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;
356 while((sz = sizeof ftp->crecv - ftp->num_crecv) > 0) {
357 start = ftp->crecv + ftp->num_crecv;
358 if((rd = recv(ftp->ctl, start, sz, 0)) == -1) {
359 if(errno == EINTR) continue;
360 /* assume EWOULDBLOCK, try again next time */
370 for(i=0; i<rd; i++) {
371 if(start[i] == '\n') {
373 proc_control(ftp, buf);
377 if(buf != ftp->crecv && buf < end) {
378 ftp->num_crecv = end - buf;
379 memmove(ftp->crecv, buf, ftp->num_crecv);
385 static int handle_data(struct ftp *ftp, int s)
389 if(ftp->data == -1) {
394 if((rd = recv(ftp->data, ftp->drecv, sizeof ftp->drecv, 0)) == -1) {
395 if(errno == EINTR) continue;
396 /* assume EWOULDBLOCK, try again next time */
400 /* call the callback first, so that we'll get a 0-count call to indicate
401 * EOF when the server closes the data connection
404 ftp->dproc(ftp, ftp->drecv, rd, ftp->dproc_cls);
408 closesocket(ftp->data);
416 static int respcode(const char *resp)
418 if(!isdigit(resp[0]) || !isdigit(resp[1]) || !isdigit(resp[2])) {
422 if(isspace(resp[3])) {
431 static void proc_control(struct ftp *ftp, const char *buf)
436 while(*buf && isspace(*buf)) buf++;
437 if((end = strchr(buf, '\r'))) {
441 infomsg("recv: %s\n", buf);
443 if((code = respcode(buf)) == 0) {
444 warnmsg("ignoring invalid response: %s\n", buf);
448 return; /* ignore continuations for now */
451 ftp->last_resp = code;
454 if(ftp->cproc(ftp, code, buf, ftp->cproc_cls) <= 0) {
458 /* execute next operation if there's one queued */
466 sendcmd(ftp, "user %s", ftp->user ? ftp->user : "anonymous");
469 sendcmd(ftp, "pass %s", ftp->pass ? ftp->pass : "foobar");
472 infomsg("login successful\n");
473 if(newconn(ftp) == -1) {
479 errmsg("login failed\n");
485 static int newconn(struct ftp *ftp)
487 if(ftp_active(ftp) == -1) {
490 ftp_queue(ftp, FTP_PWD, 0);
491 ftp_queue(ftp, FTP_LIST, 0);
495 int ftp_update(struct ftp *ftp)
500 int ftp_pwd(struct ftp *ftp)
503 ftp->cproc = cproc_pwd;
507 int ftp_chdir(struct ftp *ftp, const char *dirname)
509 sendcmd(ftp, "cwd %s", dirname);
510 ftp->cproc = cproc_cwd;
514 int ftp_mkdir(struct ftp *ftp, const char *dirname)
519 int ftp_rmdir(struct ftp *ftp, const char *dirname)
524 int ftp_delete(struct ftp *ftp, const char *fname)
534 int ftp_list(struct ftp *ftp)
536 struct recvbuf *rbuf;
538 if(!(rbuf = malloc(sizeof *rbuf))) {
539 errmsg("failed to allocate receive buffer\n");
544 if(!(rbuf->buf = malloc(rbuf->bufsz))) {
546 errmsg("failed to allocate receive buffer\n");
550 sendcmd(ftp, "list");
551 ftp->cproc = cproc_list;
552 ftp->dproc = dproc_list;
553 ftp->cproc_cls = ftp->dproc_cls = rbuf;
557 int ftp_retrieve(struct ftp *ftp, const char *fname)
562 int ftp_store(struct ftp *ftp, const char *fname)
567 static int get_quoted_text(const char *str, char *buf)
570 const char *src, *end;
572 if(!(src = strchr(str, '"'))) {
577 while(*end && *end != '"') end++;
581 memcpy(buf, src, len);
586 static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls)
589 errmsg("ftp_active failed\n");
592 ftp->status = FTP_CONN_ACT;
597 static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls)
602 warnmsg("pwd failed\n");
606 dirname = alloca(strlen(buf) + 1);
607 if(get_quoted_text(buf, dirname) == -1) {
608 warnmsg("pwd: invalid response: %s\n", buf);
612 free(ftp->curdir_rem);
613 ftp->curdir_rem = strdup_nf(dirname);
618 static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls)
623 static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls)
631 errmsg("failed to retrieve directory listing\n");
636 static void free_dirlist(struct ftp_dirent *list)
638 struct ftp_dirent *tmp;
649 #define SKIP_FIELD(p) \
651 while(*(p) && *(p) != '\n' && !isspace(*(p))) (p)++; \
652 while(*(p) && *(p) != '\n' && isspace(*(p))) (p)++; \
655 static int parse_dirent(struct ftp_dirent *ent, const char *line)
658 const char *ptr = line;
661 if(!(end = strchr(line, '\r')) && !(end = strchr(line, '\n'))) {
668 ent->type = FTP_FILE;
671 SKIP_FIELD(ptr); /* skip mode */
672 SKIP_FIELD(ptr); /* skip links */
673 SKIP_FIELD(ptr); /* skip owner */
674 SKIP_FIELD(ptr); /* skip group */
676 if(ent->type == FTP_FILE) {
677 ent->size = atoi(ptr);
679 SKIP_FIELD(ptr); /* skip size */
680 SKIP_FIELD(ptr); /* skip month */
681 SKIP_FIELD(ptr); /* skip day */
682 SKIP_FIELD(ptr); /* skip year */
684 if(ptr >= end) return -1;
687 ent->name = malloc(len + 1);
688 memcpy(ent->name, ptr, len);
694 static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls)
696 struct recvbuf *rbuf = cls;
699 /* EOF condition, we got the whole list, update directory entries */
700 char *ptr = rbuf->buf;
701 char *end = rbuf->buf + rbuf->size;
702 struct ftp_dirent *tail = 0;
703 struct ftp_dirent *ent;
705 free_dirlist(ftp->dent_rem);
709 ent = malloc_nf(sizeof *ent);
710 if(parse_dirent(ent, ptr) != -1) {
713 ftp->dent_rem = tail = ent;
719 while(ptr < end && *ptr != '\n' && *ptr != '\r') ptr++;
720 while(ptr < end && (*ptr == '\r' || *ptr == '\n')) ptr++;
722 ftp->modified |= FTP_MOD_REMDIR;
730 if(rbuf->size + sz > rbuf->bufsz) {
732 int newsz = rbuf->bufsz << 1;
734 if(!(tmp = realloc(rbuf->buf, newsz))) {
735 errmsg("failed to resize receive buffer\n");
742 memcpy(rbuf->buf + rbuf->size, buf, sz);