484 lines
13 KiB
C
484 lines
13 KiB
C
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/**
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* @file NCDIfConfig.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <inttypes.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <linux/if_tun.h>
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#include <pwd.h>
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#include <misc/debug.h>
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#include <base/BLog.h>
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#include "NCDIfConfig.h"
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#include <generated/blog_channel_NCDIfConfig.h>
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#define IP_CMD "ip"
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#define MODPROBE_CMD "modprobe"
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#define RESOLVCONF_FILE "/etc/resolv.conf"
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#define RESOLVCONF_TEMP_FILE "/etc/resolv.conf-ncd-temp"
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#define TUN_DEVNODE "/dev/net/tun"
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static int run_command (const char *cmd)
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{
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BLog(BLOG_INFO, "run: %s", cmd);
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return system(cmd);
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}
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static int write_to_file (uint8_t *data, size_t data_len, FILE *f)
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{
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while (data_len > 0) {
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size_t bytes = fwrite(data, 1, data_len, f);
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if (bytes == 0) {
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return 0;
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}
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data += bytes;
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data_len -= bytes;
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}
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return 1;
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}
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int NCDIfConfig_query (const char *ifname)
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{
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struct ifreq ifr;
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int flags = 0;
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int s = socket(AF_INET, SOCK_DGRAM, 0);
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if (!s) {
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BLog(BLOG_ERROR, "socket failed");
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goto fail0;
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}
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memset(&ifr, 0, sizeof(ifr));
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snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", ifname);
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if (ioctl(s, SIOCGIFFLAGS, &ifr)) {
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BLog(BLOG_ERROR, "SIOCGIFFLAGS failed");
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goto fail1;
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}
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flags |= NCDIFCONFIG_FLAG_EXISTS;
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if ((ifr.ifr_flags&IFF_UP)) {
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flags |= NCDIFCONFIG_FLAG_UP;
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if ((ifr.ifr_flags&IFF_RUNNING)) {
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flags |= NCDIFCONFIG_FLAG_RUNNING;
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}
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}
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fail1:
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close(s);
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fail0:
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return flags;
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}
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int NCDIfConfig_set_up (const char *ifname)
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{
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if (strlen(ifname) >= IFNAMSIZ) {
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BLog(BLOG_ERROR, "ifname too long");
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return 0;
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}
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char cmd[50 + IFNAMSIZ];
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sprintf(cmd, IP_CMD" link set %s up", ifname);
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return !run_command(cmd);
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}
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int NCDIfConfig_set_down (const char *ifname)
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{
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if (strlen(ifname) >= IFNAMSIZ) {
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BLog(BLOG_ERROR, "ifname too long");
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return 0;
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}
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char cmd[50 + IFNAMSIZ];
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sprintf(cmd, IP_CMD" link set %s down", ifname);
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return !run_command(cmd);
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}
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int NCDIfConfig_add_ipv4_addr (const char *ifname, struct ipv4_ifaddr ifaddr)
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{
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ASSERT(ifaddr.prefix >= 0)
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ASSERT(ifaddr.prefix <= 32)
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if (strlen(ifname) >= IFNAMSIZ) {
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BLog(BLOG_ERROR, "ifname too long");
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return 0;
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}
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uint8_t *addr = (uint8_t *)&ifaddr.addr;
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char cmd[50 + IFNAMSIZ];
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sprintf(cmd, IP_CMD" addr add %"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8"/%d dev %s", addr[0], addr[1], addr[2], addr[3], ifaddr.prefix, ifname);
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return !run_command(cmd);
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}
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int NCDIfConfig_remove_ipv4_addr (const char *ifname, struct ipv4_ifaddr ifaddr)
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{
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ASSERT(ifaddr.prefix >= 0)
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ASSERT(ifaddr.prefix <= 32)
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if (strlen(ifname) >= IFNAMSIZ) {
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BLog(BLOG_ERROR, "ifname too long");
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return 0;
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}
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uint8_t *addr = (uint8_t *)&ifaddr.addr;
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char cmd[50 + IFNAMSIZ];
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sprintf(cmd, IP_CMD" addr del %"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8"/%d dev %s", addr[0], addr[1], addr[2], addr[3], ifaddr.prefix, ifname);
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return !run_command(cmd);
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}
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int NCDIfConfig_add_ipv6_addr (const char *ifname, struct ipv6_ifaddr ifaddr)
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{
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ASSERT(ifaddr.prefix >= 0)
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ASSERT(ifaddr.prefix <= 128)
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if (strlen(ifname) >= IFNAMSIZ) {
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BLog(BLOG_ERROR, "ifname too long");
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return 0;
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}
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char addr_str[IPADDR6_PRINT_MAX];
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ipaddr6_print_addr(ifaddr.addr, addr_str);
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char cmd[40 + IPADDR6_PRINT_MAX + IFNAMSIZ];
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sprintf(cmd, IP_CMD" addr add %s/%d dev %s", addr_str, ifaddr.prefix, ifname);
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return !run_command(cmd);
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}
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int NCDIfConfig_remove_ipv6_addr (const char *ifname, struct ipv6_ifaddr ifaddr)
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{
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ASSERT(ifaddr.prefix >= 0)
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ASSERT(ifaddr.prefix <= 128)
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if (strlen(ifname) >= IFNAMSIZ) {
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BLog(BLOG_ERROR, "ifname too long");
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return 0;
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}
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char addr_str[IPADDR6_PRINT_MAX];
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ipaddr6_print_addr(ifaddr.addr, addr_str);
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char cmd[40 + IPADDR6_PRINT_MAX + IFNAMSIZ];
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sprintf(cmd, IP_CMD" addr del %s/%d dev %s", addr_str, ifaddr.prefix, ifname);
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return !run_command(cmd);
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}
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static int route_cmd (const char *cmdtype, struct ipv4_ifaddr dest, const uint32_t *gateway, int metric, const char *ifname)
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{
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ASSERT(!strcmp(cmdtype, "add") || !strcmp(cmdtype, "del"))
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ASSERT(dest.prefix >= 0)
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ASSERT(dest.prefix <= 32)
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if (strlen(ifname) >= IFNAMSIZ) {
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BLog(BLOG_ERROR, "ifname too long");
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return 0;
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}
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uint8_t *d_addr = (uint8_t *)&dest.addr;
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char gwstr[30];
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if (gateway) {
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const uint8_t *g_addr = (uint8_t *)gateway;
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sprintf(gwstr, " via %"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8, g_addr[0], g_addr[1], g_addr[2], g_addr[3]);
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} else {
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gwstr[0] = '\0';
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}
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char cmd[120 + IFNAMSIZ];
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sprintf(cmd, IP_CMD" route %s %"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8"/%d%s metric %d dev %s",
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cmdtype, d_addr[0], d_addr[1], d_addr[2], d_addr[3], dest.prefix, gwstr, metric, ifname);
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return !run_command(cmd);
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}
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int NCDIfConfig_add_ipv4_route (struct ipv4_ifaddr dest, const uint32_t *gateway, int metric, const char *device)
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{
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return route_cmd("add", dest, gateway, metric, device);
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}
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int NCDIfConfig_remove_ipv4_route (struct ipv4_ifaddr dest, const uint32_t *gateway, int metric, const char *device)
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{
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return route_cmd("del", dest, gateway, metric, device);
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}
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static int route_cmd6 (const char *cmdtype, struct ipv6_ifaddr dest, const struct ipv6_addr *gateway, int metric, const char *ifname)
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{
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ASSERT(!strcmp(cmdtype, "add") || !strcmp(cmdtype, "del"))
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ASSERT(dest.prefix >= 0)
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ASSERT(dest.prefix <= 128)
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if (strlen(ifname) >= IFNAMSIZ) {
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BLog(BLOG_ERROR, "ifname too long");
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return 0;
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}
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char dest_str[IPADDR6_PRINT_MAX];
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ipaddr6_print_addr(dest.addr, dest_str);
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char gwstr[10 + IPADDR6_PRINT_MAX];
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if (gateway) {
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strcpy(gwstr, " via ");
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ipaddr6_print_addr(*gateway, gwstr + strlen(gwstr));
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} else {
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gwstr[0] = '\0';
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}
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char cmd[70 + IPADDR6_PRINT_MAX + IPADDR6_PRINT_MAX + IFNAMSIZ];
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sprintf(cmd, IP_CMD" route %s %s/%d%s metric %d dev %s",
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cmdtype, dest_str, dest.prefix, gwstr, metric, ifname);
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return !run_command(cmd);
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}
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int NCDIfConfig_add_ipv6_route (struct ipv6_ifaddr dest, const struct ipv6_addr *gateway, int metric, const char *device)
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{
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return route_cmd6("add", dest, gateway, metric, device);
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}
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int NCDIfConfig_remove_ipv6_route (struct ipv6_ifaddr dest, const struct ipv6_addr *gateway, int metric, const char *device)
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{
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return route_cmd6("del", dest, gateway, metric, device);
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}
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static int blackhole_route_cmd (const char *cmdtype, struct ipv4_ifaddr dest, int metric)
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{
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ASSERT(!strcmp(cmdtype, "add") || !strcmp(cmdtype, "del"))
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ASSERT(dest.prefix >= 0)
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ASSERT(dest.prefix <= 32)
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uint8_t *d_addr = (uint8_t *)&dest.addr;
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char cmd[120];
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sprintf(cmd, IP_CMD" route %s blackhole %"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8"/%d metric %d",
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cmdtype, d_addr[0], d_addr[1], d_addr[2], d_addr[3], dest.prefix, metric);
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return !run_command(cmd);
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}
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int NCDIfConfig_add_ipv4_blackhole_route (struct ipv4_ifaddr dest, int metric)
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{
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return blackhole_route_cmd("add", dest, metric);
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}
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int NCDIfConfig_remove_ipv4_blackhole_route (struct ipv4_ifaddr dest, int metric)
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{
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return blackhole_route_cmd("del", dest, metric);
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}
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static int blackhole_route_cmd6 (const char *cmdtype, struct ipv6_ifaddr dest, int metric)
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{
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ASSERT(!strcmp(cmdtype, "add") || !strcmp(cmdtype, "del"))
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ASSERT(dest.prefix >= 0)
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ASSERT(dest.prefix <= 128)
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char dest_str[IPADDR6_PRINT_MAX];
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ipaddr6_print_addr(dest.addr, dest_str);
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char cmd[70 + IPADDR6_PRINT_MAX];
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sprintf(cmd, IP_CMD" route %s blackhole %s/%d metric %d",
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cmdtype, dest_str, dest.prefix, metric);
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return !run_command(cmd);
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}
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int NCDIfConfig_add_ipv6_blackhole_route (struct ipv6_ifaddr dest, int metric)
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{
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return blackhole_route_cmd6("add", dest, metric);
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}
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int NCDIfConfig_remove_ipv6_blackhole_route (struct ipv6_ifaddr dest, int metric)
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{
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return blackhole_route_cmd6("del", dest, metric);
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}
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int NCDIfConfig_set_resolv_conf (const char *data, size_t data_len)
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{
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FILE *temp_file = fopen(RESOLVCONF_TEMP_FILE, "w");
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if (!temp_file) {
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BLog(BLOG_ERROR, "failed to open resolvconf temp file");
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goto fail0;
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}
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char line[] = "# generated by badvpn-ncd\n";
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if (!write_to_file((uint8_t *)line, strlen(line), temp_file) ||
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!write_to_file((uint8_t *)data, data_len, temp_file)
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) {
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BLog(BLOG_ERROR, "failed to write to resolvconf temp file");
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goto fail1;
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||
|
|
}
|
||
|
|
|
||
|
|
if (fclose(temp_file) != 0) {
|
||
|
|
BLog(BLOG_ERROR, "failed to close resolvconf temp file");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (rename(RESOLVCONF_TEMP_FILE, RESOLVCONF_FILE) < 0) {
|
||
|
|
BLog(BLOG_ERROR, "failed to rename resolvconf temp file to resolvconf file");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
fail1:
|
||
|
|
fclose(temp_file);
|
||
|
|
fail0:
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int open_tuntap (const char *ifname, int flags)
|
||
|
|
{
|
||
|
|
if (strlen(ifname) >= IFNAMSIZ) {
|
||
|
|
BLog(BLOG_ERROR, "ifname too long");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int fd = open(TUN_DEVNODE, O_RDWR);
|
||
|
|
if (fd < 0) {
|
||
|
|
BLog(BLOG_ERROR, "open tun failed");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct ifreq ifr;
|
||
|
|
memset(&ifr, 0, sizeof(ifr));
|
||
|
|
ifr.ifr_flags = flags;
|
||
|
|
snprintf(ifr.ifr_name, IFNAMSIZ, "%s", ifname);
|
||
|
|
|
||
|
|
if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
|
||
|
|
BLog(BLOG_ERROR, "TUNSETIFF failed");
|
||
|
|
close(fd);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return fd;
|
||
|
|
}
|
||
|
|
|
||
|
|
int NCDIfConfig_make_tuntap (const char *ifname, const char *owner, int tun)
|
||
|
|
{
|
||
|
|
// load tun module if needed
|
||
|
|
if (access(TUN_DEVNODE, F_OK) < 0) {
|
||
|
|
if (run_command(MODPROBE_CMD" tun") != 0) {
|
||
|
|
BLog(BLOG_ERROR, "modprobe tun failed");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int fd;
|
||
|
|
if ((fd = open_tuntap(ifname, (tun ? IFF_TUN : IFF_TAP))) < 0) {
|
||
|
|
goto fail0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (owner) {
|
||
|
|
long bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
|
||
|
|
if (bufsize < 0) {
|
||
|
|
bufsize = 16384;
|
||
|
|
}
|
||
|
|
|
||
|
|
char *buf = malloc(bufsize);
|
||
|
|
if (!buf) {
|
||
|
|
BLog(BLOG_ERROR, "malloc failed");
|
||
|
|
goto fail1;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct passwd pwd;
|
||
|
|
struct passwd *res;
|
||
|
|
getpwnam_r(owner, &pwd, buf, bufsize, &res);
|
||
|
|
if (!res) {
|
||
|
|
BLog(BLOG_ERROR, "getpwnam_r failed");
|
||
|
|
free(buf);
|
||
|
|
goto fail1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int uid = pwd.pw_uid;
|
||
|
|
|
||
|
|
free(buf);
|
||
|
|
|
||
|
|
if (ioctl(fd, TUNSETOWNER, uid) < 0) {
|
||
|
|
BLog(BLOG_ERROR, "TUNSETOWNER failed");
|
||
|
|
goto fail1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ioctl(fd, TUNSETPERSIST, (void *)1) < 0) {
|
||
|
|
BLog(BLOG_ERROR, "TUNSETPERSIST failed");
|
||
|
|
goto fail1;
|
||
|
|
}
|
||
|
|
|
||
|
|
close(fd);
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
fail1:
|
||
|
|
close(fd);
|
||
|
|
fail0:
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int NCDIfConfig_remove_tuntap (const char *ifname, int tun)
|
||
|
|
{
|
||
|
|
int fd;
|
||
|
|
if ((fd = open_tuntap(ifname, (tun ? IFF_TUN : IFF_TAP))) < 0) {
|
||
|
|
goto fail0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ioctl(fd, TUNSETPERSIST, (void *)0) < 0) {
|
||
|
|
BLog(BLOG_ERROR, "TUNSETPERSIST failed");
|
||
|
|
goto fail1;
|
||
|
|
}
|
||
|
|
|
||
|
|
close(fd);
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
fail1:
|
||
|
|
close(fd);
|
||
|
|
fail0:
|
||
|
|
return 0;
|
||
|
|
}
|