8 #include <sys/socket.h>
10 #include <netinet/in.h>
19 #define closesocket close
20 #define fcntlsocket fcntl
25 static void free_dir(struct ftp_dirent *dir);
27 static int newconn(struct ftp *ftp);
28 static int sendcmd(struct ftp *ftp, const char *fmt, ...);
29 static int handle_control(struct ftp *ftp);
30 static int handle_data(struct ftp *ftp, int s);
31 static void proc_control(struct ftp *ftp, const char *buf);
33 static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls);
34 static int cproc_pasv(struct ftp *ftp, int code, const char *buf, void *cls);
35 static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls);
36 static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls);
38 static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls);
39 static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls);
42 struct ftp *ftp_alloc(void)
46 if(!(ftp = calloc(1, sizeof *ftp))) {
49 ftp->ctl = ftp->data = ftp->lis = -1;
52 ftp->dirent = darr_alloc(0, sizeof *ftp->dirent);
56 void ftp_free(struct ftp *ftp)
64 free_dir(ftp->dirent);
67 static void free_dir(struct ftp_dirent *dir)
70 for(i=0; i<darr_size(dir); i++) {
76 int ftp_connect(struct ftp *ftp, const char *hostname, int port)
79 struct sockaddr_in addr;
81 if((ftp->ctl = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
82 errmsg("failed to create control socket\n");
86 if(!(host = gethostbyname(hostname))) {
87 errmsg("failed to resolve host: %s\n", hostname);
88 closesocket(ftp->ctl);
93 memset(&addr, 0, sizeof addr);
94 addr.sin_family = AF_INET;
95 addr.sin_addr = *((struct in_addr*)host->h_addr);
96 addr.sin_port = htons(port);
98 if(connect(ftp->ctl, (struct sockaddr*)&addr, sizeof addr) == -1) {
99 errmsg("failed to connect to: %s (port: %d)\n", hostname, port);
100 closesocket(ftp->ctl);
105 fcntlsocket(ftp->ctl, F_SETFL, fcntlsocket(ftp->ctl, F_GETFL) | O_NONBLOCK);
110 void ftp_close(struct ftp *ftp)
113 closesocket(ftp->ctl);
118 closesocket(ftp->lis);
122 closesocket(ftp->data);
127 int ftp_sockets(struct ftp *ftp, int *sockv, int maxsize)
130 if(ftp->ctl >= 0 && maxsize-- > 0) {
133 if(ftp->lis >= 0 && maxsize-- > 0) {
136 if(ftp->data >= 0 && maxsize-- > 0) {
142 static void exec_op(struct ftp *ftp, int op, const char *arg)
154 ftp_chdir(ftp, "..");
166 ftp_delete(ftp, arg);
174 ftp_retrieve(ftp, arg);
186 static void exec_queued(struct ftp *ftp)
190 if(!(fop = ftp->qhead)) {
194 if(ftp->qtail == fop) {
195 ftp->qhead = ftp->qtail = 0;
197 ftp->qhead = ftp->qhead->next;
200 exec_op(ftp, fop->op, fop->arg);
207 int ftp_queue(struct ftp *ftp, int op, const char *arg)
211 if(!ftp->busy && !ftp->qhead) {
212 exec_op(ftp, op, arg);
216 if(!(fop = malloc(sizeof *fop))) {
220 if(!(fop->arg = strdup(arg))) {
231 ftp->qtail->next = fop;
234 ftp->qhead = ftp->qtail = fop;
239 int ftp_waitresp(struct ftp *ftp, time_t timeout)
250 FD_SET(ftp->ctl, &rdset);
257 if(select(ftp->ctl + 1, &rdset, 0, 0, timeout >= 0 ? &tv : 0) == -1 && errno == EINTR) {
261 if(FD_ISSET(ftp->ctl, &rdset)) {
263 ftp_handle(ftp, ftp->ctl);
270 timeout -= time(0) - start;
277 return ftp->last_resp;
280 static int ftp_active(struct ftp *ftp)
282 struct sockaddr_in sa = {0};
288 closesocket(ftp->lis);
291 closesocket(ftp->data);
295 if((ftp->lis = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
296 errmsg("ftp_active: failed to create listening socket\n");
301 getsockname(ftp->ctl, (struct sockaddr*)&sa, &len);
303 sa.sin_family = AF_INET;
306 if(bind(ftp->lis, (struct sockaddr*)&sa, sizeof sa) == -1) {
307 errmsg("ftp_active: failed to bind listening socket\n");
308 closesocket(ftp->lis);
315 if(getsockname(ftp->lis, (struct sockaddr*)&sa, &len) == -1) {
316 errmsg("ftp_active: failed to retrieve listening socket address\n");
317 closesocket(ftp->lis);
322 addr = ntohl(sa.sin_addr.s_addr);
323 port = ntohs(sa.sin_port);
324 infomsg("listening on %s port %d\n", inet_ntoa(sa.sin_addr), port);
326 sendcmd(ftp, "PORT %d,%d,%d,%d,%d,%d", addr >> 24, (addr >> 16) & 0xff,
327 (addr >> 8) & 0xff, addr & 0xff, port >> 8, port & 0xff);
329 ftp->cproc = cproc_active;
333 static int ftp_passive(struct ftp *ftp)
336 closesocket(ftp->lis);
340 closesocket(ftp->data);
344 sendcmd(ftp, "PASV");
345 ftp->cproc = cproc_pasv;
349 int ftp_handle(struct ftp *ftp, int s)
352 return handle_control(ftp);
355 return handle_data(ftp, s);
358 int ns = accept(s, 0, 0);
369 static int sendcmd(struct ftp *ftp, const char *fmt, ...)
381 vsprintf(buf, fmt, ap);
383 infomsg("send: %s\n", buf);
385 return send(ftp->ctl, buf, strlen(buf), 0);
388 static int handle_control(struct ftp *ftp)
391 char *buf, *start, *end;
394 if((sz = sizeof ftp->crecv - ftp->num_crecv) <= 0) {
396 warnmsg("discard buffer\n");
397 sz = sizeof ftp->crecv;
400 start = ftp->crecv + ftp->num_crecv;
401 if((rd = recv(ftp->ctl, start, sz, 0)) == -1) {
402 if(errno == EINTR) continue;
403 /* assume EWOULDBLOCK, try again next time */
413 for(i=0; i<rd; i++) {
414 if(start[i] == '\r') {
416 } else if(start[i] == '\n') {
418 proc_control(ftp, buf);
422 if(buf != ftp->crecv && buf < end) {
423 ftp->num_crecv = end - buf;
424 memmove(ftp->crecv, buf, ftp->num_crecv);
432 static int handle_data(struct ftp *ftp, int s)
436 if(ftp->data == -1) {
441 if((rd = recv(ftp->data, ftp->drecv, sizeof ftp->drecv, 0)) == -1) {
442 if(errno == EINTR) continue;
443 /* assume EWOULDBLOCK, try again next time */
447 /* call the callback first, so that we'll get a 0-count call to indicate
448 * EOF when the server closes the data connection
451 ftp->dproc(ftp, ftp->drecv, rd, ftp->dproc_cls);
455 closesocket(ftp->data);
463 static int respcode(const char *resp)
465 if(!isdigit(resp[0]) || !isdigit(resp[1]) || !isdigit(resp[2])) {
469 if(isspace(resp[3])) {
478 static void proc_control(struct ftp *ftp, const char *buf)
483 while(*buf && isspace(*buf)) buf++;
484 if((end = strchr(buf, '\r'))) {
488 infomsg("recv: %s\n", buf);
490 if((code = respcode(buf)) == 0) {
491 warnmsg("ignoring invalid response: %s\n", buf);
495 return; /* ignore continuations for now */
498 ftp->last_resp = code;
501 if(ftp->cproc(ftp, code, buf, ftp->cproc_cls) <= 0) {
505 /* execute next operation if there's one queued */
514 sendcmd(ftp, "user %s", ftp->user ? ftp->user : "anonymous");
517 sendcmd(ftp, "pass %s", ftp->pass ? ftp->pass : "foobar");
520 infomsg("login successful\n");
521 if(newconn(ftp) == -1) {
527 errmsg("login failed\n");
532 static int newconn(struct ftp *ftp)
534 ftp_queue(ftp, FTP_PWD, 0);
535 ftp_queue(ftp, FTP_LIST, 0);
539 int ftp_update(struct ftp *ftp)
544 int ftp_pwd(struct ftp *ftp)
547 ftp->cproc = cproc_pwd;
551 int ftp_chdir(struct ftp *ftp, const char *dirname)
553 if(strcmp(dirname, "..") == 0) {
554 sendcmd(ftp, "cdup");
556 sendcmd(ftp, "cwd %s", dirname);
558 ftp->cproc = cproc_cwd;
562 int ftp_mkdir(struct ftp *ftp, const char *dirname)
567 int ftp_rmdir(struct ftp *ftp, const char *dirname)
572 int ftp_delete(struct ftp *ftp, const char *fname)
577 static int prepare_data(struct ftp *ftp)
585 ftp_waitresp(ftp, TIMEOUT);
587 if(ftp_active(ftp) == -1) {
591 if(ftp->data == -1) {
602 int ftp_list(struct ftp *ftp)
604 struct recvbuf *rbuf;
606 if(prepare_data(ftp)) {
610 if(!(rbuf = malloc(sizeof *rbuf))) {
611 errmsg("failed to allocate receive buffer\n");
616 if(!(rbuf->buf = malloc(rbuf->bufsz))) {
618 errmsg("failed to allocate receive buffer\n");
622 sendcmd(ftp, "list");
623 ftp->cproc = cproc_list;
624 ftp->dproc = dproc_list;
625 ftp->cproc_cls = ftp->dproc_cls = rbuf;
629 int ftp_retrieve(struct ftp *ftp, const char *fname)
634 int ftp_store(struct ftp *ftp, const char *fname)
639 static int get_quoted_text(const char *str, char *buf)
642 const char *src, *end;
644 if(!(src = strchr(str, '"'))) {
649 while(*end && *end != '"') end++;
653 memcpy(buf, src, len);
658 static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls)
661 errmsg("ftp_active failed\n");
664 ftp->status = FTP_CONN_ACT;
669 static int cproc_pasv(struct ftp *ftp, int code, const char *buf, void *cls)
672 unsigned int addr[6];
673 struct sockaddr_in sa;
678 errmsg("ftp_passive failed\n");
684 if(sscanf(str, "%u,%u,%u,%u,%u,%u", addr, addr + 1, addr + 2, addr + 3,
685 addr + 4, addr + 5) == 6) {
690 if(!*str || (addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]) >= 256) {
691 errmsg("ftp_passive: failed to parse response: %s\n", buf);
694 port = (addr[4] << 8) | addr[5];
695 ipaddr = ((uint32_t)addr[0] << 24) | ((uint32_t)addr[1] << 16) |
696 ((uint32_t)addr[2] << 8) | addr[3];
698 if((ftp->data = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
699 fprintf(stderr, "ftp_passive: failed to allocate socket\n");
703 infomsg("passive mode: %d.%d.%d.%d port %d\n", addr[0], addr[1], addr[2], addr[3],
706 sa.sin_family = AF_INET;
707 sa.sin_addr.s_addr = htonl(ipaddr);
708 sa.sin_port = htons(port);
710 if(connect(ftp->data, (struct sockaddr*)&sa, sizeof sa) == -1) {
711 errmsg("ftp_passive: failed to connect to %s:%p\n", inet_ntoa(sa.sin_addr), port);
717 ftp->status = FTP_CONN_PASV;
726 static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls)
731 warnmsg("pwd failed\n");
735 dirname = alloca(strlen(buf) + 1);
736 if(get_quoted_text(buf, dirname) == -1) {
737 warnmsg("pwd: invalid response: %s\n", buf);
742 ftp->curdir = strdup_nf(dirname);
743 ftp->modified = FTP_MOD_DIR;
747 static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls)
750 warnmsg("cwd failed\n");
754 ftp_queue(ftp, FTP_PWD, 0);
755 ftp_queue(ftp, FTP_LIST, 0);
759 static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls)
767 errmsg("failed to retrieve directory listing\n");
772 #define SKIP_FIELD(p) \
774 while(*(p) && *(p) != '\n' && !isspace(*(p))) (p)++; \
775 while(*(p) && *(p) != '\n' && isspace(*(p))) (p)++; \
778 static int parse_dirent(struct ftp_dirent *ent, const char *line)
781 const char *ptr = line;
784 if(!(end = strchr(line, '\r')) && !(end = strchr(line, '\n'))) {
791 ent->type = FTP_FILE;
794 SKIP_FIELD(ptr); /* skip mode */
795 SKIP_FIELD(ptr); /* skip links */
796 SKIP_FIELD(ptr); /* skip owner */
797 SKIP_FIELD(ptr); /* skip group */
799 if(ent->type == FTP_FILE) {
800 ent->size = atoi(ptr);
802 SKIP_FIELD(ptr); /* skip size */
803 SKIP_FIELD(ptr); /* skip month */
804 SKIP_FIELD(ptr); /* skip day */
805 SKIP_FIELD(ptr); /* skip year */
807 if(ptr >= end) return -1;
810 ent->name = malloc(len + 1);
811 memcpy(ent->name, ptr, len);
817 int ftp_direntcmp(const void *a, const void *b)
819 const struct ftp_dirent *da = a, *db = b;
821 if(da->type == db->type) {
822 return strcmp(da->name, db->name);
824 return da->type == FTP_DIR ? -1 : 1;
827 static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls)
830 struct recvbuf *rbuf = cls;
833 /* EOF condition, we got the whole list, update directory entries */
834 char *ptr = rbuf->buf;
835 char *end = rbuf->buf + rbuf->size;
836 struct ftp_dirent ent;
838 darr_clear(ftp->dirent);
841 if(parse_dirent(&ent, ptr) != -1) {
842 darr_push(ftp->dirent, &ent);
844 while(ptr < end && *ptr != '\n' && *ptr != '\r') ptr++;
845 while(ptr < end && (*ptr == '\r' || *ptr == '\n')) ptr++;
847 ftp->modified |= FTP_MOD_DIR;
853 num = darr_size(ftp->dirent);
854 qsort(ftp->dirent, num, sizeof *ftp->dirent, ftp_direntcmp);
858 if(rbuf->size + sz > rbuf->bufsz) {
860 int newsz = rbuf->bufsz << 1;
862 if(!(tmp = realloc(rbuf->buf, newsz))) {
863 errmsg("failed to resize receive buffer\n");
870 memcpy(rbuf->buf + rbuf->size, buf, sz);
874 const char *ftp_curdir(struct ftp *ftp)
879 int ftp_num_dirent(struct ftp *ftp)
881 return darr_size(ftp->dirent);
884 struct ftp_dirent *ftp_dirent(struct ftp *ftp, int idx)
886 return ftp->dirent + idx;