NULL && checked_through < num_ac) {
625 next = f->next_ftran;
628 if (f->upload == 1 && fds[f->sock].revents & POLLHUP) {
635 if (fds[f->sock].revents & (POLLERR|POLLNVAL|POLLHUP)) {
641 /* state = 2: incoming PASV, state >3: send file */
643 if ((f->state < 2) || (f->state == 3) || (fds[f->sock].revents & (POLLIN|POLLOUT)) == 0) {
645 if ((f->state < 2) || (f->state == 3) || !FD_ISSET(f->sock, active_clients)) {
653 /* Nothing is needed for the poll() version? */
655 FD_CLR(f->sock, active_clients);
658 if (f->state == 2) { /* incoming PASV */
659 const unsigned int one = 1;
660 const int tempsock = accept(f->sock, (struct sockaddr *)&tempaddr,
665 if (tempsock == -1) {
671 ioctl(f->sock, FIONBIO, &one);
672 init_file_transfer(f);
674 if (f->upload) continue;
678 init_file_transfer(f);
680 if (f->upload) continue;
684 /* for download, we send the first packets right away */
687 if (do_upload(f)) continue;
690 if (do_download(f)) continue;
692 /* do_{upload,download} returned 0, the transfer is complete */
695 update_display(first_conn);
699 return checked_through;
703 int do_upload(struct ftran *f)
705 char upload_buf[16384];
708 /* keep buffer size small in ascii transfers
709 to prevent process stalling while filtering
710 data on slower computers */
713 * This isn't a big problem, since we won't get
714 * packets this big anyway, the biggest I've seen
715 * was 12kB on 100mbit (but that was from a Windows
716 * machine), so I've reduced the buffer from 64 kB
717 * to 16 kB :-) --Steinar
719 const int maxlen = (f->ascii_mode == 1) ? 4096 : 16384;
721 const int maxlen = 16384;
725 size = recv(f->sock, upload_buf, maxlen, 0);
730 if (size > 0 && f->ascii_mode == 1) {
731 size = ascii_uploadfilter(upload_buf, size);
734 if (size > 0 && (write(f->local_file, upload_buf, size) == size)) {
736 } else if (size == -1) {
737 /* don't write xferlog... or? */
738 numeric(f->owner, 426, strerror(errno));
746 int do_download(struct ftran *f)
748 #if defined(TCP_CORK) && defined(SOL_TCP)
749 unsigned int zero = 0;
753 int more_to_send = 0;
756 char buf[MAX_BLOCK_SIZE];
759 char buf2[MAX_BLOCK_SIZE * 2];
763 #if HAVE_LINUX_SENDFILE
765 * We handle the optimal case first, which is sendfile().
766 * Here we use a rather simplified sending `algorithm',
767 * leaving most of the quirks to the system calls.
769 if (sendfile_supported == 1 && f->dir_listing == 0) {
771 size = f->size - f->pos;
773 if (size > f->block_size) size = f->block_size;
774 if (size < 0) size = 0;
777 if (size != f->block_size) {
778 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
782 err = sendfile(f->sock, f->local_file, &f->pos, size);
783 return (f->pos < f->size) && (err > -1);
788 size = f->size - f->pos;
790 if (size > f->block_size) size = f->block_size;
791 if (size < 0) size = 0;
793 bytes_to_send = size;
794 sendfrom_buf = f->file_data + f->pos;
796 bytes_to_send = read(f->local_file, buf, f->block_size);
800 if (bytes_to_send == f->block_size) more_to_send = 1;
803 if (f->ascii_mode == 1) {
804 bytes_to_send = ascii_downloadfilter(sendfrom_buf,
805 buf2, bytes_to_send);
808 #endif /* WANT_ASCII */
810 #if defined(TCP_CORK) && defined(SOL_TCP)
811 /* if we believe this is the last packet, unset TCP_CORK */
812 if (more_to_send == 0) {
813 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
817 size = send(f->sock, sendfrom_buf, bytes_to_send, 0);
818 if (size < bytes_to_send) more_to_send = 1;
821 if (f->ascii_mode == 1 && size < bytes_to_send && size > 0) {
822 size = ascii_findlength(sendfrom_buf, size);
827 if (size > 0) f->pos += size;
834 void write_xferlog(struct ftran *f)
837 time_t now = time(NULL);
838 struct tm *t = localtime(&now);
840 if (xferlog == NULL) return;
842 strftime(temp, 256, "%a %b %d %H:%M:%S %Y", t);
844 fprintf(xferlog, "%s %u %s %lu %s b _ %c a %s ftp 0 * \n",
846 fprintf(xferlog, "%s %u %s %lu %s b _ o a %s ftp 0 *\n",
848 temp, (int)(difftime(now, f->tran_start)),
849 inet_ntoa(f->sin.sin_addr), f->size,
852 (f->upload) ? 'i' : 'o',
858 /* vim needs this to work properly :-( */
865 /* Reallocate the buggers constantly */
868 struct conn *c = first_conn;
869 int maxloops = MAXCLIENTS;
871 while (c && c->next_conn) {
872 struct conn *temp = malloc(sizeof(*temp));
874 *temp = *(c->next_conn);
875 if (temp->transfer) temp->transfer->owner = temp;
876 memset(c->next_conn, 0, sizeof(struct conn));
882 assert(maxloops > 0);
888 * main(): Main function. Does the initialization, and contains
889 * the main server loop. Takes no command-line arguments
890 * (see README for justification).
897 /* the sets are declared globally if we use poll() */
899 fd_set fds, fds_send;
902 /*setlinebuf(stdout);*/
903 setvbuf(stdout, (char *)NULL, _IOLBF, 0);
905 signal(SIGPIPE, SIG_IGN);
907 printf("BetaFTPD version %s, Copyright (C) 1999-2000 Steinar H. Gunderson\n", VERSION);
908 puts("BetaFTPD comes with ABSOLUTELY NO WARRANTY; for details see the file");
909 puts("COPYING. This is free software, and you are welcome to redistribute it");
910 puts("under certain conditions; again see the file COPYING for details.");
913 /* we don't need stdin */
919 for (i = 0; i < FD_MAX; i++) {
925 FD_ZERO(&master_fds);
926 FD_ZERO(&master_send_fds);
929 server_sock = create_server_socket();
932 printf("%cc", (char)27); /* reset and clear the screen */
935 /* init dummy first connection */
936 first_conn = alloc_new_conn(-1);
937 first_ftran = alloc_new_ftran(0, NULL);
939 first_dcache = alloc_new_dcache();
944 #warning No xferlog support for nonroot yet
947 xferlog = fopen("/var/log/xferlog", "r+");
948 if (xferlog == NULL) xferlog = fopen("/usr/adm/xferlog", "r+");
950 if (xferlog != NULL) {
951 fseek(xferlog, 0L, SEEK_END);
960 puts("fork() failed, exiting");
965 puts("BetaFTPD forked into the background");
969 puts("BetaFTPD active");
972 /* set timeout alarm here (after the fork) */
974 signal(SIGALRM, handle_alarm);
976 #if HAVE_LINUX_SENDFILE
977 /* check that sendfile() is really implemented (same check as configure does) */
979 int out_fd = 1, in_fd = 0;
984 sendfile(out_fd, in_fd, &offset, size);
985 if (errno == ENOSYS) sendfile_supported = 0;
992 struct timeval timeout;
995 /*screw_clients(); //look for memory errors */
998 update_display(first_conn);
1002 i = poll(fds, highest_fds + 1, 60000);
1006 for (j=0; j<=highest_fds; j++) {
1007 if (fds[j].revents) printf("fds[%d].fd %d, .revents %x\n", j, fds[j].fd, fds[j].revents);
1012 /* reset fds (gets changed by select()) */
1014 fds_send = master_send_fds;
1017 * wait up to 60 secs for any activity
1019 timeout.tv_sec = 60;
1020 timeout.tv_usec = 0;
1022 i = select(FD_SETSIZE, &fds, &fds_send, NULL, &timeout);
1026 if (errno == EBADF) {
1028 /* don't like this, but we have to */
1029 clear_bad_fds(&server_sock);
1031 } else if (errno != EINTR) {
1042 /* fix an invalid server socket */
1043 if (fds[server_sock].revents & POLLERR) {
1044 del_fd(server_sock);
1045 server_sock = create_server_socket();
1049 /* remove any timed out sockets */
1050 if (time_to_check) {
1058 if (i <= 0) continue;
1061 i -= process_all_sendfiles(i);
1062 process_all_clients(i);
1064 /* sends are given highest `priority' */
1065 i -= process_all_sendfiles(&fds_send, i);
1067 /* incoming PASV connections and uploads */
1068 i -= process_all_sendfiles(&fds, i);
1071 * check the incoming PASV connections first, so
1072 * process_all_clients() won't be confused.
1074 process_all_clients(&fds, i);
1078 if (fds[server_sock].revents & POLLIN) {
1080 if (FD_ISSET(server_sock, &fds)) {
1082 accept_new_client(&server_sock);
1089 * accept_new_client():
1090 * Open a socket for the new client, say hello and put it in
1093 void accept_new_client(int * const server_sock)
1095 struct sockaddr_in tempaddr;
1096 int tempaddr_len = sizeof(tempaddr);
1097 const int tempsock = accept(*server_sock, (struct sockaddr *)&tempaddr, &tempaddr_len);
1099 static int num_err = 0;
1106 if ((errno == EBADF || errno == EPIPE) && ++num_err >= 3) {
1107 del_fd(*server_sock);
1108 *server_sock = create_server_socket();
1111 struct conn * const c = alloc_new_conn(tempsock);
1114 numeric(c, 220, "BetaFTPD " VERSION " ready.");
1116 memcpy(&(c->addr), &tempaddr, sizeof(struct sockaddr));
1123 * time_out_sockets():
1124 * Times out any socket that has not had any transfer
1125 * in the last 15 minutes (delay not customizable by FTP
1126 * user -- you must change it in ftpd.h).
1128 * Note that RFC959 explicitly states that there are no
1129 * `spontaneous' error replies, yet we have to do it to
1130 * get the message through at all.
1132 * If we check this list for every accept() call, it's
1133 * actually eating a lot of CPU time, so we only check
1134 * it every minute. We used to do a time() call here,
1135 * but we've changed to do use an alarm() call and set
1136 * the time_to_check_flag in the SIGALRM handler.
1138 RETSIGTYPE handle_alarm(int signum)
1144 signal(SIGALRM, handle_alarm);
1147 void time_out_sockets()
1149 struct conn *c = NULL, *next = first_conn->next_conn;
1150 time_t now = time(NULL);
1152 /* run through the linked list */
1153 while (next != NULL) {
1155 next = c->next_conn;
1157 if ((c->transfer == NULL || c->transfer->state != 5) &&
1158 (now - c->last_transfer > TIMEOUT_SECS)) {
1159 /* RFC violation? */
1160 numeric(c, 421, "Timeout (%u minutes): Closing control connection.", TIMEOUT_SECS/60);
1168 * Remove some bytes from the incoming buffer. This gives
1169 * room for new data on the control connection, and should
1170 * be called when the code has finished using the data.
1171 * (This is done automatically for all commands, so you
1172 * normally need not worry about it.)
1174 void remove_bytes(struct conn * const c, const int num)
1176 if (c->buf_len <= num) {
1180 memmove(c->recv_buf, c->recv_buf + num, c->buf_len);
1185 * numeric(): Sends a numeric FTP reply to the client. Note that
1186 * you can use this command much the same way as you
1187 * would use a printf() (with all the normal %s, %d,
1188 * etc.), since it actually uses printf() internally.
1190 void numeric(struct conn * const c, const int numeric, const char * const format, ...)
1192 char buf[256], fmt[256];
1196 snprintf(fmt, 256, "%03u %s\r\n", numeric, format);
1198 va_start(args, format);
1199 i = vsnprintf(buf, 256, fmt, args);
1202 err = send(c->sock, buf, i, 0);
1203 if (err == -1 && errno == EPIPE) {
1209 * init_file_transfer():
1210 * Initiate a data connection for sending. This does not open
1211 * any files etc., just does whatever is needed for the socket,
1212 * if needed. It does, however, send the 150 reply to the client,
1213 * and mmap()s if needed.
1215 * Linux systems (others?) define SOL_TCP right away, which saves us
1216 * some grief and code size. Perhaps using getprotoent() is the `right'
1217 * way, but it's bigger :-) (Optionally, we could figure it out at
1218 * configure time, of course...)
1220 * For optimal speed, we use the Linux 2.2.x-only TCP_CORK flag if
1221 * possible. Note that this is only defined in the first `arm' --
1222 * we silently assume that Linux is the only OS supporting this
1223 * flag. This might be an over-generalization, but I it looks like
1224 * we'll have to depend on it other places as well, so we might
1225 * just as well be evil here.
1227 void init_file_transfer(struct ftran * const f)
1230 struct conn * const c = f->owner;
1231 const int mode = IPTOS_THROUGHPUT, zero = 0, one = 1;
1236 /* we want max throughput */
1237 setsockopt(f->sock, SOL_IP, IP_TOS, (void *)&mode, sizeof(mode));
1238 setsockopt(f->sock, SOL_TCP, TCP_NODELAY, (void *)&zero, sizeof(zero));
1240 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&one, sizeof(one));
1243 /* should these pointers be freed afterwards? */
1245 getprotoent(); /* legal? */
1247 const struct protoent * const pe_ip = getprotobyname("ip");
1248 const struct protoent * const pe_tcp = getprotobyname("tcp");
1249 setsockopt(f->sock, pe_ip->p_proto, IP_TOS, (void *)&mode, sizeof(mode));
1250 setsockopt(f->sock, pe_tcp->p_proto, TCP_NODELAY, (void *)&zero, sizeof(zero));
1256 if (f->dir_listing) {
1257 f->block_size = MAX_BLOCK_SIZE;
1260 f->ascii_mode = f->owner->ascii_mode;
1263 /* find the preferred block size */
1264 f->block_size = MAX_BLOCK_SIZE;
1265 if (fstat(f->local_file, &buf) != -1 &&
1266 buf.st_blksize < MAX_BLOCK_SIZE) {
1267 f->block_size = buf.st_blksize;
1278 #endif /* WANT_UPLOAD */
1280 TRAP_ERROR(add_fd(f->sock, events), 500, return);
1284 setsockopt(f->sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
1286 #if !HAVE_POLL && WANT_UPLOAD
1288 * if we let an upload socket stay in master_send_fds, we would
1289 * get data that would fool us into closing the socket... (sigh)
1292 FD_CLR(f->sock, &master_send_fds);
1293 FD_SET(f->sock, &master_fds);
1297 time(&(f->owner->last_transfer));
1299 if (f->dir_listing) {
1301 numeric(f->owner, 150, "Opening ASCII mode data connection for directory listing.");
1304 * slightly kludged -- perhaps we should kill the second arm,
1305 * at the expense of code size? Or perhaps we could collapse
1306 * the two possible replies into one?
1312 #endif /* WANT_UPLOAD */
1314 numeric(f->owner, 150, "Opening %s mode data connection for '%s'",
1315 (f->ascii_mode) ? "ASCII" : "BINARY", f->filename);
1317 numeric(f->owner, 150, "Opening %s mode data connection for '%s' (%u bytes)",
1318 (f->ascii_mode) ? "ASCII" : "BINARY", f->filename,
1321 #else /* !WANT_ASCII */
1324 numeric(f->owner, 150, "Opening BINARY mode data connection for '%s'", f->filename);
1326 #endif /* WANT_UPLOAD */
1327 numeric(f->owner, 150, "Opening BINARY mode data connection for '%s' (%u bytes)", f->filename, f->size);
1328 #endif /* !WANT_ASCII */
1332 * This section _could_ in theory be more optimized, but it's
1333 * much easier this way, and hopefully, the compiler will be
1334 * intelligent enough to optimize most of this away. The idea
1335 * is, some modes _require_ use of mmap (or not). The preferred
1336 * thing is using mmap() when we don't have sendfile(), and not
1337 * using mmap() when we have sendfile().
1340 if (f->dir_listing == 0) {
1341 #if HAVE_LINUX_SENDFILE
1342 int do_mmap = (sendfile_supported) ? 0 : 1;
1347 if (f->ascii_mode == 1) do_mmap = 1;
1350 if (f->upload == 1) do_mmap = 0;
1354 f->file_data = mmap(NULL, f->size, PROT_READ, MAP_SHARED, f->local_file, 0);
1355 if (f->file_data == MAP_FAILED) f->file_data = NULL;
1357 f->file_data = NULL;
1359 f->pos = f->owner->rest_pos;
1361 #else /* !HAVE_MMAP */
1362 lseek(f->local_file, f->owner->rest_pos, SEEK_SET);
1367 * create_server_socket():
1368 * Create and bind a server socket, that we can use to
1369 * listen to new clients on.
1371 int create_server_socket()
1373 int server_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1374 const unsigned int one = 1;
1375 struct sockaddr_in addr;
1379 * In the `perfect' world, if an address was in use, we could
1380 * just wait for the kernel to clear everything up, and everybody
1381 * would be happy. But when you just found out your server socket
1382 * was invalid, it has to be `re-made', and 3000 users are trying
1383 * to access your fileserver, I think it's nice that it comes
1384 * up right away... hence this option.
1386 setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
1387 ioctl(server_sock, FIONBIO, &one); /* just in case */
1389 addr.sin_family = AF_INET;
1390 addr.sin_addr.s_addr = INADDR_ANY;
1391 addr.sin_port = htons(FTP_PORT);
1394 err = bind(server_sock, (struct sockaddr *)&addr, sizeof(struct sockaddr));
1399 /* try to recover from recoverable errors... */
1400 if (errno == ENOMEM || errno == EADDRINUSE) {
1401 puts("Waiting 1 sec before trying again...");
1408 } while (err == -1);
1410 listen(server_sock, 20);
1412 err = add_fd(server_sock, POLLIN);
1424 * Try to find invalid socket descriptors, and clean them.
1425 * The methods used are rather UGLY, but I can't think of
1426 * any good way of checking e.g. server_sock without
1427 * doing anything to it :-(
1429 * poll() is able to do this in a much cleaner way, which
1430 * we use if we use poll(). That checking isn't done here,
1433 void clear_bad_fds(int * const server_sock)
1437 struct timeval tv = { 0, 0 };
1440 FD_SET(*server_sock, &fds);
1441 if (select(*server_sock, &fds, NULL, NULL, &tv) == -1) {
1442 FD_CLR(*server_sock, &master_fds);
1443 close(*server_sock);
1444 *server_sock = create_server_socket();
1448 /* could do this (conn, ftran) in any order */
1450 struct conn *c = NULL, *next = first_conn->next_conn;
1452 /* run through the linked list */
1453 while (next != NULL) {
1457 next = c->next_conn;
1459 if (read(c->sock, &buf, 0) == -1 &&
1467 struct ftran *f = NULL, *next = first_ftran->next_ftran;
1469 while (next != NULL) {
1473 next = f->next_ftran;
1475 if (read(f->sock, &buf, 0) == -1 &&
1486 * dump_file(): Dumps a file on the control connection. Used for
1487 * welcome messages and the likes. Note that outbuf
1488 * is so big, to prevent any crashing from users creating
1489 * weird .message files (like 1024 LFs)... The size of
1490 * the file is limited to 1024 bytes (by truncation).
1492 void dump_file(struct conn * const c, const int num, const char * const filename)
1494 char buf[1024], outbuf[5121];
1495 char *ptr = outbuf + 4;
1498 const int dumpfile = open(filename, O_RDONLY);
1499 if (dumpfile == -1) return;
1501 i = read(dumpfile, buf, 1024);
1507 sprintf(outbuf, "%03u-", num);
1510 if (buf[j] == '\n') {
1511 sprintf(ptr, "%03u-", num);
1517 send(c->sock, outbuf, ptr - outbuf, 0);
1524 * Lists all README file in the current (ie. OS current)
1525 * directory, in a 250- message.
1527 void list_readmes(struct conn * const c)
1530 const time_t now = time(NULL);
1533 if (glob("README*", 0, NULL, &pglob) != 0) return;
1535 for (i = 0; i < pglob.gl_pathc; i++) {
1540 if (stat(pglob.gl_pathv[i], &buf) == -1) continue;
1542 /* remove trailing LF */
1543 tm = ctime(&buf.st_mtime);
1544 tm[strlen(tm) - 1] = 0;
1546 snprintf(str, 256, "250-Please read the file %s\r\n"
1547 "250-\tIt was last modified %s - %ld days ago\r\n",
1548 pglob.gl_pathv[i], tm,
1549 (now - buf.st_mtime) / 86400);
1550 send(c->sock, str, strlen(str), 0);