From 7e81417530acd05125a485b7d586b0b322e26706 Mon Sep 17 00:00:00 2001 From: Guillaume Nault Date: Thu, 12 Jul 2012 15:22:27 +0200 Subject: L2TP: Check for fcntl() errors in l2tp_connect() Add error detection to ensure the FD_CLOEXEC flag gets set for every new socket. Signed-off-by: Guillaume Nault --- accel-pppd/ctrl/l2tp/l2tp.c | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) (limited to 'accel-pppd/ctrl') diff --git a/accel-pppd/ctrl/l2tp/l2tp.c b/accel-pppd/ctrl/l2tp/l2tp.c index 469492d..fa76048 100644 --- a/accel-pppd/ctrl/l2tp/l2tp.c +++ b/accel-pppd/ctrl/l2tp/l2tp.c @@ -374,6 +374,7 @@ static int l2tp_connect(struct l2tp_conn_t *conn) { struct sockaddr_pppol2tp pppox_addr; int arg = 1; + int flg; memset(&pppox_addr, 0, sizeof(pppox_addr)); pppox_addr.sa_family = AF_PPPOX; @@ -388,8 +389,17 @@ static int l2tp_connect(struct l2tp_conn_t *conn) log_ppp_error("l2tp: socket(AF_PPPOX): %s\n", strerror(errno)); goto out_err; } - - fcntl(conn->tunnel_fd, F_SETFD, fcntl(conn->tunnel_fd, F_GETFD) | FD_CLOEXEC); + + flg = fcntl(conn->tunnel_fd, F_GETFD); + if (flg < 0) { + log_ppp_error("l2tp: fcntl(F_GETFD): %s\n", strerror(errno)); + goto out_err; + } + flg = fcntl(conn->tunnel_fd, F_SETFD, flg | FD_CLOEXEC); + if (flg < 0) { + log_ppp_error("l2tp: fcntl(F_SETFD): %s\n", strerror(errno)); + goto out_err; + } conn->ppp.fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP); if (conn->ppp.fd < 0) { @@ -397,7 +407,16 @@ static int l2tp_connect(struct l2tp_conn_t *conn) goto out_err; } - fcntl(conn->ppp.fd, F_SETFD, fcntl(conn->ppp.fd, F_GETFD) | FD_CLOEXEC); + flg = fcntl(conn->ppp.fd, F_GETFD); + if (flg < 0) { + log_ppp_error("l2tp: fcntl(F_GETFD): %s\n", strerror(errno)); + goto out_err; + } + flg = fcntl(conn->ppp.fd, F_SETFD, flg | FD_CLOEXEC); + if (flg < 0) { + log_ppp_error("l2tp: fcntl(F_SETFD): %s\n", strerror(errno)); + goto out_err; + } if (connect(conn->tunnel_fd, (struct sockaddr *)&pppox_addr, sizeof(pppox_addr)) < 0) { log_ppp_error("l2tp: connect(tunnel): %s\n", strerror(errno)); @@ -418,7 +437,7 @@ static int l2tp_connect(struct l2tp_conn_t *conn) } conn->ppp.chan_name = _strdup(inet_ntoa(conn->addr.sin_addr)); - + triton_event_fire(EV_CTRL_STARTED, &conn->ppp); if (establish_ppp(&conn->ppp)) -- cgit v1.2.3