8 #include <sys/socket.h>
10 #include <netinet/in.h>
19 #define closesocket close
20 #define fcntlsocket fcntl
25 static int newconn(struct ftp *ftp);
26 static int sendcmd(struct ftp *ftp, const char *fmt, ...);
27 static int handle_control(struct ftp *ftp);
28 static int handle_data(struct ftp *ftp, int s);
29 static void proc_control(struct ftp *ftp, const char *buf);
31 static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls);
32 static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls);
33 static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls);
35 static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls);
36 static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls);
39 struct ftp *ftp_alloc(void)
43 if(!(ftp = calloc(1, sizeof *ftp))) {
46 ftp->ctl = ftp->data = ftp->lis = -1;
50 void ftp_free(struct ftp *ftp)
59 int ftp_connect(struct ftp *ftp, const char *hostname, int port)
62 struct sockaddr_in addr;
64 if((ftp->ctl = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
65 errmsg("failed to create control socket\n");
69 if(!(host = gethostbyname(hostname))) {
70 errmsg("failed to resolve host: %s\n", hostname);
71 closesocket(ftp->ctl);
76 memset(&addr, 0, sizeof addr);
77 addr.sin_family = AF_INET;
78 addr.sin_addr = *((struct in_addr*)host->h_addr);
79 addr.sin_port = htons(port);
81 if(connect(ftp->ctl, (struct sockaddr*)&addr, sizeof addr) == -1) {
82 errmsg("failed to connect to: %s (port: %d)\n", hostname, port);
83 closesocket(ftp->ctl);
88 fcntlsocket(ftp->ctl, F_SETFL, fcntlsocket(ftp->ctl, F_GETFL) | O_NONBLOCK);
93 void ftp_close(struct ftp *ftp)
96 closesocket(ftp->ctl);
101 closesocket(ftp->lis);
105 closesocket(ftp->data);
110 int ftp_sockets(struct ftp *ftp, int *sockv, int maxsize)
113 if(ftp->ctl >= 0 && maxsize-- > 0) {
116 if(ftp->lis >= 0 && maxsize-- > 0) {
119 if(ftp->data >= 0 && maxsize-- > 0) {
125 static void exec_op(struct ftp *ftp, int op, const char *arg)
145 ftp_delete(ftp, arg);
153 ftp_retrieve(ftp, arg);
165 static void exec_queued(struct ftp *ftp)
169 if(!(fop = ftp->qhead)) {
173 if(ftp->qtail == fop) {
174 ftp->qhead = ftp->qtail = 0;
176 ftp->qhead = ftp->qhead->next;
179 exec_op(ftp, fop->op, fop->arg);
186 int ftp_queue(struct ftp *ftp, int op, const char *arg)
190 if(!ftp->busy && !ftp->qhead) {
191 exec_op(ftp, op, arg);
195 if(!(fop = malloc(sizeof *fop))) {
199 if(!(fop->arg = strdup(arg))) {
210 ftp->qtail->next = fop;
213 ftp->qhead = ftp->qtail = fop;
218 int ftp_waitresp(struct ftp *ftp, time_t timeout)
229 FD_SET(ftp->ctl, &rdset);
236 if(select(ftp->ctl + 1, &rdset, 0, 0, timeout >= 0 ? &tv : 0) == -1 && errno == EINTR) {
240 if(FD_ISSET(ftp->ctl, &rdset)) {
242 ftp_handle(ftp, ftp->ctl);
249 timeout -= time(0) - start;
256 return ftp->last_resp;
259 static int ftp_active(struct ftp *ftp)
261 struct sockaddr_in sa = {0};
267 closesocket(ftp->lis);
270 closesocket(ftp->data);
274 if((ftp->lis = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
275 errmsg("ftp_active: failed to create listening socket\n");
280 getsockname(ftp->ctl, (struct sockaddr*)&sa, &len);
282 sa.sin_family = AF_INET;
285 if(bind(ftp->lis, (struct sockaddr*)&sa, sizeof sa) == -1) {
286 errmsg("ftp_active: failed to bind listening socket\n");
287 closesocket(ftp->lis);
294 if(getsockname(ftp->lis, (struct sockaddr*)&sa, &len) == -1) {
295 errmsg("ftp_active: failed to retrieve listening socket address\n");
296 closesocket(ftp->lis);
301 addr = ntohl(sa.sin_addr.s_addr);
302 port = ntohs(sa.sin_port);
303 infomsg("listening on %s port %d\n", inet_ntoa(sa.sin_addr), port);
305 sendcmd(ftp, "PORT %d,%d,%d,%d,%d,%d", addr >> 24, (addr >> 16) & 0xff,
306 (addr >> 8) & 0xff, addr & 0xff, port >> 8, port & 0xff);
308 ftp->cproc = cproc_active;
312 int ftp_handle(struct ftp *ftp, int s)
315 return handle_control(ftp);
318 return handle_data(ftp, s);
321 int ns = accept(s, 0, 0);
332 static int sendcmd(struct ftp *ftp, const char *fmt, ...)
344 vsprintf(buf, fmt, ap);
346 infomsg("send: %s\n", buf);
348 return send(ftp->ctl, buf, strlen(buf), 0);
351 static int handle_control(struct ftp *ftp)
354 char *buf, *start, *end;
357 if((sz = sizeof ftp->crecv - ftp->num_crecv) <= 0) {
359 warnmsg("discard buffer\n");
360 sz = sizeof ftp->crecv;
363 start = ftp->crecv + ftp->num_crecv;
364 if((rd = recv(ftp->ctl, start, sz, 0)) == -1) {
365 if(errno == EINTR) continue;
366 /* assume EWOULDBLOCK, try again next time */
376 for(i=0; i<rd; i++) {
377 if(start[i] == '\r') {
379 } else if(start[i] == '\n') {
381 proc_control(ftp, buf);
385 if(buf != ftp->crecv && buf < end) {
386 ftp->num_crecv = end - buf;
387 memmove(ftp->crecv, buf, ftp->num_crecv);
395 static int handle_data(struct ftp *ftp, int s)
399 if(ftp->data == -1) {
404 if((rd = recv(ftp->data, ftp->drecv, sizeof ftp->drecv, 0)) == -1) {
405 if(errno == EINTR) continue;
406 /* assume EWOULDBLOCK, try again next time */
410 /* call the callback first, so that we'll get a 0-count call to indicate
411 * EOF when the server closes the data connection
414 ftp->dproc(ftp, ftp->drecv, rd, ftp->dproc_cls);
418 closesocket(ftp->data);
426 static int respcode(const char *resp)
428 if(!isdigit(resp[0]) || !isdigit(resp[1]) || !isdigit(resp[2])) {
432 if(isspace(resp[3])) {
441 static void proc_control(struct ftp *ftp, const char *buf)
446 while(*buf && isspace(*buf)) buf++;
447 if((end = strchr(buf, '\r'))) {
451 infomsg("recv: %s\n", buf);
453 if((code = respcode(buf)) == 0) {
454 warnmsg("ignoring invalid response: %s\n", buf);
458 return; /* ignore continuations for now */
461 ftp->last_resp = code;
464 if(ftp->cproc(ftp, code, buf, ftp->cproc_cls) <= 0) {
468 /* execute next operation if there's one queued */
477 sendcmd(ftp, "user %s", ftp->user ? ftp->user : "anonymous");
480 sendcmd(ftp, "pass %s", ftp->pass ? ftp->pass : "foobar");
483 infomsg("login successful\n");
484 if(newconn(ftp) == -1) {
490 errmsg("login failed\n");
495 static int newconn(struct ftp *ftp)
497 if(ftp_active(ftp) == -1) {
500 ftp_queue(ftp, FTP_PWD, 0);
501 ftp_queue(ftp, FTP_LIST, 0);
505 int ftp_update(struct ftp *ftp)
510 int ftp_pwd(struct ftp *ftp)
513 ftp->cproc = cproc_pwd;
517 int ftp_chdir(struct ftp *ftp, const char *dirname)
519 sendcmd(ftp, "cwd %s", dirname);
520 ftp->cproc = cproc_cwd;
524 int ftp_mkdir(struct ftp *ftp, const char *dirname)
529 int ftp_rmdir(struct ftp *ftp, const char *dirname)
534 int ftp_delete(struct ftp *ftp, const char *fname)
544 int ftp_list(struct ftp *ftp)
546 struct recvbuf *rbuf;
548 if(!(rbuf = malloc(sizeof *rbuf))) {
549 errmsg("failed to allocate receive buffer\n");
554 if(!(rbuf->buf = malloc(rbuf->bufsz))) {
556 errmsg("failed to allocate receive buffer\n");
560 sendcmd(ftp, "list");
561 ftp->cproc = cproc_list;
562 ftp->dproc = dproc_list;
563 ftp->cproc_cls = ftp->dproc_cls = rbuf;
567 int ftp_retrieve(struct ftp *ftp, const char *fname)
572 int ftp_store(struct ftp *ftp, const char *fname)
577 static int get_quoted_text(const char *str, char *buf)
580 const char *src, *end;
582 if(!(src = strchr(str, '"'))) {
587 while(*end && *end != '"') end++;
591 memcpy(buf, src, len);
596 static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls)
599 errmsg("ftp_active failed\n");
602 ftp->status = FTP_CONN_ACT;
607 static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls)
612 warnmsg("pwd failed\n");
616 dirname = alloca(strlen(buf) + 1);
617 if(get_quoted_text(buf, dirname) == -1) {
618 warnmsg("pwd: invalid response: %s\n", buf);
622 free(ftp->curdir_rem);
623 ftp->curdir_rem = strdup_nf(dirname);
628 static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls)
633 static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls)
641 errmsg("failed to retrieve directory listing\n");
646 static void free_dirlist(struct ftp_dirent *list)
648 struct ftp_dirent *tmp;
659 #define SKIP_FIELD(p) \
661 while(*(p) && *(p) != '\n' && !isspace(*(p))) (p)++; \
662 while(*(p) && *(p) != '\n' && isspace(*(p))) (p)++; \
665 static int parse_dirent(struct ftp_dirent *ent, const char *line)
668 const char *ptr = line;
671 if(!(end = strchr(line, '\r')) && !(end = strchr(line, '\n'))) {
678 ent->type = FTP_FILE;
681 SKIP_FIELD(ptr); /* skip mode */
682 SKIP_FIELD(ptr); /* skip links */
683 SKIP_FIELD(ptr); /* skip owner */
684 SKIP_FIELD(ptr); /* skip group */
686 if(ent->type == FTP_FILE) {
687 ent->size = atoi(ptr);
689 SKIP_FIELD(ptr); /* skip size */
690 SKIP_FIELD(ptr); /* skip month */
691 SKIP_FIELD(ptr); /* skip day */
692 SKIP_FIELD(ptr); /* skip year */
694 if(ptr >= end) return -1;
697 ent->name = malloc(len + 1);
698 memcpy(ent->name, ptr, len);
704 static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls)
706 struct recvbuf *rbuf = cls;
709 /* EOF condition, we got the whole list, update directory entries */
710 char *ptr = rbuf->buf;
711 char *end = rbuf->buf + rbuf->size;
712 struct ftp_dirent *tail = 0;
713 struct ftp_dirent *ent;
715 free_dirlist(ftp->dent_rem);
719 ent = malloc_nf(sizeof *ent);
720 if(parse_dirent(ent, ptr) != -1) {
723 ftp->dent_rem = tail = ent;
729 while(ptr < end && *ptr != '\n' && *ptr != '\r') ptr++;
730 while(ptr < end && (*ptr == '\r' || *ptr == '\n')) ptr++;
732 ftp->modified |= FTP_MOD_REMDIR;
740 if(rbuf->size + sz > rbuf->bufsz) {
742 int newsz = rbuf->bufsz << 1;
744 if(!(tmp = realloc(rbuf->buf, newsz))) {
745 errmsg("failed to resize receive buffer\n");
752 memcpy(rbuf->buf + rbuf->size, buf, sz);