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__)
174 /* Debug printing -- remove before 0.0.8 final */
178 #define DPRINT(s) printf s
182 #define MAP_FAILED -1
185 struct conn *first_conn = NULL;
186 struct ftran *first_ftran = NULL;
188 struct dcache *first_dcache = NULL;
192 unsigned int highest_fds = 0;
196 struct pollfd fds[FD_MAX];
198 #define MAXCLIENTS FD_MAX
200 fd_set master_fds, master_send_fds;
201 #define MAXCLIENTS FD_SETSIZE
205 FILE *xferlog = NULL;
209 * This variable specifies if it's soon time to check for timed out
210 * clients, and timed out directory listing cache entries. It is
211 * set to 1 by a signal handler every minute, and set to 0 when the
212 * checking has been performed.
214 int time_to_check = 1;
218 * snprintf(): snprintf() replacement for systems that miss it. Note
219 * that this implementation does _not_ necessarily protect
220 * against all buffer overflows. Get a real snprintf() in
221 * your C library. That being said, the 8k limit is
222 * substantially larger than any other string in BetaFTPD,
223 * which should make such an attack harder.
225 int snprintf(char *str, size_t n, const char *format, ...)
231 va_start(args, format);
232 err = vsprintf(buf, format, args);
242 #ifndef HAVE_VSNPRINTF
244 * vsnprintf: vsnprintf() replacement for systems that miss it. Please
245 * see snprintf (above) for more information.
247 int vsnprintf(char *str, size_t n, const char *format, va_list ap)
252 err = vsprintf(buf, format, ap);
260 * add_fd(): Add an fd to the set we monitor. Return 0 on success.
261 * This code is shared between poll() and select() versions.
263 int add_fd(const int fd, const int events)
265 DPRINT(("add_fd(%d, %x)\n", fd, events));
268 printf("add_fd(%d, %x): failed\n", fd, events);
273 fds[fd].events = events;
274 if (highest_fds < fd)
277 if (fd >= FD_SETSIZE)
280 FD_SET(fd, &master_fds);
281 if (events & POLLOUT)
282 FD_SET(fd, &master_send_fds);
288 * del_fd(): Close and remove an fd from the set(s) we monitor. (See also add_fd().)
290 void del_fd(const int fd)
292 DPRINT(("del_fd(%d)\n", fd));
300 /* Reduce poll()'s workload by not making it watch past end of array */
301 while ((highest_fds > 0) && (fds[highest_fds].fd == -1))
304 if (fd >= FD_SETSIZE)
306 FD_CLR(fd, &master_fds);
307 FD_CLR(fd, &master_send_fds);
316 struct conn *c = first_conn;
317 printf("list_clients:\n");
318 while (c && c->next_conn) {
320 printf("list_clients: fd %d\n", c->sock);
326 * add_to_linked_list():
327 * Inserts an element (conn, ftran or dcache) into its linked list.
328 * The list is placed at the beginning, right after the (bogus)
329 * first element of the list.
331 void add_to_linked_list(struct list_element * const first,
332 struct list_element * const elem)
337 elem->next = first->next;
338 if (elem->next) elem->next->prev = elem;
341 /* this is the bogus head of the list */
347 * remove_from_linked_list():
348 * Removes an element (conn, ftran or dcache) from its linked list,
351 void remove_from_linked_list(struct list_element * const elem)
353 if (elem->prev != NULL) elem->prev->next = elem->next;
354 if (elem->next != NULL) elem->next->prev = elem->prev;
360 * Allocates a new control connection (type `struct conn'),
361 * initializes it, and adds it to the linked list. The connection
362 * operates on the socket SOCK.
364 struct conn *alloc_new_conn(const int sock)
366 const unsigned int one = 1;
367 struct conn *c = (struct conn *)(malloc(sizeof(struct conn)));
368 DPRINT(("alloc_new_conn(%d)\n", sock));
370 if (c == NULL) return c;
373 ioctl(sock, FIONBIO, &one);
374 if (add_fd(sock, POLLIN) != 0) {
376 send(sock, "230 Server too busy, please try again later.\r\n", 46, 0);
381 add_to_linked_list((struct list_element *)first_conn,
382 (struct list_element *)c);
384 /* this is the bogus head of the list */
391 c->buf_len = c->auth = c->rest_pos = 0;
398 * strcpy(c->curr_dir, "/");
399 * strcpy(c->last_cmd, "");
400 * strcpy(c->rename_from, "")
402 c->curr_dir[0] = '/';
404 c->curr_dir[1] = c->last_cmd[0] = c->rename_from[0] = '\0';
406 c->curr_dir[1] = c->rename_from[0] = '\0';
409 time(&(c->last_transfer));
418 * Allocates a new data connection (type `struct ftran'), and
419 * adds it to the linked list. The connection operates on the
420 * socket SOCK, and has the control connection C as its parent.
422 struct ftran *alloc_new_ftran(const int sock, const struct conn * const c)
424 struct ftran *f = (struct ftran *)(malloc(sizeof(struct ftran)));
426 if (f == NULL) return f;
428 /* this is the bogus head of the list */
429 f->next_ftran = NULL;
430 f->prev_ftran = NULL;
432 add_to_linked_list((struct list_element *)first_ftran,
433 (struct list_element *)f);
439 f->owner = (struct conn * const)c;
454 * alloc_new_dcache():
455 * Allocates a new directory cache entry (type `struct dcache'),
456 * and adds it to the linked list.
458 struct dcache *alloc_new_dcache()
460 struct dcache *d = (struct dcache *)(malloc(sizeof(struct dcache)));
462 if (d == NULL) return d;
466 strcpy(d->dir_name, "");
469 add_to_linked_list((struct list_element *)first_dcache,
470 (struct list_element *)d);
478 * Destroy a control connection, remove it from the linked
479 * list, and clean up after it.
481 void destroy_conn(struct conn * const c)
483 DPRINT(("destroy_conn:\n"));
484 if (c == NULL) return;
487 destroy_ftran(c->transfer);
488 remove_from_linked_list((struct list_element *)c);
490 DPRINT(("destroy_conn done.\n"));
495 * Destroy a data connection, remove it from the linked list,
496 * and clean up after it.
498 * For some reason, TCP_CORK (Linux 2.2.x-only) doesn't flush
499 * even _after_ the socket is closed, so we zero it just before
500 * closing. We also zero just before sending the last packet,
501 * as it seems to be needed on some systems.
503 * If you wonder why I check for `defined(SOL_TCP)' and don't
504 * provide an alternative, see the comments on init_file_transfer().
506 void destroy_ftran(struct ftran * const f)
508 const unsigned int zero = 0;
510 if (f == NULL) return;
511 #if defined(TCP_CORK) && defined(SOL_TCP)
512 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
518 time(&(f->dir_cache->last_used));
519 f->dir_cache->use_count--;
525 if (f->dir_listing) {
529 munmap(f->file_data, f->size);
535 if (f->local_file != -1) close(f->local_file);
538 if (f->dir_listing) unlink(f->filename);
541 f->owner->transfer = NULL;
544 if (f->dir_cache != NULL) f->dir_cache->use_count--;
547 remove_from_linked_list((struct list_element *)f);
553 * Destroy a directory listing cache entry, remove it from the
554 * linked list, and clean up after it.
556 * If you free a cache entry that is in use (use_count > 0),
557 * BetaFTPD will most likely crash (later). The thing you're supposed
558 * to do when you're done with a dcache entry, is to decrement
559 * its use_count, and let the timeout functions do the destroying
560 * when it's time to do so.
562 void destroy_dcache(struct dcache * const d)
564 if (d == NULL) return;
566 if (d->dir_data != NULL) free(d->dir_data);
567 remove_from_linked_list((struct list_element *)d);
572 * process_all_clients():
573 * Processes all the control connections in active_clients
574 * (normally returned from a select(), there are at max
575 * NUM_AC active connections in the set), sending them
576 * through to the command parser if a command has been
580 int process_all_clients(const int num_ac)
582 int process_all_clients(const fd_set * const active_clients, const int num_ac)
585 struct conn *c = NULL, *next = first_conn->next_conn;
586 int checked_through = 0;
588 DPRINT(("process_all_clients: num_ac %d\n", num_ac));
590 /* run through the linked list */
591 while (next != NULL && checked_through < num_ac) {
597 if (fds[c->sock].revents & (POLLERR|POLLHUP|POLLNVAL)) {
601 if (!fds[c->sock].revents & POLLIN) {
604 DPRINT(("process_all_clients: fd %d has POLLIN set\n", c->sock));
606 if (!FD_ISSET(c->sock, active_clients)) {
613 bytes_avail = recv(c->sock, c->recv_buf + c->buf_len,
614 255 - c->buf_len, 0);
615 if (bytes_avail <= 0) {
617 * select() has already told us there's something about
618 * this socket, so if we get a return value of zero, the
619 * client has closed the socket. If we get a return value
620 * of -1 (error), we close the socket ourselves.
622 * Just to be safe, we include this code for poll() as
629 /* overrun = disconnect */
630 if (c->buf_len + bytes_avail > 254) {
631 numeric(c, 503, "Buffer overrun; disconnecting.");
636 c->buf_len += bytes_avail;
639 return checked_through;
643 * process_all_sendfiles():
644 * Sends data to all clients that are ready to receive it.
645 * Also checks for data connections that are newly-connected,
646 * and handler xferlog entries for the files that are finished.
649 int process_all_sendfiles(const int num_ac)
651 int process_all_sendfiles(fd_set * const active_clients, const int num_ac)
654 struct ftran *f = NULL, *next = first_ftran->next_ftran;
655 int checked_through = 0;
656 struct sockaddr tempaddr;
657 int tempaddr_len = sizeof(tempaddr);
659 while (next != NULL && checked_through < num_ac) {
661 next = f->next_ftran;
664 if (fds[f->sock].revents & (POLLHUP|POLLERR|POLLNVAL)) {
670 /* state = 2: incoming PASV, state >3: send file */
672 if ((f->state < 2) || (f->state == 3) || (fds[f->sock].revents & (POLLIN|POLLOUT)) == 0) {
674 if ((f->state < 2) || (f->state == 3) || !FD_ISSET(f->sock, active_clients)) {
682 /* Nothing is needed for the poll() version? */
684 FD_CLR(f->sock, active_clients);
687 if (f->state == 2) { /* incoming PASV */
688 const unsigned int one = 1;
689 const int tempsock = accept(f->sock, (struct sockaddr *)&tempaddr,
694 if (tempsock == -1) {
700 ioctl(f->sock, FIONBIO, &one);
701 init_file_transfer(f);
703 if (f->upload) continue;
707 init_file_transfer(f);
709 if (f->upload) continue;
713 /* for download, we send the first packets right away */
716 if (do_upload(f)) continue;
719 if (do_download(f)) continue;
721 /* do_{upload,download} returned 0, the transfer is complete */
722 numeric(f->owner, 226, "Transfer complete.");
723 time(&(f->owner->last_transfer));
726 if (!f->dir_listing) {
733 update_display(first_conn);
737 return checked_through;
741 int do_upload(struct ftran *f)
743 char upload_buf[16384];
746 /* keep buffer size small in ascii transfers
747 to prevent process stalling while filtering
748 data on slower computers */
751 * This isn't a big problem, since we won't get
752 * packets this big anyway, the biggest I've seen
753 * was 12kB on 100mbit (but that was from a Windows
754 * machine), so I've reduced the buffer from 64 kB
755 * to 16 kB :-) --Steinar
757 const int maxlen = (f->ascii_mode == 1) ? 4096 : 16384;
759 const int maxlen = 16384;
763 size = recv(f->sock, upload_buf, maxlen, 0);
768 if (size > 0 && f->ascii_mode == 1) {
769 size = ascii_uploadfilter(upload_buf, size);
772 if (size > 0 && (write(f->local_file, upload_buf, size) == size)) {
774 } else if (size == -1) {
775 /* don't write xferlog... or? */
776 numeric(f->owner, 426, strerror(errno));
784 int do_download(struct ftran *f)
786 #if defined(TCP_CORK) && defined(SOL_TCP)
787 unsigned int zero = 0;
791 int more_to_send = 0;
794 char buf[MAX_BLOCK_SIZE];
797 char buf2[MAX_BLOCK_SIZE * 2];
801 #if HAVE_LINUX_SENDFILE
803 * We handle the optimal case first, which is sendfile().
804 * Here we use a rather simplified sending `algorithm',
805 * leaving most of the quirks to the system calls.
807 if (f->dir_listing == 0
813 size = f->size - f->pos;
815 if (size > f->block_size) size = f->block_size;
816 if (size < 0) size = 0;
819 if (size != f->block_size) {
820 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
824 err = sendfile(f->sock, f->local_file, &f->pos, size);
825 return (f->pos < f->size) && (err > -1);
830 size = f->size - f->pos;
832 if (size > f->block_size) size = f->block_size;
833 if (size < 0) size = 0;
835 bytes_to_send = size;
836 sendfrom_buf = f->file_data + f->pos;
838 bytes_to_send = read(f->local_file, buf, f->block_size);
842 if (bytes_to_send == f->block_size) more_to_send = 1;
845 if (f->ascii_mode == 1) {
846 bytes_to_send = ascii_downloadfilter(sendfrom_buf,
847 buf2, bytes_to_send);
850 #endif /* WANT_ASCII */
852 #if defined(TCP_CORK) && defined(SOL_TCP)
853 /* if we believe this is the last packet, unset TCP_CORK */
854 if (more_to_send == 0) {
855 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&zero, sizeof(zero));
859 size = send(f->sock, sendfrom_buf, bytes_to_send, 0);
860 if (size < bytes_to_send) more_to_send = 1;
863 if (f->ascii_mode == 1 && size < bytes_to_send && size > 0) {
864 size = ascii_findlength(sendfrom_buf, size);
869 if (size > 0) f->pos += size;
876 void write_xferlog(struct ftran *f)
879 time_t now = time(NULL);
880 struct tm *t = localtime(&now);
882 if (xferlog == NULL) return;
884 strftime(temp, 256, "%a %b %d %H:%M:%S %Y", t);
886 fprintf(xferlog, "%s %u %s %lu %s b _ %c a %s ftp 0 * \n",
888 fprintf(xferlog, "%s %u %s %lu %s b _ o a %s ftp 0 *\n",
890 temp, (int)(difftime(now, f->tran_start)),
891 inet_ntoa(f->sin.sin_addr), f->size,
894 (f->upload) ? 'i' : 'o',
900 /* vim needs this to work properly :-( */
907 /* Reallocate the buggers constantly */
910 struct conn *c = first_conn;
911 int maxloops = MAXCLIENTS;
913 while (c && c->next_conn) {
914 struct conn *temp = malloc(sizeof(*temp));
916 *temp = *(c->next_conn);
917 if (temp->transfer) temp->transfer->owner = temp;
918 memset(c->next_conn, 0, sizeof(struct conn));
924 assert(maxloops > 0);
930 * main(): Main function. Does the initialization, and contains
931 * the main server loop. Takes no command-line arguments
932 * (see README for justification).
939 /* the sets are declared globally if we use poll() */
941 fd_set fds, fds_send;
944 /*setlinebuf(stdout);*/
945 setvbuf(stdout, (char *)NULL, _IOLBF, 0);
947 signal(SIGPIPE, SIG_IGN);
949 printf("BetaFTPD version %s, Copyright (C) 1999-2000 Steinar H. Gunderson\n", VERSION);
950 puts("BetaFTPD comes with ABSOLUTELY NO WARRANTY; for details see the file");
951 puts("COPYING. This is free software, and you are welcome to redistribute it");
952 puts("under certain conditions; again see the file COPYING for details.");
955 /* we don't need stdin */
961 for (i = 0; i < FD_MAX; i++) {
967 FD_ZERO(&master_fds);
968 FD_ZERO(&master_send_fds);
971 server_sock = create_server_socket();
974 printf("%cc", (char)27); /* reset and clear the screen */
977 /* init dummy first connection */
978 first_conn = alloc_new_conn(-1);
979 first_ftran = alloc_new_ftran(0, NULL);
981 first_dcache = alloc_new_dcache();
986 #warning No xferlog support for nonroot yet
989 xferlog = fopen("/var/log/xferlog", "r+");
990 if (xferlog == NULL) xferlog = fopen("/usr/adm/xferlog", "r+");
992 if (xferlog != NULL) {
993 fseek(xferlog, 0L, SEEK_END);
1002 puts("fork() failed, exiting");
1007 puts("BetaFTPD forked into the background");
1011 puts("BetaFTPD active");
1014 /* set timeout alarm here (after the fork) */
1016 signal(SIGALRM, handle_alarm);
1021 struct timeval timeout;
1024 /*screw_clients(); //look for memory errors */
1027 update_display(first_conn);
1031 i = poll(fds, highest_fds + 1, 60000);
1032 DPRINT(("poll returns %d\n", i));
1036 for (j=0; j<=highest_fds; j++) {
1037 if (fds[j].revents) printf("fds[%d].fd %d, .revents %x\n", j, fds[j].fd, fds[j].revents);
1042 /* reset fds (gets changed by select()) */
1044 fds_send = master_send_fds;
1047 * wait up to 60 secs for any activity
1049 timeout.tv_sec = 60;
1050 timeout.tv_usec = 0;
1052 i = select(FD_SETSIZE, &fds, &fds_send, NULL, &timeout);
1056 if (errno == EBADF) {
1058 /* don't like this, but we have to */
1059 clear_bad_fds(&server_sock);
1061 } else if (errno != EINTR) {
1072 /* fix an invalid server socket */
1073 if (fds[server_sock].revents & POLLERR) {
1074 del_fd(server_sock);
1075 server_sock = create_server_socket();
1079 /* remove any timed out sockets */
1080 if (time_to_check) {
1088 if (i <= 0) continue;
1091 i -= process_all_sendfiles(i);
1092 process_all_clients(i);
1094 /* sends are given highest `priority' */
1095 i -= process_all_sendfiles(&fds_send, i);
1097 /* incoming PASV connections and uploads */
1098 i -= process_all_sendfiles(&fds, i);
1101 * check the incoming PASV connections first, so
1102 * process_all_clients() won't be confused.
1104 process_all_clients(&fds, i);
1108 if (fds[server_sock].revents & POLLIN) {
1110 if (FD_ISSET(server_sock, &fds)) {
1112 accept_new_client(&server_sock);
1119 * accept_new_client():
1120 * Open a socket for the new client, say hello and put it in
1123 void accept_new_client(int * const server_sock)
1125 struct sockaddr_in tempaddr;
1126 int tempaddr_len = sizeof(tempaddr);
1127 const int tempsock = accept(*server_sock, (struct sockaddr *)&tempaddr, &tempaddr_len);
1129 static int num_err = 0;
1136 if ((errno == EBADF || errno == EPIPE) && ++num_err >= 3) {
1137 del_fd(*server_sock);
1138 *server_sock = create_server_socket();
1141 struct conn * const c = alloc_new_conn(tempsock);
1144 numeric(c, 220, "BetaFTPD " VERSION " ready.");
1146 memcpy(&(c->addr), &tempaddr, sizeof(struct sockaddr));
1153 * time_out_sockets():
1154 * Times out any socket that has not had any transfer
1155 * in the last 15 minutes (delay not customizable by FTP
1156 * user -- you must change it in ftpd.h).
1158 * Note that RFC959 explicitly states that there are no
1159 * `spontaneous' error replies, yet we have to do it to
1160 * get the message through at all.
1162 * If we check this list for every accept() call, it's
1163 * actually eating a lot of CPU time, so we only check
1164 * it every minute. We used to do a time() call here,
1165 * but we've changed to do use an alarm() call and set
1166 * the time_to_check_flag in the SIGALRM handler.
1168 RETSIGTYPE handle_alarm(int signum)
1174 signal(SIGALRM, handle_alarm);
1177 void time_out_sockets()
1179 struct conn *c = NULL, *next = first_conn->next_conn;
1180 time_t now = time(NULL);
1182 /* run through the linked list */
1183 while (next != NULL) {
1185 next = c->next_conn;
1187 if ((c->transfer == NULL || c->transfer->state != 5) &&
1188 (now - c->last_transfer > TIMEOUT_SECS)) {
1189 /* RFC violation? */
1190 numeric(c, 421, "Timeout (%u minutes): Closing control connection.", TIMEOUT_SECS/60);
1198 * time_out_dcache():
1199 * Time out expired directory listing cache entries.
1200 * Uses much of the same code as time_out_sockets().
1202 void time_out_dcache()
1204 struct dcache *d = NULL, *next = first_dcache->next_dcache;
1205 time_t now = time(NULL);
1207 /* run through the linked list */
1208 while (next != NULL) {
1210 next = d->next_dcache;
1212 if (d->use_count == 0 && (now - d->last_used > 900)) {
1221 * Remove some bytes from the incoming buffer. This gives
1222 * room for new data on the control connection, and should
1223 * be called when the code has finished using the data.
1224 * (This is done automatically for all commands, so you
1225 * normally need not worry about it.)
1227 void remove_bytes(struct conn * const c, const int num)
1229 if (c->buf_len <= num) {
1233 memmove(c->recv_buf, c->recv_buf + num, c->buf_len);
1238 * numeric(): Sends a numeric FTP reply to the client. Note that
1239 * you can use this command much the same way as you
1240 * would use a printf() (with all the normal %s, %d,
1241 * etc.), since it actually uses printf() internally.
1243 void numeric(struct conn * const c, const int numeric, const char * const format, ...)
1245 char buf[256], fmt[256];
1249 snprintf(fmt, 256, "%03u %s\r\n", numeric, format);
1251 va_start(args, format);
1252 i = vsnprintf(buf, 256, fmt, args);
1256 err = send(c->sock, buf, i, 0);
1257 if (err == -1 && errno == EPIPE) {
1263 * init_file_transfer():
1264 * Initiate a data connection for sending. This does not open
1265 * any files etc., just does whatever is needed for the socket,
1266 * if needed. It does, however, send the 150 reply to the client,
1267 * and mmap()s if needed.
1269 * Linux systems (others?) define SOL_TCP right away, which saves us
1270 * some grief and code size. Perhaps using getprotoent() is the `right'
1271 * way, but it's bigger :-) (Optionally, we could figure it out at
1272 * configure time, of course...)
1274 * For optimal speed, we use the Linux 2.2.x-only TCP_CORK flag if
1275 * possible. Note that this is only defined in the first `arm' --
1276 * we silently assume that Linux is the only OS supporting this
1277 * flag. This might be an over-generalization, but I it looks like
1278 * we'll have to depend on it other places as well, so we might
1279 * just as well be evil here.
1281 void init_file_transfer(struct ftran * const f)
1284 struct conn * const c = f->owner;
1285 const int mode = IPTOS_THROUGHPUT, zero = 0, one = 1;
1290 /* we want max throughput */
1291 setsockopt(f->sock, SOL_IP, IP_TOS, (void *)&mode, sizeof(mode));
1292 setsockopt(f->sock, SOL_TCP, TCP_NODELAY, (void *)&zero, sizeof(zero));
1294 setsockopt(f->sock, SOL_TCP, TCP_CORK, (void *)&one, sizeof(one));
1297 /* should these pointers be freed afterwards? */
1299 getprotoent(); /* legal? */
1301 const struct protoent * const pe_ip = getprotobyname("ip");
1302 const struct protoent * const pe_tcp = getprotobyname("tcp");
1303 setsockopt(f->sock, pe_ip->p_proto, IP_TOS, (void *)&mode, sizeof(mode));
1304 setsockopt(f->sock, pe_tcp->p_proto, TCP_NODELAY, (void *)&zero, sizeof(zero));
1310 if (f->dir_listing) {
1311 f->block_size = MAX_BLOCK_SIZE;
1314 f->ascii_mode = f->owner->ascii_mode;
1317 /* find the preferred block size */
1318 f->block_size = MAX_BLOCK_SIZE;
1319 if (fstat(f->local_file, &buf) != -1 &&
1320 buf.st_blksize < MAX_BLOCK_SIZE) {
1321 f->block_size = buf.st_blksize;
1332 #endif /* WANT_UPLOAD */
1334 TRAP_ERROR(add_fd(f->sock, events), 500, return);
1338 setsockopt(f->sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
1340 #if !HAVE_POLL && WANT_UPLOAD
1342 * if we let an upload socket stay in master_send_fds, we would
1343 * get data that would fool us into closing the socket... (sigh)
1346 FD_CLR(f->sock, &master_send_fds);
1347 FD_SET(f->sock, &master_fds);
1351 time(&(f->owner->last_transfer));
1353 if (f->dir_listing) {
1355 numeric(f->owner, 150, "Opening ASCII mode data connection for directory listing.");
1358 * slightly kludged -- perhaps we should kill the second arm,
1359 * at the expense of code size? Or perhaps we could collapse
1360 * the two possible replies into one?
1366 #endif /* WANT_UPLOAD */
1368 numeric(f->owner, 150, "Opening %s mode data connection for '%s'",
1369 (f->ascii_mode) ? "ASCII" : "BINARY", f->filename);
1371 numeric(f->owner, 150, "Opening %s mode data connection for '%s' (%u bytes)",
1372 (f->ascii_mode) ? "ASCII" : "BINARY", f->filename,
1375 #else /* !WANT_ASCII */
1378 numeric(f->owner, 150, "Opening BINARY mode data connection for '%s'", f->filename);
1380 #endif /* WANT_UPLOAD */
1381 numeric(f->owner, 150, "Opening BINARY mode data connection for '%s' (%u bytes)", f->filename, f->size);
1382 #endif /* !WANT_ASCII */
1386 * This section _could_ in theory be more optimized, but it's
1387 * much easier this way, and hopefully, the compiler will be
1388 * intelligent enough to optimize most of this away. The idea
1389 * is, some modes _require_ use of mmap (or not). The preferred
1390 * thing is using mmap() when we don't have sendfile(), and not
1391 * using mmap() when we have sendfile().
1394 if (f->dir_listing == 0) {
1395 #if HAVE_LINUX_SENDFILE
1401 if (f->ascii_mode == 1) do_mmap = 1;
1404 if (f->upload == 1) do_mmap = 0;
1408 f->file_data = mmap(NULL, f->size, PROT_READ, MAP_SHARED, f->local_file, 0);
1409 if (f->file_data == MAP_FAILED) f->file_data = NULL;
1411 f->file_data = NULL;
1413 f->pos = f->owner->rest_pos;
1415 #else /* !HAVE_MMAP */
1416 lseek(f->local_file, f->owner->rest_pos, SEEK_SET);
1421 * create_server_socket():
1422 * Create and bind a server socket, that we can use to
1423 * listen to new clients on.
1425 int create_server_socket()
1427 int server_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1428 const unsigned int one = 1;
1429 struct sockaddr_in addr;
1433 * In the `perfect' world, if an address was in use, we could
1434 * just wait for the kernel to clear everything up, and everybody
1435 * would be happy. But when you just found out your server socket
1436 * was invalid, it has to be `re-made', and 3000 users are trying
1437 * to access your fileserver, I think it's nice that it comes
1438 * up right away... hence this option.
1440 setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
1441 ioctl(server_sock, FIONBIO, &one); /* just in case */
1443 addr.sin_family = AF_INET;
1444 addr.sin_addr.s_addr = INADDR_ANY;
1445 addr.sin_port = htons(FTP_PORT);
1448 err = bind(server_sock, (struct sockaddr *)&addr, sizeof(struct sockaddr));
1453 /* try to recover from recoverable errors... */
1454 if (errno == ENOMEM || errno == EADDRINUSE) {
1455 puts("Waiting 1 sec before trying again...");
1462 } while (err == -1);
1464 listen(server_sock, 20);
1466 err = add_fd(server_sock, POLLIN);
1478 * Try to find invalid socket descriptors, and clean them.
1479 * The methods used are rather UGLY, but I can't think of
1480 * any good way of checking e.g. server_sock without
1481 * doing anything to it :-(
1483 * poll() is able to do this in a much cleaner way, which
1484 * we use if we use poll(). That checking isn't done here,
1487 void clear_bad_fds(int * const server_sock)
1491 struct timeval tv = { 0, 0 };
1494 FD_SET(*server_sock, &fds);
1495 if (select(*server_sock, &fds, NULL, NULL, &tv) == -1) {
1496 FD_CLR(*server_sock, &master_fds);
1497 close(*server_sock);
1498 *server_sock = create_server_socket();
1502 /* could do this (conn, ftran) in any order */
1504 struct conn *c = NULL, *next = first_conn->next_conn;
1506 /* run through the linked list */
1507 while (next != NULL) {
1511 next = c->next_conn;
1513 if (read(c->sock, &buf, 0) == -1 &&
1521 struct ftran *f = NULL, *next = first_ftran->next_ftran;
1523 while (next != NULL) {
1527 next = f->next_ftran;
1529 if (read(f->sock, &buf, 0) == -1 &&
1540 * dump_file(): Dumps a file on the control connection. Used for
1541 * welcome messages and the likes. Note that outbuf
1542 * is so big, to prevent any crashing from users creating
1543 * weird .message files (like 1024 LFs)... The size of
1544 * the file is limited to 1024 bytes (by truncation).
1546 void dump_file(struct conn * const c, const int num, const char * const filename)
1548 char buf[1024], outbuf[5121];
1549 char *ptr = outbuf + 4;
1552 const int dumpfile = open(filename, O_RDONLY);
1553 if (dumpfile == -1) return;
1555 i = read(dumpfile, buf, 1024);
1561 sprintf(outbuf, "%03u-", num);
1564 if (buf[j] == '\n') {
1565 sprintf(ptr, "%03u-", num);
1571 send(c->sock, outbuf, ptr - outbuf, 0);
1578 * Lists all README file in the current (ie. OS current)
1579 * directory, in a 250- message.
1581 void list_readmes(struct conn * const c)
1584 const time_t now = time(NULL);
1587 if (glob("README*", 0, NULL, &pglob) != 0) return;
1589 for (i = 0; i < pglob.gl_pathc; i++) {
1590 const char * const temp = pglob.gl_pathv[i];
1596 if (stat(temp, &buf) == -1) continue;
1598 /* remove trailing LF */
1599 tm = ctime(&buf.st_mtime);
1600 tm[strlen(tm) - 1] = 0;
1602 snprintf(str, 256, "250-Please read the file %s\r\n"
1603 "250-\tIt was last modified %s - %ld days ago\r\n",
1605 (now - buf.st_mtime) / 86400);
1606 send(c->sock, str, strlen(str), 0);