freebsd-dev/contrib/hostapd/ctrl_iface.c
Sam Leffler fd7895c8dd stripped down import of hostapd 0.3.9
Approved by:	re (dwhite)
2005-06-13 17:00:32 +00:00

455 lines
10 KiB
C

/*
* Host AP (software wireless LAN access point) user space daemon for
* Host AP kernel driver / UNIX domain socket -based control interface
* Copyright (c) 2004, 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/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <errno.h>
#include <netinet/in.h>
#include "hostapd.h"
#include "eloop.h"
#include "config.h"
#include "eapol_sm.h"
#include "ieee802_1x.h"
#include "wpa.h"
#include "radius_client.h"
#include "ieee802_11.h"
#include "ctrl_iface.h"
#include "sta_info.h"
struct wpa_ctrl_dst {
struct wpa_ctrl_dst *next;
struct sockaddr_un addr;
socklen_t addrlen;
int debug_level;
int errors;
};
static int hostapd_ctrl_iface_attach(struct hostapd_data *hapd,
struct sockaddr_un *from,
socklen_t fromlen)
{
struct wpa_ctrl_dst *dst;
dst = malloc(sizeof(*dst));
if (dst == NULL)
return -1;
memset(dst, 0, sizeof(*dst));
memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
dst->addrlen = fromlen;
dst->debug_level = MSG_INFO;
dst->next = hapd->ctrl_dst;
hapd->ctrl_dst = dst;
wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
(u8 *) from->sun_path, fromlen);
return 0;
}
static int hostapd_ctrl_iface_detach(struct hostapd_data *hapd,
struct sockaddr_un *from,
socklen_t fromlen)
{
struct wpa_ctrl_dst *dst, *prev = NULL;
dst = hapd->ctrl_dst;
while (dst) {
if (fromlen == dst->addrlen &&
memcmp(from->sun_path, dst->addr.sun_path, fromlen) == 0) {
if (prev == NULL)
hapd->ctrl_dst = dst->next;
else
prev->next = dst->next;
free(dst);
wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
(u8 *) from->sun_path, fromlen);
return 0;
}
prev = dst;
dst = dst->next;
}
return -1;
}
static int hostapd_ctrl_iface_level(struct hostapd_data *hapd,
struct sockaddr_un *from,
socklen_t fromlen,
char *level)
{
struct wpa_ctrl_dst *dst;
wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
dst = hapd->ctrl_dst;
while (dst) {
if (fromlen == dst->addrlen &&
memcmp(from->sun_path, dst->addr.sun_path, fromlen) == 0) {
wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
"level", (u8 *) from->sun_path, fromlen);
dst->debug_level = atoi(level);
return 0;
}
dst = dst->next;
}
return -1;
}
static int hostapd_ctrl_iface_sta_mib(struct hostapd_data *hapd,
struct sta_info *sta,
char *buf, size_t buflen)
{
int len, res;
if (sta == NULL) {
return snprintf(buf, buflen, "FAIL\n");
}
len = 0;
len += snprintf(buf + len, buflen - len, MACSTR "\n",
MAC2STR(sta->addr));
res = ieee802_11_get_mib_sta(hapd, sta, buf + len, buflen - len);
if (res >= 0)
len += res;
res = wpa_get_mib_sta(hapd, sta, buf + len, buflen - len);
if (res >= 0)
len += res;
res = ieee802_1x_get_mib_sta(hapd, sta, buf + len, buflen - len);
if (res >= 0)
len += res;
return len;
}
static int hostapd_ctrl_iface_sta_first(struct hostapd_data *hapd,
char *buf, size_t buflen)
{
return hostapd_ctrl_iface_sta_mib(hapd, hapd->sta_list, buf, buflen);
}
static int hostapd_ctrl_iface_sta(struct hostapd_data *hapd,
const char *txtaddr,
char *buf, size_t buflen)
{
u8 addr[ETH_ALEN];
if (hwaddr_aton(txtaddr, addr))
return snprintf(buf, buflen, "FAIL\n");
return hostapd_ctrl_iface_sta_mib(hapd, ap_get_sta(hapd, addr),
buf, buflen);
}
static int hostapd_ctrl_iface_sta_next(struct hostapd_data *hapd,
const char *txtaddr,
char *buf, size_t buflen)
{
u8 addr[ETH_ALEN];
struct sta_info *sta;
if (hwaddr_aton(txtaddr, addr) ||
(sta = ap_get_sta(hapd, addr)) == NULL)
return snprintf(buf, buflen, "FAIL\n");
return hostapd_ctrl_iface_sta_mib(hapd, sta->next, buf, buflen);
}
static void hostapd_ctrl_iface_receive(int sock, void *eloop_ctx,
void *sock_ctx)
{
struct hostapd_data *hapd = eloop_ctx;
char buf[256];
int res;
struct sockaddr_un from;
socklen_t fromlen = sizeof(from);
char *reply;
const int reply_size = 4096;
int reply_len;
res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
(struct sockaddr *) &from, &fromlen);
if (res < 0) {
perror("recvfrom(ctrl_iface)");
return;
}
buf[res] = '\0';
wpa_hexdump_ascii(MSG_DEBUG, "RX ctrl_iface", (u8 *) buf, res);
reply = malloc(reply_size);
if (reply == NULL) {
sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
fromlen);
return;
}
memcpy(reply, "OK\n", 3);
reply_len = 3;
if (strcmp(buf, "PING") == 0) {
memcpy(reply, "PONG\n", 5);
reply_len = 5;
} else if (strcmp(buf, "MIB") == 0) {
reply_len = ieee802_11_get_mib(hapd, reply, reply_size);
if (reply_len >= 0) {
res = wpa_get_mib(hapd, reply + reply_len,
reply_size - reply_len);
if (res < 0)
reply_len = -1;
else
reply_len += res;
}
if (reply_len >= 0) {
res = ieee802_1x_get_mib(hapd, reply + reply_len,
reply_size - reply_len);
if (res < 0)
reply_len = -1;
else
reply_len += res;
}
if (reply_len >= 0) {
res = radius_client_get_mib(hapd->radius,
reply + reply_len,
reply_size - reply_len);
if (res < 0)
reply_len = -1;
else
reply_len += res;
}
} else if (strcmp(buf, "STA-FIRST") == 0) {
reply_len = hostapd_ctrl_iface_sta_first(hapd, reply,
reply_size);
} else if (strncmp(buf, "STA ", 4) == 0) {
reply_len = hostapd_ctrl_iface_sta(hapd, buf + 4, reply,
reply_size);
} else if (strncmp(buf, "STA-NEXT ", 9) == 0) {
reply_len = hostapd_ctrl_iface_sta_next(hapd, buf + 9, reply,
reply_size);
} else if (strcmp(buf, "ATTACH") == 0) {
if (hostapd_ctrl_iface_attach(hapd, &from, fromlen))
reply_len = -1;
} else if (strcmp(buf, "DETACH") == 0) {
if (hostapd_ctrl_iface_detach(hapd, &from, fromlen))
reply_len = -1;
} else if (strncmp(buf, "LEVEL ", 6) == 0) {
if (hostapd_ctrl_iface_level(hapd, &from, fromlen,
buf + 6))
reply_len = -1;
} else {
memcpy(reply, "UNKNOWN COMMAND\n", 16);
reply_len = 16;
}
if (reply_len < 0) {
memcpy(reply, "FAIL\n", 5);
reply_len = 5;
}
sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from, fromlen);
free(reply);
}
static char * hostapd_ctrl_iface_path(struct hostapd_data *hapd)
{
char *buf;
size_t len;
if (hapd->conf->ctrl_interface == NULL)
return NULL;
len = strlen(hapd->conf->ctrl_interface) + strlen(hapd->conf->iface) +
2;
buf = malloc(len);
if (buf == NULL)
return NULL;
snprintf(buf, len, "%s/%s",
hapd->conf->ctrl_interface, hapd->conf->iface);
return buf;
}
int hostapd_ctrl_iface_init(struct hostapd_data *hapd)
{
struct sockaddr_un addr;
int s = -1;
char *fname = NULL;
hapd->ctrl_sock = -1;
if (hapd->conf->ctrl_interface == NULL)
return 0;
if (mkdir(hapd->conf->ctrl_interface, S_IRWXU | S_IRWXG) < 0) {
if (errno == EEXIST) {
wpa_printf(MSG_DEBUG, "Using existing control "
"interface directory.");
} else {
perror("mkdir[ctrl_interface]");
goto fail;
}
}
if (chown(hapd->conf->ctrl_interface, 0,
hapd->conf->ctrl_interface_gid) < 0) {
perror("chown[ctrl_interface]");
return -1;
}
if (strlen(hapd->conf->ctrl_interface) + 1 + strlen(hapd->conf->iface)
>= sizeof(addr.sun_path))
goto fail;
s = socket(PF_UNIX, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket(PF_UNIX)");
goto fail;
}
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
fname = hostapd_ctrl_iface_path(hapd);
if (fname == NULL)
goto fail;
strncpy(addr.sun_path, fname, sizeof(addr.sun_path));
if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
perror("bind(PF_UNIX)");
goto fail;
}
if (chown(fname, 0, hapd->conf->ctrl_interface_gid) < 0) {
perror("chown[ctrl_interface/ifname]");
goto fail;
}
if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
perror("chmod[ctrl_interface/ifname]");
goto fail;
}
free(fname);
hapd->ctrl_sock = s;
eloop_register_read_sock(s, hostapd_ctrl_iface_receive, hapd,
NULL);
return 0;
fail:
if (s >= 0)
close(s);
if (fname) {
unlink(fname);
free(fname);
}
return -1;
}
void hostapd_ctrl_iface_deinit(struct hostapd_data *hapd)
{
struct wpa_ctrl_dst *dst, *prev;
if (hapd->ctrl_sock > -1) {
char *fname;
eloop_unregister_read_sock(hapd->ctrl_sock);
close(hapd->ctrl_sock);
hapd->ctrl_sock = -1;
fname = hostapd_ctrl_iface_path(hapd);
if (fname)
unlink(fname);
free(fname);
if (hapd->conf->ctrl_interface &&
rmdir(hapd->conf->ctrl_interface) < 0) {
if (errno == ENOTEMPTY) {
wpa_printf(MSG_DEBUG, "Control interface "
"directory not empty - leaving it "
"behind");
} else {
perror("rmdir[ctrl_interface]");
}
}
}
dst = hapd->ctrl_dst;
while (dst) {
prev = dst;
dst = dst->next;
free(prev);
}
}
void hostapd_ctrl_iface_send(struct hostapd_data *hapd, int level,
char *buf, size_t len)
{
struct wpa_ctrl_dst *dst, *next;
struct msghdr msg;
int idx;
struct iovec io[2];
char levelstr[10];
dst = hapd->ctrl_dst;
if (hapd->ctrl_sock < 0 || dst == NULL)
return;
snprintf(levelstr, sizeof(levelstr), "<%d>", level);
io[0].iov_base = levelstr;
io[0].iov_len = strlen(levelstr);
io[1].iov_base = buf;
io[1].iov_len = len;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = io;
msg.msg_iovlen = 2;
idx = 0;
while (dst) {
next = dst->next;
if (level >= dst->debug_level) {
wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
(u8 *) dst->addr.sun_path, dst->addrlen);
msg.msg_name = &dst->addr;
msg.msg_namelen = dst->addrlen;
if (sendmsg(hapd->ctrl_sock, &msg, 0) < 0) {
fprintf(stderr, "CTRL_IFACE monitor[%d]: ",
idx);
perror("sendmsg");
dst->errors++;
if (dst->errors > 10) {
hostapd_ctrl_iface_detach(
hapd, &dst->addr,
dst->addrlen);
}
} else
dst->errors = 0;
}
idx++;
dst = next;
}
}