X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fftp.c;h=6a29a776bb10e85b070b65cc598b40beb639bbf4;hb=a606b2eade34c3d8e662e94a32af960b5d2911f1;hp=59bc284cd303cb87654e7ab74c9d37bc67eef875;hpb=4577dd26b3ecbf7ccc5ff55efa991334136866e1;p=oftp

diff --git a/src/ftp.c b/src/ftp.c
index 59bc284..6a29a77 100644
--- a/src/ftp.c
+++ b/src/ftp.c
@@ -1,7 +1,10 @@
 #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>
@@ -17,10 +20,22 @@
 #define fcntlsocket		fcntl
 #endif
 
+#define TIMEOUT	5
+
+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;
@@ -28,7 +43,7 @@ struct ftp *ftp_alloc(void)
 	if(!(ftp = calloc(1, sizeof *ftp))) {
 		return 0;
 	}
-	ftp->ctl = ftp->data = -1;
+	ftp->ctl = ftp->data = ftp->lis = -1;
 	return ftp;
 }
 
@@ -82,40 +97,205 @@ void ftp_close(struct ftp *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;
+	}
+	if(ftp->data >= 0 && maxsize-- > 0) {
+		*sptr++ = ftp->data;
 	}
-	return 1;
+	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->qhead) {
+		exec_op(ftp, op, arg);
+		return 0;
+	}
+
+	if(!(fop = malloc(sizeof *fop))) {
+		return -1;
+	}
+	if(!(fop->arg = strdup(arg))) {
+		free(fop);
+		return -1;
+	}
+	fop->op = op;
+	fop->next = 0;
+
+	ftp->qtail->next = fop;
+	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(maxfd == -1) return 0;
 
-	return select(maxfd + 1, &rdset, 0, 0, &tv) > 0 ? 1 : 0;
+	if((ftp->lis = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
+		errmsg("ftp_active: failed to create listening socket\n");
+		return -1;
+	}
+
+	sa.sin_family = AF_INET;
+	sa.sin_port = 0;
+	sa.sin_addr.s_addr = htonl(INADDR_ANY);
+
+	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->ctl, (struct sockaddr*)&sa, &len) == -1) {
+		errmsg("ftp_active: failed to retrieve listening socket address\n");
+		closesocket(ftp->lis);
+		ftp->lis = -1;
+		return -1;
+	}
+
+	addr = ntohl(sa.sin_addr.s_addr);
+	port = ntohs(sa.sin_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)
@@ -126,9 +306,35 @@ 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;
+	}
+
+	va_start(ap, fmt);
+	vsprintf(buf, fmt, ap);
+	va_end(ap);
+	strcat(buf, "\r\n");
+
+	return send(ftp->ctl, buf, strlen(buf), 0);
+}
+
 static int handle_control(struct ftp *ftp)
 {
 	int i, sz, rd;
@@ -165,11 +371,104 @@ static int handle_control(struct ftp *ftp)
 
 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;
+
+	while(*buf && isspace(*buf)) 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;
+
+			/* 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;
+	}
+}
+
+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)
@@ -177,7 +476,170 @@ 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 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 */
+		/* TODO */
+		rbuf->buf[rbuf->size] = 0;
+		fprintf(stderr, "%s\n", rbuf->buf);
+
+		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;
+}