#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <stdarg.h>
#include <errno.h>
+#include <ctype.h>
+#include <time.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define fcntlsocket fcntl
#endif
+#define TIMEOUT 15
+
+static int newconn(struct ftp *ftp);
+static int sendcmd(struct ftp *ftp, const char *fmt, ...);
static int handle_control(struct ftp *ftp);
static int handle_data(struct ftp *ftp, int s);
static void proc_control(struct ftp *ftp, const char *buf);
+static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls);
+static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls);
+static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls);
+
+static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls);
+static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls);
+
+
struct ftp *ftp_alloc(void)
{
struct ftp *ftp;
if(!(ftp = calloc(1, sizeof *ftp))) {
return 0;
}
- ftp->ctl = ftp->data = -1;
+ ftp->ctl = ftp->data = ftp->lis = -1;
return ftp;
}
ftp->ctl = -1;
ftp->num_crecv = 0;
}
+ if(ftp->lis >= 0) {
+ closesocket(ftp->lis);
+ ftp->lis = -1;
+ }
if(ftp->data >= 0) {
closesocket(ftp->data);
ftp->data = -1;
- ftp->num_drecv = 0;
}
}
int ftp_sockets(struct ftp *ftp, int *sockv, int maxsize)
{
- if(ftp->ctl >= 0 && maxsize) {
- *sockv++ = ftp->ctl;
- maxsize--;
+ int *sptr = sockv;
+ if(ftp->ctl >= 0 && maxsize-- > 0) {
+ *sptr++ = ftp->ctl;
+ }
+ if(ftp->lis >= 0 && maxsize-- > 0) {
+ *sptr++ = ftp->lis;
}
- return 1;
+ if(ftp->data >= 0 && maxsize-- > 0) {
+ *sptr++ = ftp->data;
+ }
+ return sptr - sockv;
}
-int ftp_pending(struct ftp *ftp)
+static void exec_op(struct ftp *ftp, int op, const char *arg)
+{
+ switch(op) {
+ case FTP_PWD:
+ ftp_pwd(ftp);
+ break;
+
+ case FTP_CHDIR:
+ ftp_chdir(ftp, arg);
+ break;
+
+ case FTP_MKDIR:
+ ftp_mkdir(ftp, arg);
+ break;
+
+ case FTP_RMDIR:
+ ftp_rmdir(ftp, arg);
+ break;
+
+ case FTP_DEL:
+ ftp_delete(ftp, arg);
+ break;
+
+ case FTP_LIST:
+ ftp_list(ftp);
+ break;
+
+ case FTP_RETR:
+ ftp_retrieve(ftp, arg);
+ break;
+
+ case FTP_STORE:
+ ftp_store(ftp, arg);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void exec_queued(struct ftp *ftp)
+{
+ struct ftp_op *fop;
+
+ if(!(fop = ftp->qhead)) {
+ return;
+ }
+
+ if(ftp->qtail == fop) {
+ ftp->qhead = ftp->qtail = 0;
+ } else {
+ ftp->qhead = ftp->qhead->next;
+ }
+
+ exec_op(ftp, fop->op, fop->arg);
+
+ free(fop->arg);
+ free(fop);
+}
+
+
+int ftp_queue(struct ftp *ftp, int op, const char *arg)
+{
+ struct ftp_op *fop;
+
+ if(!ftp->busy && !ftp->qhead) {
+ exec_op(ftp, op, arg);
+ return 0;
+ }
+
+ if(!(fop = malloc(sizeof *fop))) {
+ return -1;
+ }
+ if(arg) {
+ if(!(fop->arg = strdup(arg))) {
+ free(fop);
+ return -1;
+ }
+ } else {
+ fop->arg = 0;
+ }
+ fop->op = op;
+ fop->next = 0;
+
+ if(ftp->qhead) {
+ ftp->qtail->next = fop;
+ ftp->qtail = fop;
+ } else {
+ ftp->qhead = ftp->qtail = fop;
+ }
+ return 0;
+}
+
+int ftp_waitresp(struct ftp *ftp, time_t timeout)
{
- int maxfd = -1;
fd_set rdset;
- struct timeval tv = {0, 0};
+ struct timeval tv;
+ time_t start;
- FD_ZERO(&rdset);
- if(ftp->ctl >= 0) {
+ ftp->last_resp = -1;
+ start = time(0);
+
+ for(;;) {
+ FD_ZERO(&rdset);
FD_SET(ftp->ctl, &rdset);
- maxfd = ftp->ctl;
+
+ if(timeout >= 0) {
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+ }
+
+ if(select(ftp->ctl + 1, &rdset, 0, 0, timeout >= 0 ? &tv : 0) == -1 && errno == EINTR) {
+ continue;
+ }
+
+ if(FD_ISSET(ftp->ctl, &rdset)) {
+ ftp->last_resp = -1;
+ ftp_handle(ftp, ftp->ctl);
+ if(ftp->last_resp) {
+ break;
+ }
+ }
+
+ if(timeout > 0) {
+ timeout -= time(0) - start;
+ if(timeout <= 0) {
+ return -1;
+ }
+ }
+
+ }
+ return ftp->last_resp;
+}
+
+static int ftp_active(struct ftp *ftp)
+{
+ struct sockaddr_in sa = {0};
+ socklen_t len;
+ unsigned long addr;
+ unsigned short port;
+
+ if(ftp->lis >= 0) {
+ closesocket(ftp->lis);
}
if(ftp->data >= 0) {
- FD_SET(ftp->data, &rdset);
- if(ftp->data > maxfd) maxfd = ftp->data;
+ closesocket(ftp->data);
+ ftp->data = -1;
+ }
+
+ if((ftp->lis = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
+ errmsg("ftp_active: failed to create listening socket\n");
+ return -1;
+ }
+
+ len = sizeof sa;
+ getsockname(ftp->ctl, (struct sockaddr*)&sa, &len);
+
+ sa.sin_family = AF_INET;
+ sa.sin_port = 0;
+
+ if(bind(ftp->lis, (struct sockaddr*)&sa, sizeof sa) == -1) {
+ errmsg("ftp_active: failed to bind listening socket\n");
+ closesocket(ftp->lis);
+ ftp->lis = -1;
+ return -1;
+ }
+ listen(ftp->lis, 1);
+
+ len = sizeof sa;
+ if(getsockname(ftp->lis, (struct sockaddr*)&sa, &len) == -1) {
+ errmsg("ftp_active: failed to retrieve listening socket address\n");
+ closesocket(ftp->lis);
+ ftp->lis = -1;
+ return -1;
}
- if(maxfd == -1) return 0;
- return select(maxfd + 1, &rdset, 0, 0, &tv) > 0 ? 1 : 0;
+ addr = ntohl(sa.sin_addr.s_addr);
+ port = ntohs(sa.sin_port);
+ infomsg("listening on %s port %d\n", inet_ntoa(sa.sin_addr), port);
+
+ sendcmd(ftp, "PORT %d,%d,%d,%d,%d,%d", addr >> 24, (addr >> 16) & 0xff,
+ (addr >> 8) & 0xff, addr & 0xff, port >> 8, port & 0xff);
+
+ ftp->cproc = cproc_active;
+ return 0;
}
int ftp_handle(struct ftp *ftp, int s)
if(s == ftp->data) {
return handle_data(ftp, s);
}
+ if(s == ftp->lis) {
+ int ns = accept(s, 0, 0);
+ if(ftp->data >= 0) {
+ closesocket(ns);
+ } else {
+ ftp->data = ns;
+ }
+ return 0;
+ }
return -1;
}
+static int sendcmd(struct ftp *ftp, const char *fmt, ...)
+{
+ char buf[256];
+ va_list ap;
+
+ if(ftp->ctl < 0) {
+ return -1;
+ }
+
+ ftp->busy = 1;
+
+ va_start(ap, fmt);
+ vsprintf(buf, fmt, ap);
+ va_end(ap);
+ infomsg("send: %s\n", buf);
+ strcat(buf, "\r\n");
+ return send(ftp->ctl, buf, strlen(buf), 0);
+}
+
static int handle_control(struct ftp *ftp)
{
int i, sz, rd;
static int handle_data(struct ftp *ftp, int s)
{
- return -1;
+ int rd;
+
+ if(ftp->data == -1) {
+ return -1;
+ }
+
+ for(;;) {
+ if((rd = recv(ftp->data, ftp->drecv, sizeof ftp->drecv, 0)) == -1) {
+ if(errno == EINTR) continue;
+ /* assume EWOULDBLOCK, try again next time */
+ break;
+ }
+
+ /* call the callback first, so that we'll get a 0-count call to indicate
+ * EOF when the server closes the data connection
+ */
+ if(ftp->dproc) {
+ ftp->dproc(ftp, ftp->drecv, rd, ftp->dproc_cls);
+ }
+
+ if(rd == 0) {
+ closesocket(ftp->data);
+ ftp->data = -1;
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int respcode(const char *resp)
+{
+ if(!isdigit(resp[0]) || !isdigit(resp[1]) || !isdigit(resp[2])) {
+ return 0;
+ }
+
+ if(isspace(resp[3])) {
+ return atoi(resp);
+ }
+ if(resp[3] == '-') {
+ return -atoi(resp);
+ }
+ return 0;
}
static void proc_control(struct ftp *ftp, const char *buf)
{
+ int code;
+ char *end;
+
+ while(*buf && isspace(*buf)) buf++;
+ if((end = strchr(buf, '\r'))) {
+ *end = 0;
+ }
+
+ infomsg("recv: %s\n", buf);
+
+ if((code = respcode(buf)) == 0) {
+ warnmsg("ignoring invalid response: %s\n", buf);
+ return;
+ }
+ if(code < 0) {
+ return; /* ignore continuations for now */
+ }
+
+ ftp->last_resp = code;
+
+ if(ftp->cproc) {
+ if(ftp->cproc(ftp, code, buf, ftp->cproc_cls) <= 0) {
+ ftp->cproc = 0;
+ ftp->busy = 0;
+
+ /* execute next operation if there's one queued */
+ exec_queued(ftp);
+ }
+ return;
+ }
+
+ switch(code) {
+ case 220:
+ sendcmd(ftp, "user %s", ftp->user ? ftp->user : "anonymous");
+ break;
+ case 331:
+ sendcmd(ftp, "pass %s", ftp->pass ? ftp->pass : "foobar");
+ break;
+ case 230:
+ infomsg("login successful\n");
+ if(newconn(ftp) == -1) {
+ ftp_close(ftp);
+ }
+ break;
+ case 530:
+ ftp->status = 0;
+ errmsg("login failed\n");
+ break;
+ }
+ ftp->busy = 0;
+}
+
+static int newconn(struct ftp *ftp)
+{
+ if(ftp_active(ftp) == -1) {
+ return -1;
+ }
+ ftp_queue(ftp, FTP_PWD, 0);
+ ftp_queue(ftp, FTP_LIST, 0);
+ return 0;
}
int ftp_update(struct ftp *ftp)
return -1;
}
+int ftp_pwd(struct ftp *ftp)
+{
+ sendcmd(ftp, "pwd");
+ ftp->cproc = cproc_pwd;
+ return 0;
+}
+
int ftp_chdir(struct ftp *ftp, const char *dirname)
{
+ sendcmd(ftp, "cwd %s", dirname);
+ ftp->cproc = cproc_cwd;
+ return 0;
+}
+
+int ftp_mkdir(struct ftp *ftp, const char *dirname)
+{
return -1;
}
+
+int ftp_rmdir(struct ftp *ftp, const char *dirname)
+{
+ return -1;
+}
+
+int ftp_delete(struct ftp *ftp, const char *fname)
+{
+ return -1;
+}
+
+struct recvbuf {
+ char *buf;
+ long size, bufsz;
+};
+
+int ftp_list(struct ftp *ftp)
+{
+ struct recvbuf *rbuf;
+
+ if(!(rbuf = malloc(sizeof *rbuf))) {
+ errmsg("failed to allocate receive buffer\n");
+ return -1;
+ }
+ rbuf->size = 0;
+ rbuf->bufsz = 1024;
+ if(!(rbuf->buf = malloc(rbuf->bufsz))) {
+ free(rbuf);
+ errmsg("failed to allocate receive buffer\n");
+ return -1;
+ }
+
+ sendcmd(ftp, "list");
+ ftp->cproc = cproc_list;
+ ftp->dproc = dproc_list;
+ ftp->cproc_cls = ftp->dproc_cls = rbuf;
+ return 0;
+}
+
+int ftp_retrieve(struct ftp *ftp, const char *fname)
+{
+ return -1;
+}
+
+int ftp_store(struct ftp *ftp, const char *fname)
+{
+ return -1;
+}
+
+static int get_quoted_text(const char *str, char *buf)
+{
+ int len;
+ const char *src, *end;
+
+ if(!(src = strchr(str, '"'))) {
+ return -1;
+ }
+ src++;
+ end = src;
+ while(*end && *end != '"') end++;
+ if(!*end) return -1;
+
+ len = end - src;
+ memcpy(buf, src, len);
+ buf[len] = 0;
+ return 0;
+}
+
+static int cproc_active(struct ftp *ftp, int code, const char *buf, void *cls)
+{
+ if(code != 200) {
+ errmsg("ftp_active failed\n");
+ ftp_close(ftp);
+ } else {
+ ftp->status = FTP_CONN_ACT;
+ }
+ return 0;
+}
+
+static int cproc_pwd(struct ftp *ftp, int code, const char *buf, void *cls)
+{
+ char *dirname;
+
+ if(code != 257) {
+ warnmsg("pwd failed\n");
+ return -1;
+ }
+
+ dirname = alloca(strlen(buf) + 1);
+ if(get_quoted_text(buf, dirname) == -1) {
+ warnmsg("pwd: invalid response: %s\n", buf);
+ return -1;
+ }
+
+ free(ftp->curdir_rem);
+ ftp->curdir_rem = strdup_nf(dirname);
+ ftp->modified = 1;
+ return 0;
+}
+
+static int cproc_cwd(struct ftp *ftp, int code, const char *buf, void *cls)
+{
+ return -1;
+}
+
+static int cproc_list(struct ftp *ftp, int code, const char *buf, void *cls)
+{
+ if(code < 200) {
+ /* expect more */
+ return 1;
+ }
+
+ if(code >= 400) {
+ errmsg("failed to retrieve directory listing\n");
+ }
+ return 0;
+}
+
+static void free_dirlist(struct ftp_dirent *list)
+{
+ struct ftp_dirent *tmp;
+
+ while(list) {
+ tmp = list;
+ list = list->next;
+
+ free(tmp->name);
+ free(tmp);
+ }
+}
+
+#define SKIP_FIELD(p) \
+ do { \
+ while(*(p) && *(p) != '\n' && !isspace(*(p))) (p)++; \
+ while(*(p) && *(p) != '\n' && isspace(*(p))) (p)++; \
+ } while(0)
+
+static int parse_dirent(struct ftp_dirent *ent, const char *line)
+{
+ int len;
+ const char *ptr = line;
+ const char *end;
+
+ if(!(end = strchr(line, '\r')) && !(end = strchr(line, '\n'))) {
+ return -1;
+ }
+
+ if(line[0] == 'd') {
+ ent->type = FTP_DIR;
+ } else {
+ ent->type = FTP_FILE;
+ }
+
+ SKIP_FIELD(ptr); /* skip mode */
+ SKIP_FIELD(ptr); /* skip links */
+ SKIP_FIELD(ptr); /* skip owner */
+ SKIP_FIELD(ptr); /* skip group */
+
+ if(ent->type == FTP_FILE) {
+ ent->size = atoi(ptr);
+ }
+ SKIP_FIELD(ptr); /* skip size */
+ SKIP_FIELD(ptr); /* skip month */
+ SKIP_FIELD(ptr); /* skip day */
+ SKIP_FIELD(ptr); /* skip year */
+
+ if(ptr >= end) return -1;
+
+ len = end - ptr;
+ ent->name = malloc(len + 1);
+ memcpy(ent->name, ptr, len);
+ ent->name[len] = 0;
+
+ return 0;
+}
+
+static void dproc_list(struct ftp *ftp, const char *buf, int sz, void *cls)
+{
+ struct recvbuf *rbuf = cls;
+
+ if(sz == 0) {
+ /* EOF condition, we got the whole list, update directory entries */
+ char *ptr = rbuf->buf;
+ char *end = rbuf->buf + rbuf->size;
+ struct ftp_dirent *tail = 0;
+ struct ftp_dirent *ent;
+
+ free_dirlist(ftp->dent_rem);
+ ftp->dent_rem = 0;
+
+ while(ptr < end) {
+ ent = malloc_nf(sizeof *ent);
+ if(parse_dirent(ent, ptr) != -1) {
+ ent->next = 0;
+ if(!tail) {
+ ftp->dent_rem = tail = ent;
+ } else {
+ tail->next = ent;
+ tail = ent;
+ }
+ }
+ while(ptr < end && *ptr != '\n' && *ptr != '\r') ptr++;
+ while(ptr < end && (*ptr == '\r' || *ptr == '\n')) ptr++;
+ }
+ ftp->modified |= FTP_MOD_REMDIR;
+
+ free(rbuf->buf);
+ free(rbuf);
+ ftp->dproc = 0;
+ return;
+ }
+
+ if(rbuf->size + sz > rbuf->bufsz) {
+ char *tmp;
+ int newsz = rbuf->bufsz << 1;
+
+ if(!(tmp = realloc(rbuf->buf, newsz))) {
+ errmsg("failed to resize receive buffer\n");
+ return;
+ }
+ rbuf->buf = tmp;
+ rbuf->bufsz = newsz;
+ }
+
+ memcpy(rbuf->buf + rbuf->size, buf, sz);
+ rbuf->size += sz;
+}
projects / oftp / blobdiff