freebsd-dev/contrib/hostapd/wpa_ctrl.c
2007-07-09 16:15:06 +00:00

426 lines
8.9 KiB
C

/*
* wpa_supplicant/hostapd control interface library
* Copyright (c) 2004-2007, Jouni Malinen <j@w1.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 "includes.h"
#ifdef CONFIG_CTRL_IFACE
#ifdef CONFIG_CTRL_IFACE_UNIX
#include <sys/un.h>
#endif /* CONFIG_CTRL_IFACE_UNIX */
#include "wpa_ctrl.h"
#include "common.h"
#if defined(CONFIG_CTRL_IFACE_UNIX) || defined(CONFIG_CTRL_IFACE_UDP)
#define CTRL_IFACE_SOCKET
#endif /* CONFIG_CTRL_IFACE_UNIX || CONFIG_CTRL_IFACE_UDP */
/**
* 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 {
#ifdef CONFIG_CTRL_IFACE_UDP
int s;
struct sockaddr_in local;
struct sockaddr_in dest;
char *cookie;
#endif /* CONFIG_CTRL_IFACE_UDP */
#ifdef CONFIG_CTRL_IFACE_UNIX
int s;
struct sockaddr_un local;
struct sockaddr_un dest;
#endif /* CONFIG_CTRL_IFACE_UNIX */
#ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
HANDLE pipe;
#endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
};
#ifdef CONFIG_CTRL_IFACE_UNIX
struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
struct wpa_ctrl *ctrl;
static int counter = 0;
ctrl = os_malloc(sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
os_memset(ctrl, 0, sizeof(*ctrl));
ctrl->s = socket(PF_UNIX, SOCK_DGRAM, 0);
if (ctrl->s < 0) {
os_free(ctrl);
return NULL;
}
ctrl->local.sun_family = AF_UNIX;
os_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);
os_free(ctrl);
return NULL;
}
ctrl->dest.sun_family = AF_UNIX;
os_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);
os_free(ctrl);
return NULL;
}
return ctrl;
}
void wpa_ctrl_close(struct wpa_ctrl *ctrl)
{
unlink(ctrl->local.sun_path);
close(ctrl->s);
os_free(ctrl);
}
#endif /* CONFIG_CTRL_IFACE_UNIX */
#ifdef CONFIG_CTRL_IFACE_UDP
struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
struct wpa_ctrl *ctrl;
char buf[128];
size_t len;
ctrl = os_malloc(sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
os_memset(ctrl, 0, sizeof(*ctrl));
ctrl->s = socket(PF_INET, SOCK_DGRAM, 0);
if (ctrl->s < 0) {
perror("socket");
os_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);
os_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(WPA_CTRL_IFACE_PORT);
if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
sizeof(ctrl->dest)) < 0) {
perror("connect");
close(ctrl->s);
os_free(ctrl);
return NULL;
}
len = sizeof(buf) - 1;
if (wpa_ctrl_request(ctrl, "GET_COOKIE", 10, buf, &len, NULL) == 0) {
buf[len] = '\0';
ctrl->cookie = strdup(buf);
}
return ctrl;
}
void wpa_ctrl_close(struct wpa_ctrl *ctrl)
{
close(ctrl->s);
os_free(ctrl->cookie);
os_free(ctrl);
}
#endif /* CONFIG_CTRL_IFACE_UDP */
#ifdef CTRL_IFACE_SOCKET
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;
const char *_cmd;
char *cmd_buf = NULL;
size_t _cmd_len;
#ifdef CONFIG_CTRL_IFACE_UDP
if (ctrl->cookie) {
char *pos;
_cmd_len = strlen(ctrl->cookie) + 1 + cmd_len;
cmd_buf = os_malloc(_cmd_len );
if (cmd_buf == NULL)
return -1;
_cmd = cmd_buf;
pos = cmd_buf;
strcpy(pos, ctrl->cookie);
pos += strlen(ctrl->cookie);
*pos++ = ' ';
memcpy(pos, cmd, cmd_len);
} else
#endif /* CONFIG_CTRL_IFACE_UDP */
{
_cmd = cmd;
_cmd_len = cmd_len;
}
if (send(ctrl->s, _cmd, _cmd_len, 0) < 0) {
os_free(cmd_buf);
return -1;
}
os_free(cmd_buf);
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;
}
#endif /* CTRL_IFACE_SOCKET */
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 && os_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);
}
#ifdef CTRL_IFACE_SOCKET
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;
fd_set rfds;
tv.tv_sec = 0;
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_SET(ctrl->s, &rfds);
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;
}
#endif /* CTRL_IFACE_SOCKET */
#ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
#ifndef WPA_SUPPLICANT_NAMED_PIPE
#define WPA_SUPPLICANT_NAMED_PIPE "WpaSupplicant"
#endif
#define NAMED_PIPE_PREFIX TEXT("\\\\.\\pipe\\") TEXT(WPA_SUPPLICANT_NAMED_PIPE)
struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
struct wpa_ctrl *ctrl;
DWORD mode;
TCHAR name[256];
int i;
ctrl = os_malloc(sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
os_memset(ctrl, 0, sizeof(*ctrl));
#ifdef UNICODE
if (ctrl_path == NULL)
_snwprintf(name, 256, NAMED_PIPE_PREFIX);
else
_snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"),
ctrl_path);
#else /* UNICODE */
if (ctrl_path == NULL)
os_snprintf(name, 256, NAMED_PIPE_PREFIX);
else
os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s",
ctrl_path);
#endif /* UNICODE */
for (i = 0; i < 10; i++) {
ctrl->pipe = CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0,
NULL, OPEN_EXISTING, 0, NULL);
/*
* Current named pipe server side in wpa_supplicant is
* re-opening the pipe for new clients only after the previous
* one is taken into use. This leaves a small window for race
* conditions when two connections are being opened at almost
* the same time. Retry if that was the case.
*/
if (ctrl->pipe != INVALID_HANDLE_VALUE ||
GetLastError() != ERROR_PIPE_BUSY)
break;
WaitNamedPipe(name, 1000);
}
if (ctrl->pipe == INVALID_HANDLE_VALUE) {
os_free(ctrl);
return NULL;
}
mode = PIPE_READMODE_MESSAGE;
if (!SetNamedPipeHandleState(ctrl->pipe, &mode, NULL, NULL)) {
CloseHandle(ctrl->pipe);
os_free(ctrl);
return NULL;
}
return ctrl;
}
void wpa_ctrl_close(struct wpa_ctrl *ctrl)
{
CloseHandle(ctrl->pipe);
os_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))
{
DWORD written;
DWORD readlen = *reply_len;
if (!WriteFile(ctrl->pipe, cmd, cmd_len, &written, NULL))
return -1;
if (!ReadFile(ctrl->pipe, reply, *reply_len, &readlen, NULL))
return -1;
*reply_len = readlen;
return 0;
}
int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
{
DWORD len = *reply_len;
if (!ReadFile(ctrl->pipe, reply, *reply_len, &len, NULL))
return -1;
*reply_len = len;
return 0;
}
int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
{
DWORD left;
if (!PeekNamedPipe(ctrl->pipe, NULL, 0, NULL, &left, NULL))
return -1;
return left ? 1 : 0;
}
int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
{
return -1;
}
#endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
#endif /* CONFIG_CTRL_IFACE */