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[0] = darr_alloc(0, sizeof *ftp->dirent[0]);
53 ftp->dirent[1] = darr_alloc(0, sizeof *ftp->dirent[1]);
57 void ftp_free(struct ftp *ftp)
65 free_dir(ftp->dirent[0]);
66 free_dir(ftp->dirent[1]);
69 static void free_dir(struct ftp_dirent *dir)
72 for(i=0; i<darr_size(dir); i++) {
78 int ftp_connect(struct ftp *ftp, const char *hostname, int port)
81 struct sockaddr_in addr;
83 if((ftp->ctl = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
84 errmsg("failed to create control socket\n");
88 if(!(host = gethostbyname(hostname))) {
89 errmsg("failed to resolve host: %s\n", hostname);
90 closesocket(ftp->ctl);
95 memset(&addr, 0, sizeof addr);
96 addr.sin_family = AF_INET;
97 addr.sin_addr = *((struct in_addr*)host->h_addr);
98 addr.sin_port = htons(port);
100 if(connect(ftp->ctl, (struct sockaddr*)&addr, sizeof addr) == -1) {
101 errmsg("failed to connect to: %s (port: %d)\n", hostname, port);
102 closesocket(ftp->ctl);
107 fcntlsocket(ftp->ctl, F_SETFL, fcntlsocket(ftp->ctl, F_GETFL) | O_NONBLOCK);
112 void ftp_close(struct ftp *ftp)
115 closesocket(ftp->ctl);
120 closesocket(ftp->lis);
124 closesocket(ftp->data);
129 int ftp_sockets(struct ftp *ftp, int *sockv, int maxsize)
132 if(ftp->ctl >= 0 && maxsize-- > 0) {
135 if(ftp->lis >= 0 && maxsize-- > 0) {
138 if(ftp->data >= 0 && maxsize-- > 0) {
144 static void exec_op(struct ftp *ftp, int op, const char *arg)
156 ftp_chdir(ftp, "..");
168 ftp_delete(ftp, arg);
176 ftp_retrieve(ftp, arg);
188 static void exec_queued(struct ftp *ftp)
192 if(!(fop = ftp->qhead)) {
196 if(ftp->qtail == fop) {
197 ftp->qhead = ftp->qtail = 0;
199 ftp->qhead = ftp->qhead->next;
202 exec_op(ftp, fop->op, fop->arg);
209 int ftp_queue(struct ftp *ftp, int op, const char *arg)
213 if(!ftp->busy && !ftp->qhead) {
214 exec_op(ftp, op, arg);
218 if(!(fop = malloc(sizeof *fop))) {
222 if(!(fop->arg = strdup(arg))) {
233 ftp->qtail->next = fop;
236 ftp->qhead = ftp->qtail = fop;
241 int ftp_waitresp(struct ftp *ftp, time_t timeout)
252 FD_SET(ftp->ctl, &rdset);
259 if(select(ftp->ctl + 1, &rdset, 0, 0, timeout >= 0 ? &tv : 0) == -1 && errno == EINTR) {
263 if(FD_ISSET(ftp->ctl, &rdset)) {
265 ftp_handle(ftp, ftp->ctl);
272 timeout -= time(0) - start;
279 return ftp->last_resp;
282 static int ftp_active(struct ftp *ftp)
284 struct sockaddr_in sa = {0};
290 closesocket(ftp->lis);
293 closesocket(ftp->data);
297 if((ftp->lis = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
298 errmsg("ftp_active: failed to create listening socket\n");
303 getsockname(ftp->ctl, (struct sockaddr*)&sa, &len);
305 sa.sin_family = AF_INET;
308 if(bind(ftp->lis, (struct sockaddr*)&sa, sizeof sa) == -1) {
309 errmsg("ftp_active: failed to bind listening socket\n");
310 closesocket(ftp->lis);
317 if(getsockname(ftp->lis, (struct sockaddr*)&sa, &len) == -1) {
318 errmsg("ftp_active: failed to retrieve listening socket address\n");
319 closesocket(ftp->lis);
324 addr = ntohl(sa.sin_addr.s_addr);
325 port = ntohs(sa.sin_port);
326 infomsg("listening on %s port %d\n", inet_ntoa(sa.sin_addr), port);
328 sendcmd(ftp, "PORT %d,%d,%d,%d,%d,%d", addr >> 24, (addr >> 16) & 0xff,
329 (addr >> 8) & 0xff, addr & 0xff, port >> 8, port & 0xff);
331 ftp->cproc = cproc_active;
335 static int ftp_passive(struct ftp *ftp)
338 closesocket(ftp->lis);
342 closesocket(ftp->data);
346 sendcmd(ftp, "PASV");
347 ftp->cproc = cproc_pasv;
351 int ftp_handle(struct ftp *ftp, int s)
354 return handle_control(ftp);
357 return handle_data(ftp, s);
360 int ns = accept(s, 0, 0);
371 static int sendcmd(struct ftp *ftp, const char *fmt, ...)
383 vsprintf(buf, fmt, ap);
385 infomsg("send: %s\n", buf);
387 return send(ftp->ctl, buf, strlen(buf), 0);
390 static int handle_control(struct ftp *ftp)
393 char *buf, *start, *end;
396 if((sz = sizeof ftp->crecv - ftp->num_crecv) <= 0) {
398 warnmsg("discard buffer\n");
399 sz = sizeof ftp->crecv;
402 start = ftp->crecv + ftp->num_crecv;
403 if((rd = recv(ftp->ctl, start, sz, 0)) == -1) {
404 if(errno == EINTR) continue;
405 /* assume EWOULDBLOCK, try again next time */
415 for(i=0; i<rd; i++) {
416 if(start[i] == '\r') {
418 } else if(start[i] == '\n') {
420 proc_control(ftp, buf);
424 if(buf != ftp->crecv && buf < end) {
425 ftp->num_crecv = end - buf;
426 memmove(ftp->crecv, buf, ftp->num_crecv);
434 static int handle_data(struct ftp *ftp, int s)
438 if(ftp->data == -1) {
443 if((rd = recv(ftp->data, ftp->drecv, sizeof ftp->drecv, 0)) == -1) {
444 if(errno == EINTR) continue;
445 /* assume EWOULDBLOCK, try again next time */
449 /* call the callback first, so that we'll get a 0-count call to indicate
450 * EOF when the server closes the data connection
453 ftp->dproc(ftp, ftp->drecv, rd, ftp->dproc_cls);
457 closesocket(ftp->data);
465 static int respcode(const char *resp)
467 if(!isdigit(resp[0]) || !isdigit(resp[1]) || !isdigit(resp[2])) {
471 if(isspace(resp[3])) {
480 static void proc_control(struct ftp *ftp, const char *buf)
485 while(*buf && isspace(*buf)) buf++;
486 if((end = strchr(buf, '\r'))) {
490 infomsg("recv: %s\n", buf);
492 if((code = respcode(buf)) == 0) {
493 warnmsg("ignoring invalid response: %s\n", buf);
497 return; /* ignore continuations for now */
500 ftp->last_resp = code;
503 if(ftp->cproc(ftp, code, buf, ftp->cproc_cls) <= 0) {
507 /* execute next operation if there's one queued */
516 sendcmd(ftp, "user %s", ftp->user ? ftp->user : "anonymous");
519 sendcmd(ftp, "pass %s", ftp->pass ? ftp->pass : "foobar");
522 infomsg("login successful\n");
523 if(newconn(ftp) == -1) {
529 errmsg("login failed\n");
534 static int newconn(struct ftp *ftp)
536 ftp_queue(ftp, FTP_PWD, 0);
537 ftp_queue(ftp, FTP_LIST, 0);
541 int ftp_update(struct ftp *ftp)
546 int ftp_pwd(struct ftp *ftp)
549 ftp->cproc = cproc_pwd;
553 int ftp_chdir(struct ftp *ftp, const char *dirname)
555 if(strcmp(dirname, "..") == 0) {
556 sendcmd(ftp, "cdup");
558 sendcmd(ftp, "cwd %s", dirname);
560 ftp->cproc = cproc_cwd;
564 int ftp_mkdir(struct ftp *ftp, const char *dirname)
569 int ftp_rmdir(struct ftp *ftp, const char *dirname)
574 int ftp_delete(struct ftp *ftp, const char *fname)
579 static int prepare_data(struct ftp *ftp)
587 ftp_waitresp(ftp, TIMEOUT);
589 if(ftp_active(ftp) == -1) {
593 if(ftp->data == -1) {
604 int ftp_list(struct ftp *ftp)
606 struct recvbuf *rbuf;
608 if(prepare_data(ftp)) {
612 if(!(rbuf = malloc(sizeof *rbuf))) {
613 errmsg("failed to allocate receive buffer\n");
618 if(!(rbuf->buf = malloc(rbuf->bufsz))) {
620 errmsg("failed to allocate receive buffer\n");
624 sendcmd(ftp, "list");
625 ftp->cproc = cproc_list;
626 ftp->dproc = dproc_list;
627 ftp->cproc_cls = ftp->dproc_cls = rbuf;
631 int ftp_retrieve(struct ftp *ftp, const char *fname)
636 int ftp_store(struct ftp *ftp, const char *fname)
641 static int get_quoted_text(const char *str, char *buf)
644 const char *src, *end;
646 if(!(src = strchr(str, '"'))) {
651 while(*end && *end != '"') end++;
655 memcpy(buf, src, len);
660 static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls)
663 errmsg("ftp_active failed\n");
666 ftp->status = FTP_CONN_ACT;
671 static int cproc_pasv(struct ftp *ftp, int code, const char *buf, void *cls)
674 unsigned int addr[6];
675 struct sockaddr_in sa;
680 errmsg("ftp_passive failed\n");
686 if(sscanf(str, "%u,%u,%u,%u,%u,%u", addr, addr + 1, addr + 2, addr + 3,
687 addr + 4, addr + 5) == 6) {
692 if(!*str || (addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]) >= 256) {
693 errmsg("ftp_passive: failed to parse response: %s\n", buf);
696 port = (addr[4] << 8) | addr[5];
697 ipaddr = ((uint32_t)addr[0] << 24) | ((uint32_t)addr[1] << 16) |
698 ((uint32_t)addr[2] << 8) | addr[3];
700 if((ftp->data = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
701 fprintf(stderr, "ftp_passive: failed to allocate socket\n");
705 infomsg("passive mode: %d.%d.%d.%d port %d\n", addr[0], addr[1], addr[2], addr[3],
708 sa.sin_family = AF_INET;
709 sa.sin_addr.s_addr = htonl(ipaddr);
710 sa.sin_port = htons(port);
712 if(connect(ftp->data, (struct sockaddr*)&sa, sizeof sa) == -1) {
713 errmsg("ftp_passive: failed to connect to %s:%p\n", inet_ntoa(sa.sin_addr), port);
719 ftp->status = FTP_CONN_PASV;
728 static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls)
733 warnmsg("pwd failed\n");
737 dirname = alloca(strlen(buf) + 1);
738 if(get_quoted_text(buf, dirname) == -1) {
739 warnmsg("pwd: invalid response: %s\n", buf);
743 free(ftp->curdir[FTP_REMOTE]);
744 ftp->curdir[FTP_REMOTE] = strdup_nf(dirname);
745 ftp->modified = FTP_MOD_REMDIR;
749 static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls)
752 warnmsg("cwd failed\n");
756 ftp_queue(ftp, FTP_PWD, 0);
757 ftp_queue(ftp, FTP_LIST, 0);
761 static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls)
769 errmsg("failed to retrieve directory listing\n");
774 #define SKIP_FIELD(p) \
776 while(*(p) && *(p) != '\n' && !isspace(*(p))) (p)++; \
777 while(*(p) && *(p) != '\n' && isspace(*(p))) (p)++; \
780 static int parse_dirent(struct ftp_dirent *ent, const char *line)
783 const char *ptr = line;
786 if(!(end = strchr(line, '\r')) && !(end = strchr(line, '\n'))) {
793 ent->type = FTP_FILE;
796 SKIP_FIELD(ptr); /* skip mode */
797 SKIP_FIELD(ptr); /* skip links */
798 SKIP_FIELD(ptr); /* skip owner */
799 SKIP_FIELD(ptr); /* skip group */
801 if(ent->type == FTP_FILE) {
802 ent->size = atoi(ptr);
804 SKIP_FIELD(ptr); /* skip size */
805 SKIP_FIELD(ptr); /* skip month */
806 SKIP_FIELD(ptr); /* skip day */
807 SKIP_FIELD(ptr); /* skip year */
809 if(ptr >= end) return -1;
812 ent->name = malloc(len + 1);
813 memcpy(ent->name, ptr, len);
819 static int direntcmp(const void *a, const void *b)
821 const struct ftp_dirent *da = a, *db = b;
823 if(da->type == db->type) {
824 return strcmp(da->name, db->name);
826 return da->type == FTP_DIR ? -1 : 1;
829 static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls)
832 struct recvbuf *rbuf = cls;
835 /* EOF condition, we got the whole list, update directory entries */
836 char *ptr = rbuf->buf;
837 char *end = rbuf->buf + rbuf->size;
838 struct ftp_dirent ent;
840 darr_clear(ftp->dirent[FTP_REMOTE]);
843 if(parse_dirent(&ent, ptr) != -1) {
844 darr_push(ftp->dirent[FTP_REMOTE], &ent);
846 while(ptr < end && *ptr != '\n' && *ptr != '\r') ptr++;
847 while(ptr < end && (*ptr == '\r' || *ptr == '\n')) ptr++;
849 ftp->modified |= FTP_MOD_REMDIR;
855 num = darr_size(ftp->dirent[FTP_REMOTE]);
856 qsort(ftp->dirent[FTP_REMOTE], num, sizeof *ftp->dirent[FTP_REMOTE], direntcmp);
860 if(rbuf->size + sz > rbuf->bufsz) {
862 int newsz = rbuf->bufsz << 1;
864 if(!(tmp = realloc(rbuf->buf, newsz))) {
865 errmsg("failed to resize receive buffer\n");
872 memcpy(rbuf->buf + rbuf->size, buf, sz);
876 const char *ftp_curdir(struct ftp *ftp, int whichdir)
878 return ftp->curdir[whichdir];
881 int ftp_num_dirent(struct ftp *ftp, int whichdir)
883 return darr_size(ftp->dirent[whichdir]);
886 struct ftp_dirent *ftp_dirent(struct ftp *ftp, int whichdir, int idx)
888 return ftp->dirent[whichdir] + idx;