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Make UNIX socket non-blocking for ctrl_iface

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This keeps wpa_cli from hanging forever if the other end of the socket
dies.

Signed-hostap: Ben Greear <greearb@candelatech.com>
This commit is contained in:
Ben Greear 2012-08-04 20:34:27 +03:00 committed by Jouni Malinen
parent c8b245b6a4
commit 4fdc8def88
2 changed files with 57 additions and 0 deletions
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40
src/common/wpa_ctrl.c
View file

@ -12,6 +12,8 @@
#ifdef CONFIG_CTRL_IFACE_UNIX
#include <sys/un.h>
#include <unistd.h>
#include <fcntl.h>
#endif /* CONFIG_CTRL_IFACE_UNIX */
#ifdef ANDROID
@ -73,6 +75,7 @@ struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
int ret;
size_t res;
int tries = 0;
int flags;
ctrl = os_malloc(sizeof(*ctrl));
if (ctrl == NULL)
@ -156,6 +159,19 @@ try_again:
return NULL;
}
/*
* Make socket non-blocking so that we don't hang forever if
* target dies unexpectedly.
*/
flags = fcntl(ctrl->s, F_GETFL);
if (flags >= 0) {
flags |= O_NONBLOCK;
if (fcntl(ctrl->s, F_SETFL, flags) < 0) {
perror("fcntl(ctrl->s, O_NONBLOCK)");
/* Not fatal, continue on.*/
}
}
return ctrl;
}
@ -289,6 +305,7 @@ int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
void (*msg_cb)(char *msg, size_t len))
{
struct timeval tv;
struct os_time started_at;
int res;
fd_set rfds;
const char *_cmd;
@ -315,7 +332,30 @@ int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
_cmd_len = cmd_len;
}
errno = 0;
started_at.sec = 0;
started_at.usec = 0;
retry_send:
if (send(ctrl->s, _cmd, _cmd_len, 0) < 0) {
if (errno == EAGAIN || errno == EBUSY || errno == EWOULDBLOCK)
{
/*
* Must be a non-blocking socket... Try for a bit
* longer before giving up.
*/
if (started_at.sec == 0)
os_get_time(&started_at);
else {
struct os_time n;
os_get_time(&n);
/* Try for a few seconds. */
if (n.sec > started_at.sec + 5)
goto send_err;
}
os_sleep(1, 0);
goto retry_send;
}
send_err:
os_free(cmd_buf);
return -1;
}

17
wpa_supplicant/ctrl_iface_unix.c
View file

@ -11,6 +11,8 @@
#include <sys/stat.h>
#include <grp.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef ANDROID
#include <cutils/sockets.h>
#endif /* ANDROID */
@ -259,6 +261,7 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
char *buf, *dir = NULL, *gid_str = NULL;
struct group *grp;
char *endp;
int flags;
priv = os_zalloc(sizeof(*priv));
if (priv == NULL)
@ -405,6 +408,20 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
#ifdef ANDROID
havesock:
#endif /* ANDROID */
/*
* Make socket non-blocking so that we don't hang forever if
* target dies unexpectedly.
*/
flags = fcntl(priv->sock, F_GETFL);
if (flags >= 0) {
flags |= O_NONBLOCK;
if (fcntl(priv->sock, F_SETFL, flags) < 0) {
perror("fcntl(ctrl, O_NONBLOCK)");
/* Not fatal, continue on.*/
}
}
eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
wpa_s, priv);
wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);