34965eb118
am: be6d330c18
* commit 'be6d330c18f861fe10c0b238f74cecb2c9783205':
libnetutils: Check socket() return value
719 lines
18 KiB
C
719 lines
18 KiB
C
/*
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* Copyright 2008, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <pthread.h>
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <netdb.h>
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#include <linux/if.h>
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#include <linux/if_ether.h>
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#include <linux/if_arp.h>
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#include <linux/netlink.h>
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#include <linux/route.h>
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#include <linux/ipv6_route.h>
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#include <linux/rtnetlink.h>
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#include <linux/sockios.h>
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#include "netutils/ifc.h"
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#ifdef ANDROID
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#define LOG_TAG "NetUtils"
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#include <cutils/log.h>
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#include <cutils/properties.h>
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#else
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#include <stdio.h>
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#include <string.h>
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#define ALOGD printf
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#define ALOGW printf
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#endif
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#if defined(__ANDROID__)
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/* SIOCKILLADDR is an Android extension. */
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#define SIOCKILLADDR 0x8939
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#endif
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static int ifc_ctl_sock = -1;
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static int ifc_ctl_sock6 = -1;
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static pthread_mutex_t ifc_sock_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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static pthread_mutex_t ifc_sock6_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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void printerr(char *fmt, ...);
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#define DBG 0
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#define INET_ADDRLEN 4
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#define INET6_ADDRLEN 16
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in_addr_t prefixLengthToIpv4Netmask(int prefix_length)
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{
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in_addr_t mask = 0;
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// C99 (6.5.7): shifts of 32 bits have undefined results
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if (prefix_length <= 0 || prefix_length > 32) {
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return 0;
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}
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mask = ~mask << (32 - prefix_length);
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mask = htonl(mask);
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return mask;
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}
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int ipv4NetmaskToPrefixLength(in_addr_t mask)
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{
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int prefixLength = 0;
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uint32_t m = (uint32_t)ntohl(mask);
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while (m & 0x80000000) {
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prefixLength++;
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m = m << 1;
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}
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return prefixLength;
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}
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static const char *ipaddr_to_string(in_addr_t addr)
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{
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struct in_addr in_addr;
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in_addr.s_addr = addr;
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return inet_ntoa(in_addr);
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}
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int string_to_ip(const char *string, struct sockaddr_storage *ss) {
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struct addrinfo hints, *ai;
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int ret;
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if (ss == NULL) {
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return -EFAULT;
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}
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_flags = AI_NUMERICHOST;
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hints.ai_socktype = SOCK_DGRAM;
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ret = getaddrinfo(string, NULL, &hints, &ai);
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if (ret == 0) {
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memcpy(ss, ai->ai_addr, ai->ai_addrlen);
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freeaddrinfo(ai);
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}
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return ret;
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}
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int ifc_init(void)
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{
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int ret;
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pthread_mutex_lock(&ifc_sock_mutex);
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if (ifc_ctl_sock == -1) {
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ifc_ctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (ifc_ctl_sock < 0) {
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printerr("socket() failed: %s\n", strerror(errno));
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}
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}
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ret = ifc_ctl_sock < 0 ? -1 : 0;
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if (DBG) printerr("ifc_init_returning %d", ret);
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return ret;
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}
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int ifc_init6(void)
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{
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pthread_mutex_lock(&ifc_sock6_mutex);
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if (ifc_ctl_sock6 == -1) {
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ifc_ctl_sock6 = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (ifc_ctl_sock6 < 0) {
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printerr("socket() failed: %s\n", strerror(errno));
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}
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}
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return ifc_ctl_sock6 < 0 ? -1 : 0;
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}
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void ifc_close(void)
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{
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if (DBG) printerr("ifc_close");
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if (ifc_ctl_sock != -1) {
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(void)close(ifc_ctl_sock);
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ifc_ctl_sock = -1;
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}
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pthread_mutex_unlock(&ifc_sock_mutex);
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}
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void ifc_close6(void)
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{
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if (ifc_ctl_sock6 != -1) {
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(void)close(ifc_ctl_sock6);
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ifc_ctl_sock6 = -1;
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}
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pthread_mutex_unlock(&ifc_sock6_mutex);
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}
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static void ifc_init_ifr(const char *name, struct ifreq *ifr)
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{
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memset(ifr, 0, sizeof(struct ifreq));
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strncpy(ifr->ifr_name, name, IFNAMSIZ);
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ifr->ifr_name[IFNAMSIZ - 1] = 0;
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}
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int ifc_get_hwaddr(const char *name, void *ptr)
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{
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int r;
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struct ifreq ifr;
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ifc_init_ifr(name, &ifr);
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r = ioctl(ifc_ctl_sock, SIOCGIFHWADDR, &ifr);
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if(r < 0) return -1;
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memcpy(ptr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
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return 0;
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}
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int ifc_get_ifindex(const char *name, int *if_indexp)
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{
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int r;
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struct ifreq ifr;
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ifc_init_ifr(name, &ifr);
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r = ioctl(ifc_ctl_sock, SIOCGIFINDEX, &ifr);
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if(r < 0) return -1;
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*if_indexp = ifr.ifr_ifindex;
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return 0;
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}
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static int ifc_set_flags(const char *name, unsigned set, unsigned clr)
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{
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struct ifreq ifr;
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ifc_init_ifr(name, &ifr);
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if(ioctl(ifc_ctl_sock, SIOCGIFFLAGS, &ifr) < 0) return -1;
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ifr.ifr_flags = (ifr.ifr_flags & (~clr)) | set;
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return ioctl(ifc_ctl_sock, SIOCSIFFLAGS, &ifr);
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}
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int ifc_up(const char *name)
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{
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int ret = ifc_set_flags(name, IFF_UP, 0);
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if (DBG) printerr("ifc_up(%s) = %d", name, ret);
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return ret;
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}
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int ifc_down(const char *name)
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{
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int ret = ifc_set_flags(name, 0, IFF_UP);
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if (DBG) printerr("ifc_down(%s) = %d", name, ret);
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return ret;
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}
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static void init_sockaddr_in(struct sockaddr *sa, in_addr_t addr)
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{
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struct sockaddr_in *sin = (struct sockaddr_in *) sa;
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sin->sin_family = AF_INET;
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sin->sin_port = 0;
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sin->sin_addr.s_addr = addr;
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}
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int ifc_set_addr(const char *name, in_addr_t addr)
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{
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struct ifreq ifr;
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int ret;
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ifc_init_ifr(name, &ifr);
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init_sockaddr_in(&ifr.ifr_addr, addr);
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ret = ioctl(ifc_ctl_sock, SIOCSIFADDR, &ifr);
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if (DBG) printerr("ifc_set_addr(%s, xx) = %d", name, ret);
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return ret;
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}
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/*
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* Adds or deletes an IP address on an interface.
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*
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* Action is one of:
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* - RTM_NEWADDR (to add a new address)
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* - RTM_DELADDR (to delete an existing address)
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*
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* Returns zero on success and negative errno on failure.
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*/
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int ifc_act_on_address(int action, const char *name, const char *address,
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int prefixlen) {
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int ifindex, s, len, ret;
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struct sockaddr_storage ss;
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int saved_errno;
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void *addr;
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size_t addrlen;
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struct {
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struct nlmsghdr n;
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struct ifaddrmsg r;
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// Allow for IPv6 address, headers, and padding.
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char attrbuf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
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NLMSG_ALIGN(sizeof(struct rtattr)) +
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NLMSG_ALIGN(INET6_ADDRLEN)];
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} req;
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struct rtattr *rta;
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struct nlmsghdr *nh;
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struct nlmsgerr *err;
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char buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
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NLMSG_ALIGN(sizeof(struct nlmsgerr)) +
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NLMSG_ALIGN(sizeof(struct nlmsghdr))];
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// Get interface ID.
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ifindex = if_nametoindex(name);
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if (ifindex == 0) {
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return -errno;
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}
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// Convert string representation to sockaddr_storage.
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ret = string_to_ip(address, &ss);
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if (ret) {
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return ret;
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}
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// Determine address type and length.
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if (ss.ss_family == AF_INET) {
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struct sockaddr_in *sin = (struct sockaddr_in *) &ss;
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addr = &sin->sin_addr;
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addrlen = INET_ADDRLEN;
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} else if (ss.ss_family == AF_INET6) {
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &ss;
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addr = &sin6->sin6_addr;
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addrlen = INET6_ADDRLEN;
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} else {
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return -EAFNOSUPPORT;
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}
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// Fill in netlink structures.
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memset(&req, 0, sizeof(req));
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// Netlink message header.
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req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.r));
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req.n.nlmsg_type = action;
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req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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req.n.nlmsg_pid = getpid();
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// Interface address message header.
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req.r.ifa_family = ss.ss_family;
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req.r.ifa_prefixlen = prefixlen;
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req.r.ifa_index = ifindex;
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// Routing attribute. Contains the actual IP address.
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rta = (struct rtattr *) (((char *) &req) + NLMSG_ALIGN(req.n.nlmsg_len));
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rta->rta_type = IFA_LOCAL;
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rta->rta_len = RTA_LENGTH(addrlen);
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req.n.nlmsg_len = NLMSG_ALIGN(req.n.nlmsg_len) + RTA_LENGTH(addrlen);
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memcpy(RTA_DATA(rta), addr, addrlen);
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s = socket(PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
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if (s < 0) {
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return -errno;
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}
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if (send(s, &req, req.n.nlmsg_len, 0) < 0) {
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saved_errno = errno;
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close(s);
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return -saved_errno;
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}
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len = recv(s, buf, sizeof(buf), 0);
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saved_errno = errno;
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close(s);
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if (len < 0) {
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return -saved_errno;
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}
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// Parse the acknowledgement to find the return code.
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nh = (struct nlmsghdr *) buf;
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if (!NLMSG_OK(nh, (unsigned) len) || nh->nlmsg_type != NLMSG_ERROR) {
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return -EINVAL;
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}
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err = NLMSG_DATA(nh);
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// Return code is negative errno.
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return err->error;
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}
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int ifc_add_address(const char *name, const char *address, int prefixlen) {
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return ifc_act_on_address(RTM_NEWADDR, name, address, prefixlen);
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}
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int ifc_del_address(const char *name, const char * address, int prefixlen) {
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return ifc_act_on_address(RTM_DELADDR, name, address, prefixlen);
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}
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/*
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* Clears IPv6 addresses on the specified interface.
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*/
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int ifc_clear_ipv6_addresses(const char *name) {
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char rawaddrstr[INET6_ADDRSTRLEN], addrstr[INET6_ADDRSTRLEN];
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unsigned int prefixlen;
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int lasterror = 0, i, j, ret;
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char ifname[64]; // Currently, IFNAMSIZ = 16.
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FILE *f = fopen("/proc/net/if_inet6", "r");
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if (!f) {
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return -errno;
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}
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// Format:
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// 20010db8000a0001fc446aa4b5b347ed 03 40 00 01 wlan0
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while (fscanf(f, "%32s %*02x %02x %*02x %*02x %63s\n",
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rawaddrstr, &prefixlen, ifname) == 3) {
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// Is this the interface we're looking for?
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if (strcmp(name, ifname)) {
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continue;
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}
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// Put the colons back into the address.
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for (i = 0, j = 0; i < 32; i++, j++) {
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addrstr[j] = rawaddrstr[i];
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if (i % 4 == 3) {
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addrstr[++j] = ':';
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}
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}
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addrstr[j - 1] = '\0';
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// Don't delete the link-local address as well, or it will disable IPv6
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// on the interface.
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if (strncmp(addrstr, "fe80:", 5) == 0) {
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continue;
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}
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ret = ifc_del_address(ifname, addrstr, prefixlen);
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if (ret) {
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ALOGE("Deleting address %s/%d on %s: %s", addrstr, prefixlen, ifname,
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strerror(-ret));
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lasterror = ret;
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}
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}
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fclose(f);
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return lasterror;
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}
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/*
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* Clears IPv4 addresses on the specified interface.
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*/
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void ifc_clear_ipv4_addresses(const char *name) {
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unsigned count, addr;
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ifc_init();
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for (count=0, addr=1;((addr != 0) && (count < 255)); count++) {
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if (ifc_get_addr(name, &addr) < 0)
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break;
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if (addr)
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ifc_set_addr(name, 0);
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}
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ifc_close();
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}
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/*
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* Clears all IP addresses on the specified interface.
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*/
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int ifc_clear_addresses(const char *name) {
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ifc_clear_ipv4_addresses(name);
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return ifc_clear_ipv6_addresses(name);
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}
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int ifc_set_hwaddr(const char *name, const void *ptr)
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{
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struct ifreq ifr;
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ifc_init_ifr(name, &ifr);
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ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
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memcpy(&ifr.ifr_hwaddr.sa_data, ptr, ETH_ALEN);
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return ioctl(ifc_ctl_sock, SIOCSIFHWADDR, &ifr);
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}
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int ifc_set_mask(const char *name, in_addr_t mask)
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{
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struct ifreq ifr;
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int ret;
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ifc_init_ifr(name, &ifr);
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init_sockaddr_in(&ifr.ifr_addr, mask);
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ret = ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &ifr);
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if (DBG) printerr("ifc_set_mask(%s, xx) = %d", name, ret);
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return ret;
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}
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int ifc_set_prefixLength(const char *name, int prefixLength)
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{
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struct ifreq ifr;
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// TODO - support ipv6
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if (prefixLength > 32 || prefixLength < 0) return -1;
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in_addr_t mask = prefixLengthToIpv4Netmask(prefixLength);
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ifc_init_ifr(name, &ifr);
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init_sockaddr_in(&ifr.ifr_addr, mask);
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return ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &ifr);
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}
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int ifc_get_addr(const char *name, in_addr_t *addr)
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{
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struct ifreq ifr;
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int ret = 0;
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ifc_init_ifr(name, &ifr);
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if (addr != NULL) {
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ret = ioctl(ifc_ctl_sock, SIOCGIFADDR, &ifr);
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if (ret < 0) {
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*addr = 0;
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} else {
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*addr = ((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr;
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}
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}
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return ret;
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}
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int ifc_get_info(const char *name, in_addr_t *addr, int *prefixLength, unsigned *flags)
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{
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struct ifreq ifr;
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ifc_init_ifr(name, &ifr);
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if (addr != NULL) {
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if(ioctl(ifc_ctl_sock, SIOCGIFADDR, &ifr) < 0) {
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*addr = 0;
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} else {
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*addr = ((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr;
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}
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}
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if (prefixLength != NULL) {
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if(ioctl(ifc_ctl_sock, SIOCGIFNETMASK, &ifr) < 0) {
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*prefixLength = 0;
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} else {
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*prefixLength = ipv4NetmaskToPrefixLength(
|
|
((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr);
|
|
}
|
|
}
|
|
|
|
if (flags != NULL) {
|
|
if(ioctl(ifc_ctl_sock, SIOCGIFFLAGS, &ifr) < 0) {
|
|
*flags = 0;
|
|
} else {
|
|
*flags = ifr.ifr_flags;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ifc_act_on_ipv4_route(int action, const char *ifname, struct in_addr dst, int prefix_length,
|
|
struct in_addr gw)
|
|
{
|
|
struct rtentry rt;
|
|
int result;
|
|
in_addr_t netmask;
|
|
|
|
memset(&rt, 0, sizeof(rt));
|
|
|
|
rt.rt_dst.sa_family = AF_INET;
|
|
rt.rt_dev = (void*) ifname;
|
|
|
|
netmask = prefixLengthToIpv4Netmask(prefix_length);
|
|
init_sockaddr_in(&rt.rt_genmask, netmask);
|
|
init_sockaddr_in(&rt.rt_dst, dst.s_addr);
|
|
rt.rt_flags = RTF_UP;
|
|
|
|
if (prefix_length == 32) {
|
|
rt.rt_flags |= RTF_HOST;
|
|
}
|
|
|
|
if (gw.s_addr != 0) {
|
|
rt.rt_flags |= RTF_GATEWAY;
|
|
init_sockaddr_in(&rt.rt_gateway, gw.s_addr);
|
|
}
|
|
|
|
ifc_init();
|
|
|
|
if (ifc_ctl_sock < 0) {
|
|
ifc_close();
|
|
return -errno;
|
|
}
|
|
|
|
result = ioctl(ifc_ctl_sock, action, &rt);
|
|
if (result < 0) {
|
|
if (errno == EEXIST) {
|
|
result = 0;
|
|
} else {
|
|
result = -errno;
|
|
}
|
|
}
|
|
ifc_close();
|
|
return result;
|
|
}
|
|
|
|
/* deprecated - v4 only */
|
|
int ifc_create_default_route(const char *name, in_addr_t gw)
|
|
{
|
|
struct in_addr in_dst, in_gw;
|
|
|
|
in_dst.s_addr = 0;
|
|
in_gw.s_addr = gw;
|
|
|
|
int ret = ifc_act_on_ipv4_route(SIOCADDRT, name, in_dst, 0, in_gw);
|
|
if (DBG) printerr("ifc_create_default_route(%s, %d) = %d", name, gw, ret);
|
|
return ret;
|
|
}
|
|
|
|
// Needed by code in hidden partner repositories / branches, so don't delete.
|
|
int ifc_enable(const char *ifname)
|
|
{
|
|
int result;
|
|
|
|
ifc_init();
|
|
result = ifc_up(ifname);
|
|
ifc_close();
|
|
return result;
|
|
}
|
|
|
|
// Needed by code in hidden partner repositories / branches, so don't delete.
|
|
int ifc_disable(const char *ifname)
|
|
{
|
|
unsigned addr, count;
|
|
int result;
|
|
|
|
ifc_init();
|
|
result = ifc_down(ifname);
|
|
|
|
ifc_set_addr(ifname, 0);
|
|
for (count=0, addr=1;((addr != 0) && (count < 255)); count++) {
|
|
if (ifc_get_addr(ifname, &addr) < 0)
|
|
break;
|
|
if (addr)
|
|
ifc_set_addr(ifname, 0);
|
|
}
|
|
|
|
ifc_close();
|
|
return result;
|
|
}
|
|
|
|
int ifc_reset_connections(const char *ifname, const int reset_mask)
|
|
{
|
|
#if defined(__ANDROID__)
|
|
int result, success;
|
|
in_addr_t myaddr = 0;
|
|
struct ifreq ifr;
|
|
struct in6_ifreq ifr6;
|
|
|
|
if (reset_mask & RESET_IPV4_ADDRESSES) {
|
|
/* IPv4. Clear connections on the IP address. */
|
|
ifc_init();
|
|
if (!(reset_mask & RESET_IGNORE_INTERFACE_ADDRESS)) {
|
|
ifc_get_info(ifname, &myaddr, NULL, NULL);
|
|
}
|
|
ifc_init_ifr(ifname, &ifr);
|
|
init_sockaddr_in(&ifr.ifr_addr, myaddr);
|
|
result = ioctl(ifc_ctl_sock, SIOCKILLADDR, &ifr);
|
|
ifc_close();
|
|
} else {
|
|
result = 0;
|
|
}
|
|
|
|
if (reset_mask & RESET_IPV6_ADDRESSES) {
|
|
/*
|
|
* IPv6. On Linux, when an interface goes down it loses all its IPv6
|
|
* addresses, so we don't know which connections belonged to that interface
|
|
* So we clear all unused IPv6 connections on the device by specifying an
|
|
* empty IPv6 address.
|
|
*/
|
|
ifc_init6();
|
|
// This implicitly specifies an address of ::, i.e., kill all IPv6 sockets.
|
|
memset(&ifr6, 0, sizeof(ifr6));
|
|
success = ioctl(ifc_ctl_sock6, SIOCKILLADDR, &ifr6);
|
|
if (result == 0) {
|
|
result = success;
|
|
}
|
|
ifc_close6();
|
|
}
|
|
|
|
return result;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Removes the default route for the named interface.
|
|
*/
|
|
int ifc_remove_default_route(const char *ifname)
|
|
{
|
|
struct rtentry rt;
|
|
int result;
|
|
|
|
ifc_init();
|
|
memset(&rt, 0, sizeof(rt));
|
|
rt.rt_dev = (void *)ifname;
|
|
rt.rt_flags = RTF_UP|RTF_GATEWAY;
|
|
init_sockaddr_in(&rt.rt_dst, 0);
|
|
if ((result = ioctl(ifc_ctl_sock, SIOCDELRT, &rt)) < 0) {
|
|
ALOGD("failed to remove default route for %s: %s", ifname, strerror(errno));
|
|
}
|
|
ifc_close();
|
|
return result;
|
|
}
|
|
|
|
int
|
|
ifc_configure(const char *ifname,
|
|
in_addr_t address,
|
|
uint32_t prefixLength,
|
|
in_addr_t gateway,
|
|
in_addr_t dns1,
|
|
in_addr_t dns2) {
|
|
|
|
char dns_prop_name[PROPERTY_KEY_MAX];
|
|
|
|
ifc_init();
|
|
|
|
if (ifc_up(ifname)) {
|
|
printerr("failed to turn on interface %s: %s\n", ifname, strerror(errno));
|
|
ifc_close();
|
|
return -1;
|
|
}
|
|
if (ifc_set_addr(ifname, address)) {
|
|
printerr("failed to set ipaddr %s: %s\n", ipaddr_to_string(address), strerror(errno));
|
|
ifc_close();
|
|
return -1;
|
|
}
|
|
if (ifc_set_prefixLength(ifname, prefixLength)) {
|
|
printerr("failed to set prefixLength %d: %s\n", prefixLength, strerror(errno));
|
|
ifc_close();
|
|
return -1;
|
|
}
|
|
if (ifc_create_default_route(ifname, gateway)) {
|
|
printerr("failed to set default route %s: %s\n", ipaddr_to_string(gateway), strerror(errno));
|
|
ifc_close();
|
|
return -1;
|
|
}
|
|
|
|
ifc_close();
|
|
|
|
snprintf(dns_prop_name, sizeof(dns_prop_name), "net.%s.dns1", ifname);
|
|
property_set(dns_prop_name, dns1 ? ipaddr_to_string(dns1) : "");
|
|
snprintf(dns_prop_name, sizeof(dns_prop_name), "net.%s.dns2", ifname);
|
|
property_set(dns_prop_name, dns2 ? ipaddr_to_string(dns2) : "");
|
|
|
|
return 0;
|
|
}
|