127 lines
3.4 KiB
Diff
127 lines
3.4 KiB
Diff
From: Aron Xu <aron@debian.org>
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Date: Mon, 13 Feb 2012 14:43:56 +0800
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Subject: connect timeout
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---
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netcat.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 76 insertions(+), 2 deletions(-)
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--- a/netcat.c
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+++ b/netcat.c
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@@ -90,6 +90,7 @@
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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+#include <fcntl.h>
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#include <limits.h>
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#include <netdb.h>
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#include <poll.h>
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@@ -124,6 +125,10 @@
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# define TLS_MUSTSTAPLE (1 << 4)
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#endif
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+#define CONNECTION_SUCCESS 0
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+#define CONNECTION_FAILED 1
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+#define CONNECTION_TIMEOUT 2
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+
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/* Command Line Options */
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int dflag; /* detached, no stdin */
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int Fflag; /* fdpass sock to stdout */
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@@ -214,6 +219,9 @@ ssize_t drainbuf(int, unsigned char *, s
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ssize_t fillbuf(int, unsigned char *, size_t *);
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# endif
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+static int connect_with_timeout(int fd, const struct sockaddr *sa,
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+ socklen_t salen, int ctimeout);
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+
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int
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main(int argc, char *argv[])
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{
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@@ -1078,11 +1086,14 @@ remote_connect(const char *host, const c
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set_common_sockopts(s, res->ai_family);
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- if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
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+ if ((error = connect_with_timeout(s, res->ai_addr, res->ai_addrlen, timeout)) == CONNECTION_SUCCESS)
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break;
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- if (vflag)
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+ if (vflag && error == CONNECTION_FAILED)
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warn("connect to %s port %s (%s) failed", host, port,
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uflag ? "udp" : "tcp");
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+ else if (vflag && error == CONNECTION_TIMEOUT)
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+ warn("connect to %s port %s (%s) timed out", host, port,
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+ uflag ? "udp" : "tcp");
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save_errno = errno;
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close(s);
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@@ -1123,6 +1134,69 @@ timeout_connect(int s, const struct sock
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return ret;
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}
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+static int connect_with_timeout(int fd, const struct sockaddr *sa,
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+ socklen_t salen, int ctimeout)
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+{
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+ int err;
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+ struct timeval tv, *tvp = NULL;
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+ fd_set connect_fdset;
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+ socklen_t len;
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+ int orig_flags;
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+
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+ orig_flags = fcntl(fd, F_GETFL, 0);
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+ if (fcntl(fd, F_SETFL, orig_flags | O_NONBLOCK) < 0 ) {
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+ warn("can't set O_NONBLOCK - timeout not available");
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+ if (connect(fd, sa, salen) == 0)
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+ return CONNECTION_SUCCESS;
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+ else
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+ return CONNECTION_FAILED;
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+ }
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+
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+ /* set connect timeout */
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+ if (ctimeout > 0) {
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+ tv.tv_sec = (time_t)ctimeout/1000;
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+ tv.tv_usec = 0;
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+ tvp = &tv;
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+ }
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+
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+ /* attempt the connection */
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+ err = connect(fd, sa, salen);
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+ if (err != 0 && errno == EINPROGRESS) {
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+ /* connection is proceeding
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+ * it is complete (or failed) when select returns */
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+
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+ /* initialize connect_fdset */
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+ FD_ZERO(&connect_fdset);
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+ FD_SET(fd, &connect_fdset);
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+
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+ /* call select */
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+ do {
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+ err = select(fd + 1, NULL, &connect_fdset,
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+ NULL, tvp);
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+ } while (err < 0 && errno == EINTR);
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+
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+ /* select error */
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+ if (err < 0)
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+ errx(1,"select error: %s", strerror(errno));
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+ /* we have reached a timeout */
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+ if (err == 0)
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+ return CONNECTION_TIMEOUT;
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+ /* select returned successfully, but we must test socket
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+ * error for result */
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+ len = sizeof(err);
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+ if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len) < 0)
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+ errx(1, "getsockopt error: %s", strerror(errno));
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+ /* setup errno according to the result returned by
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+ * getsockopt */
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+ if (err != 0)
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+ errno = err;
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+ }
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+
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+ /* return aborted if an error occured, and valid otherwise */
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+ fcntl(fd, F_SETFL, orig_flags);
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+ return (err != 0)? CONNECTION_FAILED : CONNECTION_SUCCESS;
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+}
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+
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/*
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* local_listen()
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* Returns a socket listening on a local port, binds to specified source
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