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 <linux/tcp.h>
120 #include <sys/mman.h>
128 #include <sys/time.h>
132 #include <sys/time.h>
136 #include <sys/filio.h>
151 #if HAVE_SYS_SIGNAL_H
152 #include <sys/signal.h>
156 #include <sys/poll.h>
159 #if HAVE_SYS_SENDFILE_H
160 #include <sys/sendfile.h>
164 * <linux/socket.h> does not export this to glibc2 systems, and it isn't
165 * always defined anywhere else.
167 #if !defined(TCP_CORK) && defined(__linux__)
183 #define MAP_FAILED -1
186 struct conn *first_conn = NULL;
187 struct ftran *first_ftran = NULL;
189 struct dcache *first_dcache = NULL;
193 unsigned int highest_fds = 0;
197 struct pollfd fds[FD_MAX];
199 #define MAXCLIENTS FD_MAX
201 fd_set master_fds, master_send_fds;
202 #define MAXCLIENTS FD_SETSIZE
206 FILE *xferlog = NULL;
209 #if HAVE_LINUX_SENDFILE
210 int sendfile_supported = 1;
214 * This variable specifies if it's soon time to check for timed out
215 * clients, and timed out directory listing cache entries. It is
216 * set to 1 by a signal handler every minute, and set to 0 when the
217 * checking has been performed.
219 int time_to_check = 1;
223 * snprintf(): snprintf() replacement for systems that miss it. Note
224 * that this implementation does _not_ necessarily protect
225 * against all buffer overflows. Get a real snprintf() in
226 * your C library. That being said, the 8k limit is
227 * substantially larger than any other string in BetaFTPD,
228 * which should make such an attack harder.
230 int snprintf(char *str, size_t n, const char *format, ...)
236 va_start(args, format);
237 err = vsprintf(buf, format, args);
247 #ifndef HAVE_VSNPRINTF
249 * vsnprintf: vsnprintf() replacement for systems that miss it. Please
250 * see snprintf (above) for more information.
252 int vsnprintf(char *str, size_t n, const char *format, va_list ap)
257 err = vsprintf(buf, format, ap);
265 * add_fd(): Add an fd to the set we monitor. Return 0 on success.
266 * This code is shared between poll() and select() versions.
268 int add_fd(const int fd, const int events)
272 printf("add_fd(%d, %x): failed\n", fd, events);
277 fds[fd].events = events;
278 if (highest_fds < fd)
281 if (fd >= FD_SETSIZE)
284 FD_SET(fd, &master_fds);
285 if (events & POLLOUT)
286 FD_SET(fd, &master_send_fds);
292 * del_fd(): Close and remove an fd from the set(s) we monitor. (See also add_fd().)
294 void del_fd(const int fd)
303 /* Reduce poll()'s workload by not making it watch past end of array */
304 while ((highest_fds > 0) && (fds[highest_fds].fd == -1))
307 if (fd >= FD_SETSIZE)
309 FD_CLR(fd, &master_fds);
310 FD_CLR(fd, &master_send_fds);
319 struct conn *c = first_conn;
320 printf("list_clients:\n");
321 while (c && c->next_conn) {
323 printf("list_clients: fd %d\n", c->sock);
329 * add_to_linked_list():
330 * Inserts an element (conn, ftran or dcache) into its linked list.
331 * The list is placed at the beginning, right after the (bogus)
332 * first element of the list.
334 void add_to_linked_list(struct list_element * const first,
335 struct list_element * const elem)
340 elem->next = first->next;
341 if (elem->next) elem->next->prev = elem;
344 /* this is the bogus head of the list */
350 * remove_from_linked_list():
351 * Removes an element (conn, ftran or dcache) from its linked list,
354 void remove_from_linked_list(struct list_element * const elem)
356 if (elem->prev != NULL) elem->prev->next = elem->next;
357 if (elem->next != NULL) elem->next->prev = elem->prev;
363 * Allocates a new control connection (type `struct conn'),
364 * initializes it, and adds it to the linked list. The connection
365 * operates on the socket SOCK.
367 struct conn *alloc_new_conn(const int sock)
369 const unsigned int one = 1;
370 struct conn *c = (struct conn *)(malloc(sizeof(struct conn)));
372 if (c == NULL) return c;
375 ioctl(sock, FIONBIO, &one);
376 if (add_fd(sock, POLLIN) != 0) {
378 send(sock, "230 Server too busy, please try again later.\r\n", 46, 0);
383 add_to_linked_list((struct list_element *)first_conn,
384 (struct list_element *)c);
386 /* this is the bogus head of the list */
393 c->buf_len = c->auth = c->rest_pos = 0;
400 * strcpy(c->curr_dir, "/");
401 * strcpy(c->last_cmd, "");
402 * strcpy(c->rename_from, "")
404 c->curr_dir[0] = '/';
406 c->curr_dir[1] = c->last_cmd[0] = c->rename_from[0] = '\0';
408 c->curr_dir[1] = c->rename_from[0] = '\0';
411 time(&(c->last_transfer));
420 * Allocates a new data connection (type `struct ftran'), and
421 * adds it to the linked list. The connection operates on the
422 * socket SOCK, and has the control connection C as its parent.
424 struct ftran *alloc_new_ftran(const int sock, const struct conn * const c)
426 struct ftran *f = (struct ftran *)(malloc(sizeof(struct ftran)));
428 if (f == NULL) return f;
430 /* this is the bogus head of the list */
431 f->next_ftran = NULL;
432 f->prev_ftran = NULL;
434 add_to_linked_list((struct list_element *)first_ftran,
435 (struct list_element *)f);
441 f->owner = (struct conn * const)c;
456 * Destroy a control connection, remove it from the linked
457 * list, and clean up after it.
459 void destroy_conn(struct conn * const c)
461 if (c == NULL) return;
464 destroy_ftran(c->transfer);
465 remove_from_linked_list((struct list_element *)c);
470 * Destroy a data connection, remove it from the linked list,
471 * and clean up after it.
473 * For some reason, TCP_CORK (Linux 2.2.x-only) doesn't flush
474 * even _after_ the socket is closed, so we zero it just before
475 * closing. We also zero just before sending the last packet,
476 * as it seems to be needed on some systems.
478 * If you wonder why I check for `defined(SOL_TCP)' and don't
479 * provide an alternative, see the comments on init_file_transfer().
481 void destroy_ftran(struct ftran * const f)
483 const unsigned int zero = 0;
485 if (f == NULL) return;
486 #if defined(TCP_CORK) && defined(SOL_TCP)
487 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
493 time(&(f->dir_cache->last_used));
494 f->dir_cache->use_count--;
500 if (f->dir_listing) {
504 munmap(f->file_data, f->size);
510 if (f->local_file != -1) close(f->local_file);
513 if (f->dir_listing) unlink(f->filename);
516 f->owner->transfer = NULL;
519 if (f->dir_cache != NULL) f->dir_cache->use_count--;
522 remove_from_linked_list((struct list_element *)f);
528 * Destroy a directory listing cache entry, remove it from the
529 * linked list, and clean up after it.
531 * If you free a cache entry that is in use (use_count > 0),
532 * BetaFTPD will most likely crash (later). The thing you're supposed
533 * to do when you're done with a dcache entry, is to decrement
534 * its use_count, and let the timeout functions do the destroying
535 * when it's time to do so.
537 void destroy_dcache(struct dcache * const d)
539 if (d == NULL) return;
541 if (d->dir_data != NULL) free(d->dir_data);
542 remove_from_linked_list((struct list_element *)d);
547 * process_all_clients():
548 * Processes all the _control_ connections in active_clients
549 * (normally returned from a select(), there are at max
550 * NUM_AC active connections in the set), sending them
551 * through to the command parser if a command has been
555 int process_all_clients(const int num_ac)
557 int process_all_clients(const fd_set * const active_clients, const int num_ac)
560 struct conn *c = NULL, *next = first_conn->next_conn;
561 int checked_through = 0;
563 /* run through the linked list */
564 while (next != NULL && checked_through < num_ac) {
570 if ((fds[c->sock].revents & (POLLIN|POLLERR|POLLHUP|POLLNVAL)) == 0) {
574 if (!FD_ISSET(c->sock, active_clients)) {
581 bytes_avail = recv(c->sock, c->recv_buf + c->buf_len,
582 255 - c->buf_len, 0);
583 if (bytes_avail <= 0) {
585 * select() has already told us there's something about
586 * this socket, so if we get a return value of zero, the
587 * client has closed the socket. If we get a return value
588 * of -1 (error), we close the socket ourselves.
590 * We do the same for poll(), even though we actually have
591 * bits that tell us what is happening (in case of new
592 * input AND error/hangup at the same time, we do an
593 * explicit check at the bottom of the loop as well).
599 /* overrun = disconnect */
600 if (c->buf_len + bytes_avail > 254) {
601 numeric(c, 503, "Buffer overrun; disconnecting.");
606 c->buf_len += bytes_avail;
609 if (fds[c->sock].revents & (POLLERR|POLLHUP|POLLNVAL)) {
613 return checked_through;
617 * process_all_sendfiles():
618 * Sends data to all clients that are ready to receive it.
619 * Also checks for data connections that are newly-connected,
620 * and handler xferlog entries for the files that are finished.
623 int process_all_sendfiles(const int num_ac)
625 int process_all_sendfiles(fd_set * const active_clients, const int num_ac)
628 struct ftran *f = NULL, *next = first_ftran->next_ftran;
629 int checked_through = 0;
630 struct sockaddr tempaddr;
631 int tempaddr_len = sizeof(tempaddr);
633 while (next != NULL && checked_through < num_ac) {
635 next = f->next_ftran;
638 if (fds[f->sock].revents & (POLLHUP|POLLERR|POLLNVAL)) {
644 /* state = 2: incoming PASV, state >3: send file */
646 if ((f->state < 2) || (f->state == 3) || (fds[f->sock].revents & (POLLIN|POLLOUT)) == 0) {
648 if ((f->state < 2) || (f->state == 3) || !FD_ISSET(f->sock, active_clients)) {
656 /* Nothing is needed for the poll() version? */
658 FD_CLR(f->sock, active_clients);
661 if (f->state == 2) { /* incoming PASV */
662 const unsigned int one = 1;
663 const int tempsock = accept(f->sock, (struct sockaddr *)&tempaddr,
668 if (tempsock == -1) {
674 ioctl(f->sock, FIONBIO, &one);
675 init_file_transfer(f);
677 if (f->upload) continue;
681 init_file_transfer(f);
683 if (f->upload) continue;
687 /* for download, we send the first packets right away */
690 if (do_upload(f)) continue;
693 if (do_download(f)) continue;
695 /* do_{upload,download} returned 0, the transfer is complete */
696 numeric(f->owner, 226, "Transfer complete.");
697 time(&(f->owner->last_transfer));
700 if (!f->dir_listing) {
707 update_display(first_conn);
711 return checked_through;
715 int do_upload(struct ftran *f)
717 char upload_buf[16384];
720 /* keep buffer size small in ascii transfers
721 to prevent process stalling while filtering
722 data on slower computers */
725 * This isn't a big problem, since we won't get
726 * packets this big anyway, the biggest I've seen
727 * was 12kB on 100mbit (but that was from a Windows
728 * machine), so I've reduced the buffer from 64 kB
729 * to 16 kB :-) --Steinar
731 const int maxlen = (f->ascii_mode == 1) ? 4096 : 16384;
733 const int maxlen = 16384;
737 size = recv(f->sock, upload_buf, maxlen, 0);
742 if (size > 0 && f->ascii_mode == 1) {
743 size = ascii_uploadfilter(upload_buf, size);
746 if (size > 0 && (write(f->local_file, upload_buf, size) == size)) {
748 } else if (size == -1) {
749 /* don't write xferlog... or? */
750 numeric(f->owner, 426, strerror(errno));
758 int do_download(struct ftran *f)
760 #if defined(TCP_CORK) && defined(SOL_TCP)
761 unsigned int zero = 0;
765 int more_to_send = 0;
768 char buf[MAX_BLOCK_SIZE];
771 char buf2[MAX_BLOCK_SIZE * 2];
775 #if HAVE_LINUX_SENDFILE
777 * We handle the optimal case first, which is sendfile().
778 * Here we use a rather simplified sending `algorithm',
779 * leaving most of the quirks to the system calls.
781 if (sendfile_supported == 1 && f->dir_listing == 0) {
783 size = f->size - f->pos;
785 if (size > f->block_size) size = f->block_size;
786 if (size < 0) size = 0;
789 if (size != f->block_size) {
790 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
794 err = sendfile(f->sock, f->local_file, &f->pos, size);
795 return (f->pos < f->size) && (err > -1);
800 size = f->size - f->pos;
802 if (size > f->block_size) size = f->block_size;
803 if (size < 0) size = 0;
805 bytes_to_send = size;
806 sendfrom_buf = f->file_data + f->pos;
808 bytes_to_send = read(f->local_file, buf, f->block_size);
812 if (bytes_to_send == f->block_size) more_to_send = 1;
815 if (f->ascii_mode == 1) {
816 bytes_to_send = ascii_downloadfilter(sendfrom_buf,
817 buf2, bytes_to_send);
820 #endif /* WANT_ASCII */
822 #if defined(TCP_CORK) && defined(SOL_TCP)
823 /* if we believe this is the last packet, unset TCP_CORK */
824 if (more_to_send == 0) {
825 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
829 size = send(f->sock, sendfrom_buf, bytes_to_send, 0);
830 if (size < bytes_to_send) more_to_send = 1;
833 if (f->ascii_mode == 1 && size < bytes_to_send && size > 0) {
834 size = ascii_findlength(sendfrom_buf, size);
839 if (size > 0) f->pos += size;
846 void write_xferlog(struct ftran *f)
849 time_t now = time(NULL);
850 struct tm *t = localtime(&now);
852 if (xferlog == NULL) return;
854 strftime(temp, 256, "%a %b %d %H:%M:%S %Y", t);
856 fprintf(xferlog, "%s %u %s %lu %s b _ %c a %s ftp 0 * \n",
858 fprintf(xferlog, "%s %u %s %lu %s b _ o a %s ftp 0 *\n",
860 temp, (int)(difftime(now, f->tran_start)),
861 inet_ntoa(f->sin.sin_addr), f->size,
864 (f->upload) ? 'i' : 'o',
870 /* vim needs this to work properly :-( */
877 /* Reallocate the buggers constantly */
880 struct conn *c = first_conn;
881 int maxloops = MAXCLIENTS;
883 while (c && c->next_conn) {
884 struct conn *temp = malloc(sizeof(*temp));
886 *temp = *(c->next_conn);
887 if (temp->transfer) temp->transfer->owner = temp;
888 memset(c->next_conn, 0, sizeof(struct conn));
894 assert(maxloops > 0);
900 * main(): Main function. Does the initialization, and contains
901 * the main server loop. Takes no command-line arguments
902 * (see README for justification).
909 /* the sets are declared globally if we use poll() */
911 fd_set fds, fds_send;
914 /*setlinebuf(stdout);*/
915 setvbuf(stdout, (char *)NULL, _IOLBF, 0);
917 signal(SIGPIPE, SIG_IGN);
919 printf("BetaFTPD version %s, Copyright (C) 1999-2000 Steinar H. Gunderson\n", VERSION);
920 puts("BetaFTPD comes with ABSOLUTELY NO WARRANTY; for details see the file");
921 puts("COPYING. This is free software, and you are welcome to redistribute it");
922 puts("under certain conditions; again see the file COPYING for details.");
925 /* we don't need stdin */
931 for (i = 0; i < FD_MAX; i++) {
937 FD_ZERO(&master_fds);
938 FD_ZERO(&master_send_fds);
941 server_sock = create_server_socket();
944 printf("%cc", (char)27); /* reset and clear the screen */
947 /* init dummy first connection */
948 first_conn = alloc_new_conn(-1);
949 first_ftran = alloc_new_ftran(0, NULL);
951 first_dcache = alloc_new_dcache();
956 #warning No xferlog support for nonroot yet
959 xferlog = fopen("/var/log/xferlog", "r+");
960 if (xferlog == NULL) xferlog = fopen("/usr/adm/xferlog", "r+");
962 if (xferlog != NULL) {
963 fseek(xferlog, 0L, SEEK_END);
972 puts("fork() failed, exiting");
977 puts("BetaFTPD forked into the background");
981 puts("BetaFTPD active");
984 /* set timeout alarm here (after the fork) */
986 signal(SIGALRM, handle_alarm);
988 #if HAVE_LINUX_SENDFILE
989 /* check that sendfile() is really implemented (same check as configure does) */
991 int out_fd = 1, in_fd = 0;
996 sendfile(out_fd, in_fd, &offset, size);
997 if (errno == ENOSYS) sendfile_supported = 0;
1004 struct timeval timeout;
1007 /*screw_clients(); //look for memory errors */
1010 update_display(first_conn);
1014 i = poll(fds, highest_fds + 1, 60000);
1018 for (j=0; j<=highest_fds; j++) {
1019 if (fds[j].revents) printf("fds[%d].fd %d, .revents %x\n", j, fds[j].fd, fds[j].revents);
1024 /* reset fds (gets changed by select()) */
1026 fds_send = master_send_fds;
1029 * wait up to 60 secs for any activity
1031 timeout.tv_sec = 60;
1032 timeout.tv_usec = 0;
1034 i = select(FD_SETSIZE, &fds, &fds_send, NULL, &timeout);
1038 if (errno == EBADF) {
1040 /* don't like this, but we have to */
1041 clear_bad_fds(&server_sock);
1043 } else if (errno != EINTR) {
1054 /* fix an invalid server socket */
1055 if (fds[server_sock].revents & POLLERR) {
1056 del_fd(server_sock);
1057 server_sock = create_server_socket();
1061 /* remove any timed out sockets */
1062 if (time_to_check) {
1070 if (i <= 0) continue;
1073 i -= process_all_sendfiles(i);
1074 process_all_clients(i);
1076 /* sends are given highest `priority' */
1077 i -= process_all_sendfiles(&fds_send, i);
1079 /* incoming PASV connections and uploads */
1080 i -= process_all_sendfiles(&fds, i);
1083 * check the incoming PASV connections first, so
1084 * process_all_clients() won't be confused.
1086 process_all_clients(&fds, i);
1090 if (fds[server_sock].revents & POLLIN) {
1092 if (FD_ISSET(server_sock, &fds)) {
1094 accept_new_client(&server_sock);
1101 * accept_new_client():
1102 * Open a socket for the new client, say hello and put it in
1105 void accept_new_client(int * const server_sock)
1107 struct sockaddr_in tempaddr;
1108 int tempaddr_len = sizeof(tempaddr);
1109 const int tempsock = accept(*server_sock, (struct sockaddr *)&tempaddr, &tempaddr_len);
1111 static int num_err = 0;
1118 if ((errno == EBADF || errno == EPIPE) && ++num_err >= 3) {
1119 del_fd(*server_sock);
1120 *server_sock = create_server_socket();
1123 struct conn * const c = alloc_new_conn(tempsock);
1126 numeric(c, 220, "BetaFTPD " VERSION " ready.");
1128 memcpy(&(c->addr), &tempaddr, sizeof(struct sockaddr));
1135 * time_out_sockets():
1136 * Times out any socket that has not had any transfer
1137 * in the last 15 minutes (delay not customizable by FTP
1138 * user -- you must change it in ftpd.h).
1140 * Note that RFC959 explicitly states that there are no
1141 * `spontaneous' error replies, yet we have to do it to
1142 * get the message through at all.
1144 * If we check this list for every accept() call, it's
1145 * actually eating a lot of CPU time, so we only check
1146 * it every minute. We used to do a time() call here,
1147 * but we've changed to do use an alarm() call and set
1148 * the time_to_check_flag in the SIGALRM handler.
1150 RETSIGTYPE handle_alarm(int signum)
1156 signal(SIGALRM, handle_alarm);
1159 void time_out_sockets()
1161 struct conn *c = NULL, *next = first_conn->next_conn;
1162 time_t now = time(NULL);
1164 /* run through the linked list */
1165 while (next != NULL) {
1167 next = c->next_conn;
1169 if ((c->transfer == NULL || c->transfer->state != 5) &&
1170 (now - c->last_transfer > TIMEOUT_SECS)) {
1171 /* RFC violation? */
1172 numeric(c, 421, "Timeout (%u minutes): Closing control connection.", TIMEOUT_SECS/60);
1180 * Remove some bytes from the incoming buffer. This gives
1181 * room for new data on the control connection, and should
1182 * be called when the code has finished using the data.
1183 * (This is done automatically for all commands, so you
1184 * normally need not worry about it.)
1186 void remove_bytes(struct conn * const c, const int num)
1188 if (c->buf_len <= num) {
1192 memmove(c->recv_buf, c->recv_buf + num, c->buf_len);
1197 * numeric(): Sends a numeric FTP reply to the client. Note that
1198 * you can use this command much the same way as you
1199 * would use a printf() (with all the normal %s, %d,
1200 * etc.), since it actually uses printf() internally.
1202 void numeric(struct conn * const c, const int numeric, const char * const format, ...)
1204 char buf[256], fmt[256];
1208 snprintf(fmt, 256, "%03u %s\r\n", numeric, format);
1210 va_start(args, format);
1211 i = vsnprintf(buf, 256, fmt, args);
1214 err = send(c->sock, buf, i, 0);
1215 if (err == -1 && errno == EPIPE) {
1221 * init_file_transfer():
1222 * Initiate a data connection for sending. This does not open
1223 * any files etc., just does whatever is needed for the socket,
1224 * if needed. It does, however, send the 150 reply to the client,
1225 * and mmap()s if needed.
1227 * Linux systems (others?) define SOL_TCP right away, which saves us
1228 * some grief and code size. Perhaps using getprotoent() is the `right'
1229 * way, but it's bigger :-) (Optionally, we could figure it out at
1230 * configure time, of course...)
1232 * For optimal speed, we use the Linux 2.2.x-only TCP_CORK flag if
1233 * possible. Note that this is only defined in the first `arm' --
1234 * we silently assume that Linux is the only OS supporting this
1235 * flag. This might be an over-generalization, but I it looks like
1236 * we'll have to depend on it other places as well, so we might
1237 * just as well be evil here.
1239 void init_file_transfer(struct ftran * const f)
1242 struct conn * const c = f->owner;
1243 const int mode = IPTOS_THROUGHPUT, zero = 0, one = 1;
1248 /* we want max throughput */
1249 setsockopt(f->sock, SOL_IP, IP_TOS, (void *)&mode, sizeof(mode));
1250 setsockopt(f->sock, SOL_TCP, TCP_NODELAY, (void *)&zero, sizeof(zero));
1252 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&one, sizeof(one));
1255 /* should these pointers be freed afterwards? */
1257 getprotoent(); /* legal? */
1259 const struct protoent * const pe_ip = getprotobyname("ip");
1260 const struct protoent * const pe_tcp = getprotobyname("tcp");
1261 setsockopt(f->sock, pe_ip->p_proto, IP_TOS, (void *)&mode, sizeof(mode));
1262 setsockopt(f->sock, pe_tcp->p_proto, TCP_NODELAY, (void *)&zero, sizeof(zero));
1268 if (f->dir_listing) {
1269 f->block_size = MAX_BLOCK_SIZE;
1272 f->ascii_mode = f->owner->ascii_mode;
1275 /* find the preferred block size */
1276 f->block_size = MAX_BLOCK_SIZE;
1277 if (fstat(f->local_file, &buf) != -1 &&
1278 buf.st_blksize < MAX_BLOCK_SIZE) {
1279 f->block_size = buf.st_blksize;
1290 #endif /* WANT_UPLOAD */
1292 TRAP_ERROR(add_fd(f->sock, events), 500, return);
1296 setsockopt(f->sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
1298 #if !HAVE_POLL && WANT_UPLOAD
1300 * if we let an upload socket stay in master_send_fds, we would
1301 * get data that would fool us into closing the socket... (sigh)
1304 FD_CLR(f->sock, &master_send_fds);
1305 FD_SET(f->sock, &master_fds);
1309 time(&(f->owner->last_transfer));
1311 if (f->dir_listing) {
1313 numeric(f->owner, 150, "Opening ASCII mode data connection for directory listing.");
1316 * slightly kludged -- perhaps we should kill the second arm,
1317 * at the expense of code size? Or perhaps we could collapse
1318 * the two possible replies into one?
1324 #endif /* WANT_UPLOAD */
1326 numeric(f->owner, 150, "Opening %s mode data connection for '%s'",
1327 (f->ascii_mode) ? "ASCII" : "BINARY", f->filename);
1329 numeric(f->owner, 150, "Opening %s mode data connection for '%s' (%u bytes)",
1330 (f->ascii_mode) ? "ASCII" : "BINARY", f->filename,
1333 #else /* !WANT_ASCII */
1336 numeric(f->owner, 150, "Opening BINARY mode data connection for '%s'", f->filename);
1338 #endif /* WANT_UPLOAD */
1339 numeric(f->owner, 150, "Opening BINARY mode data connection for '%s' (%u bytes)", f->filename, f->size);
1340 #endif /* !WANT_ASCII */
1344 * This section _could_ in theory be more optimized, but it's
1345 * much easier this way, and hopefully, the compiler will be
1346 * intelligent enough to optimize most of this away. The idea
1347 * is, some modes _require_ use of mmap (or not). The preferred
1348 * thing is using mmap() when we don't have sendfile(), and not
1349 * using mmap() when we have sendfile().
1352 if (f->dir_listing == 0) {
1353 #if HAVE_LINUX_SENDFILE
1354 int do_mmap = (sendfile_supported) ? 0 : 1;
1359 if (f->ascii_mode == 1) do_mmap = 1;
1362 if (f->upload == 1) do_mmap = 0;
1366 f->file_data = mmap(NULL, f->size, PROT_READ, MAP_SHARED, f->local_file, 0);
1367 if (f->file_data == MAP_FAILED) f->file_data = NULL;
1369 f->file_data = NULL;
1371 f->pos = f->owner->rest_pos;
1373 #else /* !HAVE_MMAP */
1374 lseek(f->local_file, f->owner->rest_pos, SEEK_SET);
1379 * create_server_socket():
1380 * Create and bind a server socket, that we can use to
1381 * listen to new clients on.
1383 int create_server_socket()
1385 int server_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1386 const unsigned int one = 1;
1387 struct sockaddr_in addr;
1391 * In the `perfect' world, if an address was in use, we could
1392 * just wait for the kernel to clear everything up, and everybody
1393 * would be happy. But when you just found out your server socket
1394 * was invalid, it has to be `re-made', and 3000 users are trying
1395 * to access your fileserver, I think it's nice that it comes
1396 * up right away... hence this option.
1398 setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
1399 ioctl(server_sock, FIONBIO, &one); /* just in case */
1401 addr.sin_family = AF_INET;
1402 addr.sin_addr.s_addr = INADDR_ANY;
1403 addr.sin_port = htons(FTP_PORT);
1406 err = bind(server_sock, (struct sockaddr *)&addr, sizeof(struct sockaddr));
1411 /* try to recover from recoverable errors... */
1412 if (errno == ENOMEM || errno == EADDRINUSE) {
1413 puts("Waiting 1 sec before trying again...");
1420 } while (err == -1);
1422 listen(server_sock, 20);
1424 err = add_fd(server_sock, POLLIN);
1436 * Try to find invalid socket descriptors, and clean them.
1437 * The methods used are rather UGLY, but I can't think of
1438 * any good way of checking e.g. server_sock without
1439 * doing anything to it :-(
1441 * poll() is able to do this in a much cleaner way, which
1442 * we use if we use poll(). That checking isn't done here,
1445 void clear_bad_fds(int * const server_sock)
1449 struct timeval tv = { 0, 0 };
1452 FD_SET(*server_sock, &fds);
1453 if (select(*server_sock, &fds, NULL, NULL, &tv) == -1) {
1454 FD_CLR(*server_sock, &master_fds);
1455 close(*server_sock);
1456 *server_sock = create_server_socket();
1460 /* could do this (conn, ftran) in any order */
1462 struct conn *c = NULL, *next = first_conn->next_conn;
1464 /* run through the linked list */
1465 while (next != NULL) {
1469 next = c->next_conn;
1471 if (read(c->sock, &buf, 0) == -1 &&
1479 struct ftran *f = NULL, *next = first_ftran->next_ftran;
1481 while (next != NULL) {
1485 next = f->next_ftran;
1487 if (read(f->sock, &buf, 0) == -1 &&
1498 * dump_file(): Dumps a file on the control connection. Used for
1499 * welcome messages and the likes. Note that outbuf
1500 * is so big, to prevent any crashing from users creating
1501 * weird .message files (like 1024 LFs)... The size of
1502 * the file is limited to 1024 bytes (by truncation).
1504 void dump_file(struct conn * const c, const int num, const char * const filename)
1506 char buf[1024], outbuf[5121];
1507 char *ptr = outbuf + 4;
1510 const int dumpfile = open(filename, O_RDONLY);
1511 if (dumpfile == -1) return;
1513 i = read(dumpfile, buf, 1024);
1519 sprintf(outbuf, "%03u-", num);
1522 if (buf[j] == '\n') {
1523 sprintf(ptr, "%03u-", num);
1529 send(c->sock, outbuf, ptr - outbuf, 0);
1536 * Lists all README file in the current (ie. OS current)
1537 * directory, in a 250- message.
1539 void list_readmes(struct conn * const c)
1542 const time_t now = time(NULL);
1545 if (glob("README*", 0, NULL, &pglob) != 0) return;
1547 for (i = 0; i < pglob.gl_pathc; i++) {
1552 if (stat(pglob.gl_pathv[i], &buf) == -1) continue;
1554 /* remove trailing LF */
1555 tm = ctime(&buf.st_mtime);
1556 tm[strlen(tm) - 1] = 0;
1558 snprintf(str, 256, "250-Please read the file %s\r\n"
1559 "250-\tIt was last modified %s - %ld days ago\r\n",
1560 pglob.gl_pathv[i], tm,
1561 (now - buf.st_mtime) / 86400);
1562 send(c->sock, str, strlen(str), 0);