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/*
* wpa_supplicant/hostapd control interface library
* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#ifndef CONFIG_NATIVE_WINDOWS
#include <sys/socket.h>
#include <sys/un.h>
#endif /* CONFIG_NATIVE_WINDOWS */
#include "wpa_ctrl.h"
#ifdef CONFIG_NATIVE_WINDOWS
#include "common.h"
#endif /* CONFIG_NATIVE_WINDOWS */
/**
* struct wpa_ctrl - Internal structure for control interface library
*
* This structure is used by the wpa_supplicant/hostapd control interface
* library to store internal data. Programs using the library should not touch
* this data directly. They can only use the pointer to the data structure as
* an identifier for the control interface connection and use this as one of
* the arguments for most of the control interface library functions.
*/
struct wpa_ctrl {
int s;
#ifdef CONFIG_CTRL_IFACE_UDP
struct sockaddr_in local;
struct sockaddr_in dest;
#else /* CONFIG_CTRL_IFACE_UDP */
struct sockaddr_un local;
struct sockaddr_un dest;
#endif /* CONFIG_CTRL_IFACE_UDP */
};
struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
struct wpa_ctrl *ctrl;
#ifndef CONFIG_CTRL_IFACE_UDP
static int counter = 0;
#endif /* CONFIG_CTRL_IFACE_UDP */
ctrl = malloc(sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
memset(ctrl, 0, sizeof(*ctrl));
#ifdef CONFIG_CTRL_IFACE_UDP
ctrl->s = socket(PF_INET, SOCK_DGRAM, 0);
if (ctrl->s < 0) {
perror("socket");
free(ctrl);
return NULL;
}
ctrl->local.sin_family = AF_INET;
ctrl->local.sin_addr.s_addr = htonl((127 << 24) | 1);
if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
sizeof(ctrl->local)) < 0) {
close(ctrl->s);
free(ctrl);
return NULL;
}
ctrl->dest.sin_family = AF_INET;
ctrl->dest.sin_addr.s_addr = htonl((127 << 24) | 1);
ctrl->dest.sin_port = htons(9877);
if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
sizeof(ctrl->dest)) < 0) {
perror("connect");
close(ctrl->s);
free(ctrl);
return NULL;
}
#else /* CONFIG_CTRL_IFACE_UDP */
ctrl->s = socket(PF_UNIX, SOCK_DGRAM, 0);
if (ctrl->s < 0) {
free(ctrl);
return NULL;
}
ctrl->local.sun_family = AF_UNIX;
snprintf(ctrl->local.sun_path, sizeof(ctrl->local.sun_path),
"/tmp/wpa_ctrl_%d-%d", getpid(), counter++);
if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
sizeof(ctrl->local)) < 0) {
close(ctrl->s);
free(ctrl);
return NULL;
}
ctrl->dest.sun_family = AF_UNIX;
snprintf(ctrl->dest.sun_path, sizeof(ctrl->dest.sun_path), "%s",
ctrl_path);
if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
sizeof(ctrl->dest)) < 0) {
close(ctrl->s);
unlink(ctrl->local.sun_path);
free(ctrl);
return NULL;
}
#endif /* CONFIG_CTRL_IFACE_UDP */
return ctrl;
}
void wpa_ctrl_close(struct wpa_ctrl *ctrl)
{
#ifndef CONFIG_CTRL_IFACE_UDP
unlink(ctrl->local.sun_path);
#endif /* CONFIG_CTRL_IFACE_UDP */
close(ctrl->s);
free(ctrl);
}
int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
char *reply, size_t *reply_len,
void (*msg_cb)(char *msg, size_t len))
{
struct timeval tv;
int res;
fd_set rfds;
if (send(ctrl->s, cmd, cmd_len, 0) < 0)
return -1;
for (;;) {
tv.tv_sec = 2;
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_SET(ctrl->s, &rfds);
res = select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
if (FD_ISSET(ctrl->s, &rfds)) {
res = recv(ctrl->s, reply, *reply_len, 0);
if (res < 0)
return res;
if (res > 0 && reply[0] == '<') {
/* This is an unsolicited message from
* wpa_supplicant, not the reply to the
* request. Use msg_cb to report this to the
* caller. */
if (msg_cb) {
/* Make sure the message is nul
* terminated. */
if ((size_t) res == *reply_len)
res = (*reply_len) - 1;
reply[res] = '\0';
msg_cb(reply, res);
}
continue;
}
*reply_len = res;
break;
} else {
return -2;
}
}
return 0;
}
static int wpa_ctrl_attach_helper(struct wpa_ctrl *ctrl, int attach)
{
char buf[10];
int ret;
size_t len = 10;
ret = wpa_ctrl_request(ctrl, attach ? "ATTACH" : "DETACH", 6,
buf, &len, NULL);
if (ret < 0)
return ret;
if (len == 3 && memcmp(buf, "OK\n", 3) == 0)
return 0;
return -1;
}
int wpa_ctrl_attach(struct wpa_ctrl *ctrl)
{
return wpa_ctrl_attach_helper(ctrl, 1);
}
int wpa_ctrl_detach(struct wpa_ctrl *ctrl)
{
return wpa_ctrl_attach_helper(ctrl, 0);
}
int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
{
int res;
res = recv(ctrl->s, reply, *reply_len, 0);
if (res < 0)
return res;
*reply_len = res;
return 0;
}
int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
{
struct timeval tv;
int res;
fd_set rfds;
tv.tv_sec = 0;
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_SET(ctrl->s, &rfds);
res = select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
return FD_ISSET(ctrl->s, &rfds);
}
int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
{
return ctrl->s;
}
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