8 #include <sys/socket.h>
9 #include <sys/select.h>
11 #include <arpa/inet.h>
12 #include <netinet/in.h>
21 #define closesocket close
22 #define fcntlsocket fcntl
24 #define select select_s
27 #define O_NONBLOCK 0x2000
37 static void free_dir(struct ftp_dirent *dir);
39 static int newconn(struct ftp *ftp);
40 static int sendcmd(struct ftp *ftp, const char *fmt, ...);
41 static int handle_control(struct ftp *ftp);
42 static int handle_data(struct ftp *ftp, int s);
43 static void proc_control(struct ftp *ftp, const char *buf);
45 static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls);
46 static int cproc_pasv(struct ftp *ftp, int code, const char *buf, void *cls);
47 static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls);
48 static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls);
50 static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls);
51 static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls);
54 struct ftp *ftp_alloc(void)
58 if(!(ftp = calloc(1, sizeof *ftp))) {
61 ftp->ctl = ftp->data = ftp->lis = -1;
64 ftp->dirent = darr_alloc(0, sizeof *ftp->dirent);
68 void ftp_free(struct ftp *ftp)
76 free_dir(ftp->dirent);
79 static void free_dir(struct ftp_dirent *dir)
82 for(i=0; i<darr_size(dir); i++) {
88 int ftp_connect(struct ftp *ftp, const char *hostname, int port)
91 struct sockaddr_in addr;
93 if((ftp->ctl = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
94 errmsg("failed to create control socket\n");
98 if(!(host = gethostbyname(hostname))) {
99 errmsg("failed to resolve host: %s\n", hostname);
100 closesocket(ftp->ctl);
105 memset(&addr, 0, sizeof addr);
106 addr.sin_family = AF_INET;
107 addr.sin_addr = *((struct in_addr*)host->h_addr);
108 addr.sin_port = htons(port);
110 if(connect(ftp->ctl, (struct sockaddr*)&addr, sizeof addr) == -1) {
111 errmsg("failed to connect to: %s (port: %d)\n", hostname, port);
112 closesocket(ftp->ctl);
117 fcntlsocket(ftp->ctl, F_SETFL, fcntlsocket(ftp->ctl, F_GETFL) | O_NONBLOCK);
122 void ftp_close(struct ftp *ftp)
125 closesocket(ftp->ctl);
130 closesocket(ftp->lis);
134 closesocket(ftp->data);
139 int ftp_sockets(struct ftp *ftp, int *sockv, int maxsize)
142 if(ftp->ctl >= 0 && maxsize-- > 0) {
145 if(ftp->lis >= 0 && maxsize-- > 0) {
148 if(ftp->data >= 0 && maxsize-- > 0) {
154 static void exec_op(struct ftp *ftp, int op, const char *arg)
166 ftp_chdir(ftp, "..");
178 ftp_delete(ftp, arg);
186 ftp_retrieve(ftp, arg);
198 static void exec_queued(struct ftp *ftp)
202 if(!(fop = ftp->qhead)) {
206 if(ftp->qtail == fop) {
207 ftp->qhead = ftp->qtail = 0;
209 ftp->qhead = ftp->qhead->next;
212 exec_op(ftp, fop->op, fop->arg);
219 int ftp_queue(struct ftp *ftp, int op, const char *arg)
223 if(!ftp->busy && !ftp->qhead) {
224 exec_op(ftp, op, arg);
228 if(!(fop = malloc(sizeof *fop))) {
232 if(!(fop->arg = strdup(arg))) {
243 ftp->qtail->next = fop;
246 ftp->qhead = ftp->qtail = fop;
251 int ftp_waitresp(struct ftp *ftp, long timeout)
262 FD_SET(ftp->ctl, &rdset);
269 if(select(ftp->ctl + 1, &rdset, 0, 0, timeout >= 0 ? &tv : 0) == -1 && errno == EINTR) {
273 if(FD_ISSET(ftp->ctl, &rdset)) {
275 ftp_handle(ftp, ftp->ctl);
282 timeout -= time(0) - start;
289 return ftp->last_resp;
292 static int ftp_active(struct ftp *ftp)
294 struct sockaddr_in sa = {0};
300 closesocket(ftp->lis);
303 closesocket(ftp->data);
307 if((ftp->lis = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
308 errmsg("ftp_active: failed to create listening socket\n");
313 getsockname(ftp->ctl, (struct sockaddr*)&sa, &len);
315 sa.sin_family = AF_INET;
318 if(bind(ftp->lis, (struct sockaddr*)&sa, sizeof sa) == -1) {
319 errmsg("ftp_active: failed to bind listening socket\n");
320 closesocket(ftp->lis);
327 if(getsockname(ftp->lis, (struct sockaddr*)&sa, &len) == -1) {
328 errmsg("ftp_active: failed to retrieve listening socket address\n");
329 closesocket(ftp->lis);
334 addr = ntohl(sa.sin_addr.s_addr);
335 port = ntohs(sa.sin_port);
336 infomsg("listening on %s port %d\n", inet_ntoa(sa.sin_addr), port);
338 sendcmd(ftp, "PORT %d,%d,%d,%d,%d,%d", addr >> 24, (addr >> 16) & 0xff,
339 (addr >> 8) & 0xff, addr & 0xff, port >> 8, port & 0xff);
341 ftp->cproc = cproc_active;
345 static int ftp_passive(struct ftp *ftp)
348 closesocket(ftp->lis);
352 closesocket(ftp->data);
356 sendcmd(ftp, "PASV");
357 ftp->cproc = cproc_pasv;
361 int ftp_handle(struct ftp *ftp, int s)
364 return handle_control(ftp);
367 return handle_data(ftp, s);
370 int ns = accept(s, 0, 0);
381 static int sendcmd(struct ftp *ftp, const char *fmt, ...)
393 vsprintf(buf, fmt, ap);
395 infomsg("send: %s\n", buf);
397 return send(ftp->ctl, buf, strlen(buf), 0);
400 static int handle_control(struct ftp *ftp)
403 char *buf, *start, *end;
406 if((sz = sizeof ftp->crecv - ftp->num_crecv) <= 0) {
408 warnmsg("discard buffer\n");
409 sz = sizeof ftp->crecv;
412 start = ftp->crecv + ftp->num_crecv;
413 if((rd = recv(ftp->ctl, start, sz, 0)) == -1) {
414 if(errno == EINTR) continue;
415 /* assume EWOULDBLOCK, try again next time */
425 for(i=0; i<rd; i++) {
426 if(start[i] == '\r') {
428 } else if(start[i] == '\n') {
430 proc_control(ftp, buf);
434 if(buf != ftp->crecv && buf < end) {
435 ftp->num_crecv = end - buf;
436 memmove(ftp->crecv, buf, ftp->num_crecv);
444 static int handle_data(struct ftp *ftp, int s)
448 if(ftp->data == -1) {
453 if((rd = recv(ftp->data, ftp->drecv, sizeof ftp->drecv, 0)) == -1) {
454 if(errno == EINTR) continue;
455 /* assume EWOULDBLOCK, try again next time */
459 /* call the callback first, so that we'll get a 0-count call to indicate
460 * EOF when the server closes the data connection
463 ftp->dproc(ftp, ftp->drecv, rd, ftp->dproc_cls);
467 closesocket(ftp->data);
475 static int respcode(const char *resp)
477 if(!isdigit(resp[0]) || !isdigit(resp[1]) || !isdigit(resp[2])) {
481 if(isspace(resp[3])) {
490 static void proc_control(struct ftp *ftp, const char *buf)
495 while(*buf && isspace(*buf)) buf++;
496 if((end = strchr(buf, '\r'))) {
500 infomsg("recv: %s\n", buf);
502 if((code = respcode(buf)) == 0) {
503 warnmsg("ignoring invalid response: %s\n", buf);
507 return; /* ignore continuations for now */
510 ftp->last_resp = code;
513 if(ftp->cproc(ftp, code, buf, ftp->cproc_cls) <= 0) {
517 /* execute next operation if there's one queued */
526 sendcmd(ftp, "user %s", ftp->user ? ftp->user : "anonymous");
529 sendcmd(ftp, "pass %s", ftp->pass ? ftp->pass : "foobar");
532 infomsg("login successful\n");
533 if(newconn(ftp) == -1) {
539 errmsg("login failed\n");
544 static int newconn(struct ftp *ftp)
546 ftp_queue(ftp, FTP_PWD, 0);
547 ftp_queue(ftp, FTP_LIST, 0);
551 int ftp_update(struct ftp *ftp)
556 int ftp_pwd(struct ftp *ftp)
559 ftp->cproc = cproc_pwd;
563 int ftp_chdir(struct ftp *ftp, const char *dirname)
565 if(strcmp(dirname, "..") == 0) {
566 sendcmd(ftp, "cdup");
568 sendcmd(ftp, "cwd %s", dirname);
570 ftp->cproc = cproc_cwd;
574 int ftp_mkdir(struct ftp *ftp, const char *dirname)
579 int ftp_rmdir(struct ftp *ftp, const char *dirname)
584 int ftp_delete(struct ftp *ftp, const char *fname)
589 static int prepare_data(struct ftp *ftp)
597 ftp_waitresp(ftp, TIMEOUT);
599 if(ftp_active(ftp) == -1) {
603 if(ftp->data == -1) {
614 int ftp_list(struct ftp *ftp)
616 struct recvbuf *rbuf;
618 if(prepare_data(ftp)) {
622 if(!(rbuf = malloc(sizeof *rbuf))) {
623 errmsg("failed to allocate receive buffer\n");
628 if(!(rbuf->buf = malloc(rbuf->bufsz))) {
630 errmsg("failed to allocate receive buffer\n");
634 sendcmd(ftp, "list");
635 ftp->cproc = cproc_list;
636 ftp->dproc = dproc_list;
637 ftp->cproc_cls = ftp->dproc_cls = rbuf;
641 int ftp_retrieve(struct ftp *ftp, const char *fname)
646 int ftp_store(struct ftp *ftp, const char *fname)
651 static int get_quoted_text(const char *str, char *buf)
654 const char *src, *end;
656 if(!(src = strchr(str, '"'))) {
661 while(*end && *end != '"') end++;
665 memcpy(buf, src, len);
670 static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls)
673 errmsg("ftp_active failed\n");
676 ftp->status = FTP_CONN_ACT;
681 static int cproc_pasv(struct ftp *ftp, int code, const char *buf, void *cls)
684 unsigned int addr[6];
685 struct sockaddr_in sa;
690 errmsg("ftp_passive failed\n");
696 if(sscanf(str, "%u,%u,%u,%u,%u,%u", addr, addr + 1, addr + 2, addr + 3,
697 addr + 4, addr + 5) == 6) {
702 if(!*str || (addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]) >= 256) {
703 errmsg("ftp_passive: failed to parse response: %s\n", buf);
706 port = (addr[4] << 8) | addr[5];
707 ipaddr = ((unsigned int)addr[0] << 24) | ((unsigned int)addr[1] << 16) |
708 ((unsigned int)addr[2] << 8) | addr[3];
710 if((ftp->data = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
711 fprintf(stderr, "ftp_passive: failed to allocate socket\n");
715 infomsg("passive mode: %d.%d.%d.%d port %d\n", addr[0], addr[1], addr[2], addr[3],
718 sa.sin_family = AF_INET;
719 sa.sin_addr.s_addr = htonl(ipaddr);
720 sa.sin_port = htons(port);
722 if(connect(ftp->data, (struct sockaddr*)&sa, sizeof sa) == -1) {
723 errmsg("ftp_passive: failed to connect to %s:%p\n", inet_ntoa(sa.sin_addr), port);
724 closesocket(ftp->data);
729 ftp->status = FTP_CONN_PASV;
738 static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls)
743 warnmsg("pwd failed\n");
747 dirname = alloca(strlen(buf) + 1);
748 if(get_quoted_text(buf, dirname) == -1) {
749 warnmsg("pwd: invalid response: %s\n", buf);
754 ftp->curdir = strdup_nf(dirname);
755 ftp->modified = FTP_MOD_DIR;
759 static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls)
762 warnmsg("cwd failed\n");
766 ftp_queue(ftp, FTP_PWD, 0);
767 ftp_queue(ftp, FTP_LIST, 0);
771 static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls)
779 errmsg("failed to retrieve directory listing\n");
784 #define SKIP_FIELD(p) \
786 while(*(p) && *(p) != '\n' && !isspace(*(p))) (p)++; \
787 while(*(p) && *(p) != '\n' && isspace(*(p))) (p)++; \
790 static int parse_dirent(struct ftp_dirent *ent, const char *line)
793 const char *ptr = line;
796 if(!(end = strchr(line, '\r')) && !(end = strchr(line, '\n'))) {
803 ent->type = FTP_FILE;
806 SKIP_FIELD(ptr); /* skip mode */
807 SKIP_FIELD(ptr); /* skip links */
808 SKIP_FIELD(ptr); /* skip owner */
809 SKIP_FIELD(ptr); /* skip group */
811 if(ent->type == FTP_FILE) {
812 ent->size = atoi(ptr);
814 SKIP_FIELD(ptr); /* skip size */
815 SKIP_FIELD(ptr); /* skip month */
816 SKIP_FIELD(ptr); /* skip day */
817 SKIP_FIELD(ptr); /* skip year */
819 if(ptr >= end) return -1;
822 ent->name = malloc(len + 1);
823 memcpy(ent->name, ptr, len);
829 int ftp_direntcmp(const void *a, const void *b)
831 const struct ftp_dirent *da = a, *db = b;
833 if(da->type == db->type) {
834 return strcmp(da->name, db->name);
836 return da->type == FTP_DIR ? -1 : 1;
839 static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls)
842 struct recvbuf *rbuf = cls;
845 /* EOF condition, we got the whole list, update directory entries */
846 char *ptr = rbuf->buf;
847 char *end = rbuf->buf + rbuf->size;
848 struct ftp_dirent ent;
850 darr_clear(ftp->dirent);
853 if(parse_dirent(&ent, ptr) != -1) {
854 darr_push(ftp->dirent, &ent);
856 while(ptr < end && *ptr != '\n' && *ptr != '\r') ptr++;
857 while(ptr < end && (*ptr == '\r' || *ptr == '\n')) ptr++;
859 ftp->modified |= FTP_MOD_DIR;
865 num = darr_size(ftp->dirent);
866 qsort(ftp->dirent, num, sizeof *ftp->dirent, ftp_direntcmp);
870 if(rbuf->size + sz > rbuf->bufsz) {
872 int newsz = rbuf->bufsz << 1;
874 if(!(tmp = realloc(rbuf->buf, newsz))) {
875 errmsg("failed to resize receive buffer\n");
882 memcpy(rbuf->buf + rbuf->size, buf, sz);
886 const char *ftp_curdir(struct ftp *ftp)
891 int ftp_num_dirent(struct ftp *ftp)
893 return darr_size(ftp->dirent);
896 struct ftp_dirent *ftp_dirent(struct ftp *ftp, int idx)
898 return ftp->dirent + idx;