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Unverified Commit c5dc704a by Wolfgang Bumiller Committed by GitHub
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Merge pull request #2568 from brauner/2018-08-22/ifaddrs

include: add safe getifaddrs() version
parents 898b34e6 d029e1de
Showing with 391 additions and 1273 deletions
configure.ac
......@@ -611,7 +611,12 @@ AC_CHECK_DECLS([PR_SET_NO_NEW_PRIVS], [], [], [#include <sys/prctl.h>])
AC_CHECK_DECLS([PR_GET_NO_NEW_PRIVS], [], [], [#include <sys/prctl.h>])
# Check for some headers
AC_CHECK_HEADERS([sys/signalfd.h pty.h ifaddrs.h sys/memfd.h sys/personality.h utmpx.h sys/timerfd.h sys/resource.h])
AC_CHECK_HEADERS([sys/signalfd.h pty.h sys/memfd.h sys/personality.h utmpx.h sys/timerfd.h sys/resource.h])
AC_CHECK_HEADER([ifaddrs.h],
AM_CONDITIONAL(HAVE_IFADDRS_H, true)
AC_DEFINE(HAVE_IFADDRS_H, 1, [Have ifaddrs.h]),
AM_CONDITIONAL(HAVE_IFADDRS_H, false))
# lookup major()/minor()/makedev()
AC_HEADER_MAJOR
......
src/include/ifaddrs.c
/*
Copyright (c) 2013, Kenneth MacKay
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "ifaddrs.h"
#include <string.h>
#include <stdlib.h>
#define _GNU_SOURCE
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
typedef struct NetlinkList
{
struct NetlinkList *m_next;
struct nlmsghdr *m_data;
unsigned int m_size;
} NetlinkList;
#include "ifaddrs.h"
static int netlink_socket(void)
{
int l_socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if(l_socket < 0)
{
return -1;
}
struct sockaddr_nl l_addr;
memset(&l_addr, 0, sizeof(l_addr));
l_addr.nl_family = AF_NETLINK;
if(bind(l_socket, (struct sockaddr *)&l_addr, sizeof(l_addr)) < 0)
{
close(l_socket);
return -1;
}
return l_socket;
}
#define IFADDRS_HASH_SIZE 64
static int netlink_send(int p_socket, int p_request)
{
char l_buffer[NLMSG_ALIGN(sizeof(struct nlmsghdr)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))];
memset(l_buffer, 0, sizeof(l_buffer));
struct nlmsghdr *l_hdr = (struct nlmsghdr *)l_buffer;
struct rtgenmsg *l_msg = (struct rtgenmsg *)NLMSG_DATA(l_hdr);
l_hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*l_msg));
l_hdr->nlmsg_type = p_request;
l_hdr->nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
l_hdr->nlmsg_pid = 0;
l_hdr->nlmsg_seq = p_socket;
l_msg->rtgen_family = AF_UNSPEC;
struct sockaddr_nl l_addr;
memset(&l_addr, 0, sizeof(l_addr));
l_addr.nl_family = AF_NETLINK;
return (sendto(p_socket, l_hdr, l_hdr->nlmsg_len, 0, (struct sockaddr *)&l_addr, sizeof(l_addr)));
}
#define __NETLINK_ALIGN(len) (((len) + 3) & ~3)
static int netlink_recv(int p_socket, void *p_buffer, size_t p_len)
{
struct msghdr l_msg;
struct iovec l_iov = { p_buffer, p_len };
struct sockaddr_nl l_addr;
for(;;)
{
l_msg.msg_name = (void *)&l_addr;
l_msg.msg_namelen = sizeof(l_addr);
l_msg.msg_iov = &l_iov;
l_msg.msg_iovlen = 1;
l_msg.msg_control = NULL;
l_msg.msg_controllen = 0;
l_msg.msg_flags = 0;
int l_result = recvmsg(p_socket, &l_msg, 0);
if(l_result < 0)
{
if(errno == EINTR)
{
continue;
}
return -2;
}
if(l_msg.msg_flags & MSG_TRUNC)
{ // buffer was too small
return -1;
}
return l_result;
}
}
#define __NLMSG_OK(nlh, end) \
((char *)(end) - (char *)(nlh) >= sizeof(struct nlmsghdr))
static struct nlmsghdr *getNetlinkResponse(int p_socket, int *p_size, int *p_done)
{
size_t l_size = 4096;
void *l_buffer = NULL;
for(;;)
{
free(l_buffer);
l_buffer = malloc(l_size);
int l_read = netlink_recv(p_socket, l_buffer, l_size);
*p_size = l_read;
if(l_read == -2)
{
free(l_buffer);
return NULL;
}
if(l_read >= 0)
{
pid_t l_pid = getpid();
struct nlmsghdr *l_hdr;
for(l_hdr = (struct nlmsghdr *)l_buffer; NLMSG_OK(l_hdr, (unsigned int)l_read); l_hdr = (struct nlmsghdr *)NLMSG_NEXT(l_hdr, l_read))
{
if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
{
continue;
}
if(l_hdr->nlmsg_type == NLMSG_DONE)
{
*p_done = 1;
break;
}
if(l_hdr->nlmsg_type == NLMSG_ERROR)
{
free(l_buffer);
return NULL;
}
}
return l_buffer;
}
l_size *= 2;
}
}
#define __NLMSG_NEXT(nlh) \
(struct nlmsghdr *)((char *)(nlh) + __NETLINK_ALIGN((nlh)->nlmsg_len))
static NetlinkList *newListItem(struct nlmsghdr *p_data, unsigned int p_size)
{
NetlinkList *l_item = malloc(sizeof(NetlinkList));
l_item->m_next = NULL;
l_item->m_data = p_data;
l_item->m_size = p_size;
return l_item;
}
#define __NLMSG_DATA(nlh) ((void *)((char *)(nlh) + sizeof(struct nlmsghdr)))
static void freeResultList(NetlinkList *p_list)
{
NetlinkList *l_cur;
while(p_list)
{
l_cur = p_list;
p_list = p_list->m_next;
free(l_cur->m_data);
free(l_cur);
}
}
#define __NLMSG_DATAEND(nlh) ((char *)(nlh) + (nlh)->nlmsg_len)
static NetlinkList *getResultList(int p_socket, int p_request)
{
if(netlink_send(p_socket, p_request) < 0)
{
return NULL;
}
NetlinkList *l_list = NULL;
NetlinkList *l_end = NULL;
int l_size;
int l_done = 0;
while(!l_done)
{
struct nlmsghdr *l_hdr = getNetlinkResponse(p_socket, &l_size, &l_done);
if(!l_hdr)
{ // error
freeResultList(l_list);
return NULL;
}
NetlinkList *l_item = newListItem(l_hdr, l_size);
if(!l_list)
{
l_list = l_item;
}
else
{
l_end->m_next = l_item;
}
l_end = l_item;
}
return l_list;
}
#define __NLMSG_RTA(nlh, len) \
((void *)((char *)(nlh) + sizeof(struct nlmsghdr) + \
__NETLINK_ALIGN(len)))
static size_t maxSize(size_t a, size_t b)
{
return (a > b ? a : b);
}
#define __RTA_DATALEN(rta) ((rta)->rta_len - sizeof(struct rtattr))
#define __RTA_NEXT(rta) \
(struct rtattr *)((char *)(rta) + __NETLINK_ALIGN((rta)->rta_len))
#define __RTA_OK(nlh, end) \
((char *)(end) - (char *)(rta) >= sizeof(struct rtattr))
#define __NLMSG_RTAOK(rta, nlh) __RTA_OK(rta, __NLMSG_DATAEND(nlh))
#define __IN6_IS_ADDR_LINKLOCAL(a) \
((((uint8_t *)(a))[0]) == 0xfe && (((uint8_t *)(a))[1] & 0xc0) == 0x80)
#define __IN6_IS_ADDR_MC_LINKLOCAL(a) \
(IN6_IS_ADDR_MULTICAST(a) && ((((uint8_t *)(a))[1] & 0xf) == 0x2))
#define __RTA_DATA(rta) ((void *)((char *)(rta) + sizeof(struct rtattr)))
static size_t calcAddrLen(sa_family_t p_family, int p_dataSize)
/* getifaddrs() reports hardware addresses with PF_PACKET that implies
* struct sockaddr_ll. But e.g. Infiniband socket address length is
* longer than sockaddr_ll.ssl_addr[8] can hold. Use this hack struct
* to extend ssl_addr - callers should be able to still use it. */
struct sockaddr_ll_hack {
unsigned short sll_family, sll_protocol;
int sll_ifindex;
unsigned short sll_hatype;
unsigned char sll_pkttype, sll_halen;
unsigned char sll_addr[24];
};
union sockany {
struct sockaddr sa;
struct sockaddr_ll_hack ll;
struct sockaddr_in v4;
struct sockaddr_in6 v6;
};
struct ifaddrs_storage {
struct ifaddrs ifa;
struct ifaddrs_storage *hash_next;
union sockany addr, netmask, ifu;
unsigned int index;
char name[IFNAMSIZ + 1];
};
struct ifaddrs_ctx {
struct ifaddrs_storage *first;
struct ifaddrs_storage *last;
struct ifaddrs_storage *hash[IFADDRS_HASH_SIZE];
};
void freeifaddrs(struct ifaddrs *ifp)
{
switch(p_family)
{
case AF_INET:
return sizeof(struct sockaddr_in);
case AF_INET6:
return sizeof(struct sockaddr_in6);
case AF_PACKET:
return maxSize(sizeof(struct sockaddr_ll), offsetof(struct sockaddr_ll, sll_addr) + p_dataSize);
default:
return maxSize(sizeof(struct sockaddr), offsetof(struct sockaddr, sa_data) + p_dataSize);
}
struct ifaddrs *n;
while (ifp) {
n = ifp->ifa_next;
free(ifp);
ifp = n;
}
}
static void makeSockaddr(sa_family_t p_family, struct sockaddr *p_dest, void *p_data, size_t p_size)
static void copy_addr(struct sockaddr **r, int af, union sockany *sa,
void *addr, size_t addrlen, int ifindex)
{
switch(p_family)
{
case AF_INET:
memcpy(&((struct sockaddr_in*)p_dest)->sin_addr, p_data, p_size);
break;
case AF_INET6:
memcpy(&((struct sockaddr_in6*)p_dest)->sin6_addr, p_data, p_size);
break;
case AF_PACKET:
memcpy(((struct sockaddr_ll*)p_dest)->sll_addr, p_data, p_size);
((struct sockaddr_ll*)p_dest)->sll_halen = p_size;
break;
default:
memcpy(p_dest->sa_data, p_data, p_size);
break;
}
p_dest->sa_family = p_family;
uint8_t *dst;
size_t len;
switch (af) {
case AF_INET:
dst = (uint8_t *)&sa->v4.sin_addr;
len = 4;
break;
case AF_INET6:
dst = (uint8_t *)&sa->v6.sin6_addr;
len = 16;
if (__IN6_IS_ADDR_LINKLOCAL(addr) || __IN6_IS_ADDR_MC_LINKLOCAL(addr))
sa->v6.sin6_scope_id = ifindex;
break;
default:
return;
}
if (addrlen < len)
return;
sa->sa.sa_family = af;
memcpy(dst, addr, len);
*r = &sa->sa;
}
static void addToEnd(struct ifaddrs **p_resultList, struct ifaddrs *p_entry)
static void gen_netmask(struct sockaddr **r, int af, union sockany *sa,
int prefixlen)
{
if(!*p_resultList)
{
*p_resultList = p_entry;
}
else
{
struct ifaddrs *l_cur = *p_resultList;
while(l_cur->ifa_next)
{
l_cur = l_cur->ifa_next;
}
l_cur->ifa_next = p_entry;
}
uint8_t addr[16] = {0};
int i;
if ((size_t)prefixlen > 8 * sizeof(addr))
prefixlen = 8 * sizeof(addr);
i = prefixlen / 8;
memset(addr, 0xff, i);
if ((size_t)i < sizeof(addr))
addr[i++] = 0xff << (8 - (prefixlen % 8));
copy_addr(r, af, sa, addr, sizeof(addr), 0);
}
static void interpretLink(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
static void copy_lladdr(struct sockaddr **r, union sockany *sa, void *addr,
size_t addrlen, int ifindex, unsigned short hatype)
{
struct ifinfomsg *l_info = (struct ifinfomsg *)NLMSG_DATA(p_hdr);
size_t l_nameSize = 0;
size_t l_addrSize = 0;
size_t l_dataSize = 0;
size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
struct rtattr *l_rta;
for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifinfomsg))); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFLA_ADDRESS:
case IFLA_BROADCAST:
l_addrSize += NLMSG_ALIGN(calcAddrLen(AF_PACKET, l_rtaDataSize));
break;
case IFLA_IFNAME:
l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
break;
case IFLA_STATS:
l_dataSize += NLMSG_ALIGN(l_rtaSize);
break;
default:
break;
}
}
struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + l_nameSize + l_addrSize + l_dataSize);
memset(l_entry, 0, sizeof(struct ifaddrs));
l_entry->ifa_name = "";
char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
char *l_addr = l_name + l_nameSize;
char *l_data = l_addr + l_addrSize;
l_entry->ifa_flags = l_info->ifi_flags;
l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifinfomsg))); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
void *l_rtaData = RTA_DATA(l_rta);
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFLA_ADDRESS:
case IFLA_BROADCAST:
{
size_t l_addrLen = calcAddrLen(AF_PACKET, l_rtaDataSize);
makeSockaddr(AF_PACKET, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
((struct sockaddr_ll *)l_addr)->sll_ifindex = l_info->ifi_index;
((struct sockaddr_ll *)l_addr)->sll_hatype = l_info->ifi_type;
if(l_rta->rta_type == IFLA_ADDRESS)
{
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
}
l_addr += NLMSG_ALIGN(l_addrLen);
break;
}
case IFLA_IFNAME:
strncpy(l_name, l_rtaData, l_rtaDataSize);
l_name[l_rtaDataSize] = '\0';
l_entry->ifa_name = l_name;
break;
case IFLA_STATS:
memcpy(l_data, l_rtaData, l_rtaDataSize);
l_entry->ifa_data = l_data;
break;
default:
break;
}
}
addToEnd(p_resultList, l_entry);
p_links[l_info->ifi_index - 1] = l_entry;
if (addrlen > sizeof(sa->ll.sll_addr))
return;
sa->ll.sll_family = AF_PACKET;
sa->ll.sll_ifindex = ifindex;
sa->ll.sll_hatype = hatype;
sa->ll.sll_halen = addrlen;
memcpy(sa->ll.sll_addr, addr, addrlen);
*r = &sa->sa;
}
static void interpretAddr(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
static int nl_msg_to_ifaddr(void *pctx, struct nlmsghdr *h)
{
struct ifaddrmsg *l_info = (struct ifaddrmsg *)NLMSG_DATA(p_hdr);
size_t l_nameSize = 0;
size_t l_addrSize = 0;
int l_addedNetmask = 0;
size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
struct rtattr *l_rta;
for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
if(l_info->ifa_family == AF_PACKET)
{
continue;
}
switch(l_rta->rta_type)
{
case IFA_ADDRESS:
case IFA_LOCAL:
if((l_info->ifa_family == AF_INET || l_info->ifa_family == AF_INET6) && !l_addedNetmask)
{ // make room for netmask
l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
l_addedNetmask = 1;
}
case IFA_BROADCAST:
l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
break;
case IFA_LABEL:
l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
break;
default:
break;
}
}
struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + l_nameSize + l_addrSize);
memset(l_entry, 0, sizeof(struct ifaddrs));
l_entry->ifa_name = p_links[l_info->ifa_index - 1]->ifa_name;
char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
char *l_addr = l_name + l_nameSize;
l_entry->ifa_flags = l_info->ifa_flags | p_links[l_info->ifa_index - 1]->ifa_flags;
l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
void *l_rtaData = RTA_DATA(l_rta);
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFA_ADDRESS:
case IFA_BROADCAST:
case IFA_LOCAL:
{
size_t l_addrLen = calcAddrLen(l_info->ifa_family, l_rtaDataSize);
makeSockaddr(l_info->ifa_family, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
if(l_info->ifa_family == AF_INET6)
{
if(IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)l_rtaData) || IN6_IS_ADDR_MC_LINKLOCAL((struct in6_addr *)l_rtaData))
{
((struct sockaddr_in6 *)l_addr)->sin6_scope_id = l_info->ifa_index;
}
}
if(l_rta->rta_type == IFA_ADDRESS)
{ // apparently in a point-to-point network IFA_ADDRESS contains the dest address and IFA_LOCAL contains the local address
if(l_entry->ifa_addr)
{
l_entry->ifa_dstaddr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
}
else if(l_rta->rta_type == IFA_LOCAL)
{
if(l_entry->ifa_addr)
{
l_entry->ifa_dstaddr = l_entry->ifa_addr;
}
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
}
l_addr += NLMSG_ALIGN(l_addrLen);
break;
}
case IFA_LABEL:
strncpy(l_name, l_rtaData, l_rtaDataSize);
l_name[l_rtaDataSize] = '\0';
l_entry->ifa_name = l_name;
break;
default:
break;
}
}
if(l_entry->ifa_addr && (l_entry->ifa_addr->sa_family == AF_INET || l_entry->ifa_addr->sa_family == AF_INET6))
{
unsigned l_maxPrefix = (l_entry->ifa_addr->sa_family == AF_INET ? 32 : 128);
unsigned l_prefix = (l_info->ifa_prefixlen > l_maxPrefix ? l_maxPrefix : l_info->ifa_prefixlen);
char l_mask[16] = {0};
unsigned i;
for(i=0; i<(l_prefix/8); ++i)
{
l_mask[i] = 0xff;
}
if (l_prefix % 8) {
l_mask[i] = 0xff << (8 - (l_prefix % 8));
}
makeSockaddr(l_entry->ifa_addr->sa_family, (struct sockaddr *)l_addr, l_mask, l_maxPrefix / 8);
l_entry->ifa_netmask = (struct sockaddr *)l_addr;
}
addToEnd(p_resultList, l_entry);
struct ifaddrs_storage *ifs, *ifs0;
struct rtattr *rta;
int stats_len = 0;
struct ifinfomsg *ifi = __NLMSG_DATA(h);
struct ifaddrmsg *ifa = __NLMSG_DATA(h);
struct ifaddrs_ctx *ctx = pctx;
if (h->nlmsg_type == RTM_NEWLINK) {
for (rta = __NLMSG_RTA(h, sizeof(*ifi)); __NLMSG_RTAOK(rta, h);
rta = __RTA_NEXT(rta)) {
if (rta->rta_type != IFLA_STATS)
continue;
stats_len = __RTA_DATALEN(rta);
break;
}
} else {
for (ifs0 = ctx->hash[ifa->ifa_index % IFADDRS_HASH_SIZE]; ifs0;
ifs0 = ifs0->hash_next)
if (ifs0->index == ifa->ifa_index)
break;
if (!ifs0)
return 0;
}
ifs = calloc(1, sizeof(struct ifaddrs_storage) + stats_len);
if (!ifs) {
errno = ENOMEM;
return -1;
}
if (h->nlmsg_type == RTM_NEWLINK) {
ifs->index = ifi->ifi_index;
ifs->ifa.ifa_flags = ifi->ifi_flags;
for (rta = __NLMSG_RTA(h, sizeof(*ifi)); __NLMSG_RTAOK(rta, h);
rta = __RTA_NEXT(rta)) {
switch (rta->rta_type) {
case IFLA_IFNAME:
if (__RTA_DATALEN(rta) < sizeof(ifs->name)) {
memcpy(ifs->name, __RTA_DATA(rta),
__RTA_DATALEN(rta));
ifs->ifa.ifa_name = ifs->name;
}
break;
case IFLA_ADDRESS:
copy_lladdr(&ifs->ifa.ifa_addr, &ifs->addr,
__RTA_DATA(rta), __RTA_DATALEN(rta),
ifi->ifi_index, ifi->ifi_type);
break;
case IFLA_BROADCAST:
copy_lladdr(&ifs->ifa.ifa_broadaddr, &ifs->ifu,
__RTA_DATA(rta), __RTA_DATALEN(rta),
ifi->ifi_index, ifi->ifi_type);
break;
case IFLA_STATS:
ifs->ifa.ifa_data = (void *)(ifs + 1);
memcpy(ifs->ifa.ifa_data, __RTA_DATA(rta),
__RTA_DATALEN(rta));
break;
}
}
if (ifs->ifa.ifa_name) {
unsigned int bucket = ifs->index % IFADDRS_HASH_SIZE;
ifs->hash_next = ctx->hash[bucket];
ctx->hash[bucket] = ifs;
}
} else {
ifs->ifa.ifa_name = ifs0->ifa.ifa_name;
ifs->ifa.ifa_flags = ifs0->ifa.ifa_flags;
for (rta = __NLMSG_RTA(h, sizeof(*ifa)); __NLMSG_RTAOK(rta, h);
rta = __RTA_NEXT(rta)) {
switch (rta->rta_type) {
case IFA_ADDRESS:
/* If ifa_addr is already set we, received an
* IFA_LOCAL before so treat this as destination
* address.
*/
if (ifs->ifa.ifa_addr)
copy_addr(&ifs->ifa.ifa_dstaddr,
ifa->ifa_family, &ifs->ifu,
__RTA_DATA(rta),
__RTA_DATALEN(rta),
ifa->ifa_index);
else
copy_addr(&ifs->ifa.ifa_addr,
ifa->ifa_family, &ifs->addr,
__RTA_DATA(rta),
__RTA_DATALEN(rta),
ifa->ifa_index);
break;
case IFA_BROADCAST:
copy_addr(&ifs->ifa.ifa_broadaddr,
ifa->ifa_family, &ifs->ifu,
__RTA_DATA(rta), __RTA_DATALEN(rta),
ifa->ifa_index);
break;
case IFA_LOCAL:
/* If ifa_addr is set and we get IFA_LOCAL,
* assume we have a point-to-point network. Move
* address to correct field.
*/
if (ifs->ifa.ifa_addr) {
ifs->ifu = ifs->addr;
ifs->ifa.ifa_dstaddr = &ifs->ifu.sa;
memset(&ifs->addr, 0, sizeof(ifs->addr));
}
copy_addr(&ifs->ifa.ifa_addr, ifa->ifa_family,
&ifs->addr, __RTA_DATA(rta),
__RTA_DATALEN(rta), ifa->ifa_index);
break;
case IFA_LABEL:
if (__RTA_DATALEN(rta) < sizeof(ifs->name)) {
memcpy(ifs->name, __RTA_DATA(rta),
__RTA_DATALEN(rta));
ifs->ifa.ifa_name = ifs->name;
}
break;
}
}
if (ifs->ifa.ifa_addr)
gen_netmask(&ifs->ifa.ifa_netmask, ifa->ifa_family,
&ifs->netmask, ifa->ifa_prefixlen);
}
if (ifs->ifa.ifa_name) {
if (!ctx->first)
ctx->first = ifs;
if (ctx->last)
ctx->last->ifa.ifa_next = &ifs->ifa;
ctx->last = ifs;
} else {
free(ifs);
}
return 0;
}
static void interpret(int p_socket, NetlinkList *p_netlinkList, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
static int __nl_recv(int fd, unsigned int seq, int type, int af,
int (*cb)(void *ctx, struct nlmsghdr *h),
void *ctx)
{
pid_t l_pid = getpid();
for(; p_netlinkList; p_netlinkList = p_netlinkList->m_next)
{
unsigned int l_nlsize = p_netlinkList->m_size;
struct nlmsghdr *l_hdr;
for(l_hdr = p_netlinkList->m_data; NLMSG_OK(l_hdr, l_nlsize); l_hdr = NLMSG_NEXT(l_hdr, l_nlsize))
{
if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
{
continue;
}
if(l_hdr->nlmsg_type == NLMSG_DONE)
{
break;
}
if(l_hdr->nlmsg_type == RTM_NEWLINK)
{
interpretLink(l_hdr, p_links, p_resultList);
}
else if(l_hdr->nlmsg_type == RTM_NEWADDR)
{
interpretAddr(l_hdr, p_links, p_resultList);
}
}
}
struct nlmsghdr *h;
union {
uint8_t buf[8192];
struct {
struct nlmsghdr nlh;
struct rtgenmsg g;
} req;
struct nlmsghdr reply;
} u;
int r, ret;
memset(&u.req, 0, sizeof(u.req));
u.req.nlh.nlmsg_len = sizeof(u.req);
u.req.nlh.nlmsg_type = type;
u.req.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
u.req.nlh.nlmsg_seq = seq;
u.req.g.rtgen_family = af;
r = send(fd, &u.req, sizeof(u.req), 0);
if (r < 0)
return r;
for (;;) {
r = recv(fd, u.buf, sizeof(u.buf), MSG_DONTWAIT);
if (r <= 0)
return -1;
for (h = &u.reply; __NLMSG_OK(h, (void *)&u.buf[r]);
h = __NLMSG_NEXT(h)) {
if (h->nlmsg_type == NLMSG_DONE)
return 0;
if (h->nlmsg_type == NLMSG_ERROR) {
errno = EINVAL;
return -1;
}
ret = cb(ctx, h);
if (ret)
return ret;
}
}
}
static unsigned countLinks(int p_socket, NetlinkList *p_netlinkList)
static int __rtnl_enumerate(int link_af, int addr_af,
int (*cb)(void *ctx, struct nlmsghdr *h), void *ctx)
{
unsigned l_links = 0;
pid_t l_pid = getpid();
for(; p_netlinkList; p_netlinkList = p_netlinkList->m_next)
{
unsigned int l_nlsize = p_netlinkList->m_size;
struct nlmsghdr *l_hdr;
for(l_hdr = p_netlinkList->m_data; NLMSG_OK(l_hdr, l_nlsize); l_hdr = NLMSG_NEXT(l_hdr, l_nlsize))
{
if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
{
continue;
}
if(l_hdr->nlmsg_type == NLMSG_DONE)
{
break;
}
if(l_hdr->nlmsg_type == RTM_NEWLINK)
{
++l_links;
}
}
}
return l_links;
int fd, r, saved_errno;
fd = socket(PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
if (fd < 0)
return -1;
r = __nl_recv(fd, 1, RTM_GETLINK, link_af, cb, ctx);
if (!r)
r = __nl_recv(fd, 2, RTM_GETADDR, addr_af, cb, ctx);
saved_errno = errno;
close(fd);
errno = saved_errno;
return r;
}
int getifaddrs(struct ifaddrs **ifap)
{
if(!ifap)
{
return -1;
}
*ifap = NULL;
int l_socket = netlink_socket();
if(l_socket < 0)
{
return -1;
}
NetlinkList *l_linkResults = getResultList(l_socket, RTM_GETLINK);
if(!l_linkResults)
{
close(l_socket);
return -1;
}
NetlinkList *l_addrResults = getResultList(l_socket, RTM_GETADDR);
if(!l_addrResults)
{
close(l_socket);
freeResultList(l_linkResults);
return -1;
}
unsigned l_numLinks = countLinks(l_socket, l_linkResults) + countLinks(l_socket, l_addrResults);
struct ifaddrs **l_links;
l_links = malloc(l_numLinks * sizeof(struct ifaddrs *));
if (!l_links)
{
close(l_socket);
freeResultList(l_linkResults);
return -1;
}
memset(l_links, 0, l_numLinks * sizeof(struct ifaddrs *));
interpret(l_socket, l_linkResults, l_links, ifap);
interpret(l_socket, l_addrResults, l_links, ifap);
freeResultList(l_linkResults);
freeResultList(l_addrResults);
free(l_links);
close(l_socket);
return 0;
}
int r, saved_errno;
struct ifaddrs_ctx _ctx;
struct ifaddrs_ctx *ctx = &_ctx;
void freeifaddrs(struct ifaddrs *ifa)
{
struct ifaddrs *l_cur;
while(ifa)
{
l_cur = ifa;
ifa = ifa->ifa_next;
free(l_cur);
}
memset(ctx, 0, sizeof *ctx);
r = __rtnl_enumerate(AF_UNSPEC, AF_UNSPEC, nl_msg_to_ifaddr, ctx);
saved_errno = errno;
if (r < 0)
freeifaddrs(&ctx->first->ifa);
else
*ifap = &ctx->first->ifa;
errno = saved_errno;
return r;
}
src/include/ifaddrs.h
/*
* Copyright (c) 1995, 1999
* Berkeley Software Design, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* BSDI ifaddrs.h,v 2.5 2000/02/23 14:51:59 dab Exp
*/
#ifndef _IFADDRS_H
#define _IFADDRS_H
#ifndef _IFADDRS_H_
#define _IFADDRS_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <features.h>
#include <netinet/in.h>
#include <sys/socket.h>
struct ifaddrs {
struct ifaddrs *ifa_next;
char *ifa_name;
unsigned int ifa_flags;
struct sockaddr *ifa_addr;
struct sockaddr *ifa_netmask;
struct sockaddr *ifa_dstaddr;
void *ifa_data;
struct ifaddrs *ifa_next;
char *ifa_name;
unsigned ifa_flags;
struct sockaddr *ifa_addr;
struct sockaddr *ifa_netmask;
union {
struct sockaddr *ifu_broadaddr;
struct sockaddr *ifu_dstaddr;
} ifa_ifu;
void *ifa_data;
};
#define ifa_broadaddr ifa_ifu.ifu_broadaddr
#define ifa_dstaddr ifa_ifu.ifu_dstaddr
/*
* This may have been defined in <net/if.h>. Note that if <net/if.h> is
* to be included it must be included before this header file.
*/
#ifndef ifa_broadaddr
#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
#endif
void freeifaddrs(struct ifaddrs *);
int getifaddrs(struct ifaddrs **);
#include <sys/cdefs.h>
__BEGIN_DECLS
extern int getifaddrs(struct ifaddrs **ifap);
extern void freeifaddrs(struct ifaddrs *ifa);
__END_DECLS
#ifdef __cplusplus
}
#endif
#endif
src/lxc/Makefile.am
......@@ -132,9 +132,12 @@ liblxc_la_SOURCES = af_unix.c af_unix.h \
version.h \
$(LSM_SOURCES)
if !HAVE_IFADDRS_H
liblxc_la_SOURCES += ../include/ifaddrs.c ../include/ifaddrs.h
endif
if IS_BIONIC
liblxc_la_SOURCES += ../include/ifaddrs.c ../include/ifaddrs.h \
../include/lxcmntent.c ../include/lxcmntent.h \
liblxc_la_SOURCES += ../include/lxcmntent.c ../include/lxcmntent.h \
../include/openpty.c ../include/openpty.h
endif
......
src/lxc/tools/include/ifaddrs.c deleted 100644 → 0
/*
Copyright (c) 2013, Kenneth MacKay
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "ifaddrs.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
typedef struct NetlinkList
{
struct NetlinkList *m_next;
struct nlmsghdr *m_data;
unsigned int m_size;
} NetlinkList;
static int netlink_socket(void)
{
int l_socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if(l_socket < 0)
{
return -1;
}
struct sockaddr_nl l_addr;
memset(&l_addr, 0, sizeof(l_addr));
l_addr.nl_family = AF_NETLINK;
if(bind(l_socket, (struct sockaddr *)&l_addr, sizeof(l_addr)) < 0)
{
close(l_socket);
return -1;
}
return l_socket;
}
static int netlink_send(int p_socket, int p_request)
{
char l_buffer[NLMSG_ALIGN(sizeof(struct nlmsghdr)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))];
memset(l_buffer, 0, sizeof(l_buffer));
struct nlmsghdr *l_hdr = (struct nlmsghdr *)l_buffer;
struct rtgenmsg *l_msg = (struct rtgenmsg *)NLMSG_DATA(l_hdr);
l_hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*l_msg));
l_hdr->nlmsg_type = p_request;
l_hdr->nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
l_hdr->nlmsg_pid = 0;
l_hdr->nlmsg_seq = p_socket;
l_msg->rtgen_family = AF_UNSPEC;
struct sockaddr_nl l_addr;
memset(&l_addr, 0, sizeof(l_addr));
l_addr.nl_family = AF_NETLINK;
return (sendto(p_socket, l_hdr, l_hdr->nlmsg_len, 0, (struct sockaddr *)&l_addr, sizeof(l_addr)));
}
static int netlink_recv(int p_socket, void *p_buffer, size_t p_len)
{
struct msghdr l_msg;
struct iovec l_iov = { p_buffer, p_len };
struct sockaddr_nl l_addr;
for(;;)
{
l_msg.msg_name = (void *)&l_addr;
l_msg.msg_namelen = sizeof(l_addr);
l_msg.msg_iov = &l_iov;
l_msg.msg_iovlen = 1;
l_msg.msg_control = NULL;
l_msg.msg_controllen = 0;
l_msg.msg_flags = 0;
int l_result = recvmsg(p_socket, &l_msg, 0);
if(l_result < 0)
{
if(errno == EINTR)
{
continue;
}
return -2;
}
if(l_msg.msg_flags & MSG_TRUNC)
{ // buffer was too small
return -1;
}
return l_result;
}
}
static struct nlmsghdr *getNetlinkResponse(int p_socket, int *p_size, int *p_done)
{
size_t l_size = 4096;
void *l_buffer = NULL;
for(;;)
{
free(l_buffer);
l_buffer = malloc(l_size);
int l_read = netlink_recv(p_socket, l_buffer, l_size);
*p_size = l_read;
if(l_read == -2)
{
free(l_buffer);
return NULL;
}
if(l_read >= 0)
{
pid_t l_pid = getpid();
struct nlmsghdr *l_hdr;
for(l_hdr = (struct nlmsghdr *)l_buffer; NLMSG_OK(l_hdr, (unsigned int)l_read); l_hdr = (struct nlmsghdr *)NLMSG_NEXT(l_hdr, l_read))
{
if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
{
continue;
}
if(l_hdr->nlmsg_type == NLMSG_DONE)
{
*p_done = 1;
break;
}
if(l_hdr->nlmsg_type == NLMSG_ERROR)
{
free(l_buffer);
return NULL;
}
}
return l_buffer;
}
l_size *= 2;
}
}
static NetlinkList *newListItem(struct nlmsghdr *p_data, unsigned int p_size)
{
NetlinkList *l_item = malloc(sizeof(NetlinkList));
l_item->m_next = NULL;
l_item->m_data = p_data;
l_item->m_size = p_size;
return l_item;
}
static void freeResultList(NetlinkList *p_list)
{
NetlinkList *l_cur;
while(p_list)
{
l_cur = p_list;
p_list = p_list->m_next;
free(l_cur->m_data);
free(l_cur);
}
}
static NetlinkList *getResultList(int p_socket, int p_request)
{
if(netlink_send(p_socket, p_request) < 0)
{
return NULL;
}
NetlinkList *l_list = NULL;
NetlinkList *l_end = NULL;
int l_size;
int l_done = 0;
while(!l_done)
{
struct nlmsghdr *l_hdr = getNetlinkResponse(p_socket, &l_size, &l_done);
if(!l_hdr)
{ // error
freeResultList(l_list);
return NULL;
}
NetlinkList *l_item = newListItem(l_hdr, l_size);
if(!l_list)
{
l_list = l_item;
}
else
{
l_end->m_next = l_item;
}
l_end = l_item;
}
return l_list;
}
static size_t maxSize(size_t a, size_t b)
{
return (a > b ? a : b);
}
static size_t calcAddrLen(sa_family_t p_family, int p_dataSize)
{
switch(p_family)
{
case AF_INET:
return sizeof(struct sockaddr_in);
case AF_INET6:
return sizeof(struct sockaddr_in6);
case AF_PACKET:
return maxSize(sizeof(struct sockaddr_ll), offsetof(struct sockaddr_ll, sll_addr) + p_dataSize);
default:
return maxSize(sizeof(struct sockaddr), offsetof(struct sockaddr, sa_data) + p_dataSize);
}
}
static void makeSockaddr(sa_family_t p_family, struct sockaddr *p_dest, void *p_data, size_t p_size)
{
switch(p_family)
{
case AF_INET:
memcpy(&((struct sockaddr_in*)p_dest)->sin_addr, p_data, p_size);
break;
case AF_INET6:
memcpy(&((struct sockaddr_in6*)p_dest)->sin6_addr, p_data, p_size);
break;
case AF_PACKET:
memcpy(((struct sockaddr_ll*)p_dest)->sll_addr, p_data, p_size);
((struct sockaddr_ll*)p_dest)->sll_halen = p_size;
break;
default:
memcpy(p_dest->sa_data, p_data, p_size);
break;
}
p_dest->sa_family = p_family;
}
static void addToEnd(struct ifaddrs **p_resultList, struct ifaddrs *p_entry)
{
if(!*p_resultList)
{
*p_resultList = p_entry;
}
else
{
struct ifaddrs *l_cur = *p_resultList;
while(l_cur->ifa_next)
{
l_cur = l_cur->ifa_next;
}
l_cur->ifa_next = p_entry;
}
}
static void interpretLink(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
{
struct ifinfomsg *l_info = (struct ifinfomsg *)NLMSG_DATA(p_hdr);
size_t l_nameSize = 0;
size_t l_addrSize = 0;
size_t l_dataSize = 0;
size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
struct rtattr *l_rta;
for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifinfomsg))); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFLA_ADDRESS:
case IFLA_BROADCAST:
l_addrSize += NLMSG_ALIGN(calcAddrLen(AF_PACKET, l_rtaDataSize));
break;
case IFLA_IFNAME:
l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
break;
case IFLA_STATS:
l_dataSize += NLMSG_ALIGN(l_rtaSize);
break;
default:
break;
}
}
struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + l_nameSize + l_addrSize + l_dataSize);
memset(l_entry, 0, sizeof(struct ifaddrs));
l_entry->ifa_name = "";
char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
char *l_addr = l_name + l_nameSize;
char *l_data = l_addr + l_addrSize;
l_entry->ifa_flags = l_info->ifi_flags;
l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifinfomsg))); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
void *l_rtaData = RTA_DATA(l_rta);
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFLA_ADDRESS:
case IFLA_BROADCAST:
{
size_t l_addrLen = calcAddrLen(AF_PACKET, l_rtaDataSize);
makeSockaddr(AF_PACKET, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
((struct sockaddr_ll *)l_addr)->sll_ifindex = l_info->ifi_index;
((struct sockaddr_ll *)l_addr)->sll_hatype = l_info->ifi_type;
if(l_rta->rta_type == IFLA_ADDRESS)
{
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
}
l_addr += NLMSG_ALIGN(l_addrLen);
break;
}
case IFLA_IFNAME:
strncpy(l_name, l_rtaData, l_rtaDataSize);
l_name[l_rtaDataSize] = '\0';
l_entry->ifa_name = l_name;
break;
case IFLA_STATS:
memcpy(l_data, l_rtaData, l_rtaDataSize);
l_entry->ifa_data = l_data;
break;
default:
break;
}
}
addToEnd(p_resultList, l_entry);
p_links[l_info->ifi_index - 1] = l_entry;
}
static void interpretAddr(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
{
struct ifaddrmsg *l_info = (struct ifaddrmsg *)NLMSG_DATA(p_hdr);
size_t l_nameSize = 0;
size_t l_addrSize = 0;
int l_addedNetmask = 0;
size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
struct rtattr *l_rta;
for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
if(l_info->ifa_family == AF_PACKET)
{
continue;
}
switch(l_rta->rta_type)
{
case IFA_ADDRESS:
case IFA_LOCAL:
if((l_info->ifa_family == AF_INET || l_info->ifa_family == AF_INET6) && !l_addedNetmask)
{ // make room for netmask
l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
l_addedNetmask = 1;
}
case IFA_BROADCAST:
l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
break;
case IFA_LABEL:
l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
break;
default:
break;
}
}
struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + l_nameSize + l_addrSize);
memset(l_entry, 0, sizeof(struct ifaddrs));
l_entry->ifa_name = p_links[l_info->ifa_index - 1]->ifa_name;
char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
char *l_addr = l_name + l_nameSize;
l_entry->ifa_flags = l_info->ifa_flags | p_links[l_info->ifa_index - 1]->ifa_flags;
l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
void *l_rtaData = RTA_DATA(l_rta);
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFA_ADDRESS:
case IFA_BROADCAST:
case IFA_LOCAL:
{
size_t l_addrLen = calcAddrLen(l_info->ifa_family, l_rtaDataSize);
makeSockaddr(l_info->ifa_family, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
if(l_info->ifa_family == AF_INET6)
{
if(IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)l_rtaData) || IN6_IS_ADDR_MC_LINKLOCAL((struct in6_addr *)l_rtaData))
{
((struct sockaddr_in6 *)l_addr)->sin6_scope_id = l_info->ifa_index;
}
}
if(l_rta->rta_type == IFA_ADDRESS)
{ // apparently in a point-to-point network IFA_ADDRESS contains the dest address and IFA_LOCAL contains the local address
if(l_entry->ifa_addr)
{
l_entry->ifa_dstaddr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
}
else if(l_rta->rta_type == IFA_LOCAL)
{
if(l_entry->ifa_addr)
{
l_entry->ifa_dstaddr = l_entry->ifa_addr;
}
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
}
l_addr += NLMSG_ALIGN(l_addrLen);
break;
}
case IFA_LABEL:
strncpy(l_name, l_rtaData, l_rtaDataSize);
l_name[l_rtaDataSize] = '\0';
l_entry->ifa_name = l_name;
break;
default:
break;
}
}
if(l_entry->ifa_addr && (l_entry->ifa_addr->sa_family == AF_INET || l_entry->ifa_addr->sa_family == AF_INET6))
{
unsigned l_maxPrefix = (l_entry->ifa_addr->sa_family == AF_INET ? 32 : 128);
unsigned l_prefix = (l_info->ifa_prefixlen > l_maxPrefix ? l_maxPrefix : l_info->ifa_prefixlen);
char l_mask[16] = {0};
unsigned i;
for(i=0; i<(l_prefix/8); ++i)
{
l_mask[i] = 0xff;
}
if (l_prefix % 8) {
l_mask[i] = 0xff << (8 - (l_prefix % 8));
}
makeSockaddr(l_entry->ifa_addr->sa_family, (struct sockaddr *)l_addr, l_mask, l_maxPrefix / 8);
l_entry->ifa_netmask = (struct sockaddr *)l_addr;
}
addToEnd(p_resultList, l_entry);
}
static void interpret(int p_socket, NetlinkList *p_netlinkList, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
{
pid_t l_pid = getpid();
for(; p_netlinkList; p_netlinkList = p_netlinkList->m_next)
{
unsigned int l_nlsize = p_netlinkList->m_size;
struct nlmsghdr *l_hdr;
for(l_hdr = p_netlinkList->m_data; NLMSG_OK(l_hdr, l_nlsize); l_hdr = NLMSG_NEXT(l_hdr, l_nlsize))
{
if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
{
continue;
}
if(l_hdr->nlmsg_type == NLMSG_DONE)
{
break;
}
if(l_hdr->nlmsg_type == RTM_NEWLINK)
{
interpretLink(l_hdr, p_links, p_resultList);
}
else if(l_hdr->nlmsg_type == RTM_NEWADDR)
{
interpretAddr(l_hdr, p_links, p_resultList);
}
}
}
}
static unsigned countLinks(int p_socket, NetlinkList *p_netlinkList)
{
unsigned l_links = 0;
pid_t l_pid = getpid();
for(; p_netlinkList; p_netlinkList = p_netlinkList->m_next)
{
unsigned int l_nlsize = p_netlinkList->m_size;
struct nlmsghdr *l_hdr;
for(l_hdr = p_netlinkList->m_data; NLMSG_OK(l_hdr, l_nlsize); l_hdr = NLMSG_NEXT(l_hdr, l_nlsize))
{
if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
{
continue;
}
if(l_hdr->nlmsg_type == NLMSG_DONE)
{
break;
}
if(l_hdr->nlmsg_type == RTM_NEWLINK)
{
++l_links;
}
}
}
return l_links;
}
int getifaddrs(struct ifaddrs **ifap)
{
if(!ifap)
{
return -1;
}
*ifap = NULL;
int l_socket = netlink_socket();
if(l_socket < 0)
{
return -1;
}
NetlinkList *l_linkResults = getResultList(l_socket, RTM_GETLINK);
if(!l_linkResults)
{
close(l_socket);
return -1;
}
NetlinkList *l_addrResults = getResultList(l_socket, RTM_GETADDR);
if(!l_addrResults)
{
close(l_socket);
freeResultList(l_linkResults);
return -1;
}
unsigned l_numLinks = countLinks(l_socket, l_linkResults) + countLinks(l_socket, l_addrResults);
struct ifaddrs *l_links[l_numLinks];
memset(l_links, 0, l_numLinks * sizeof(struct ifaddrs *));
interpret(l_socket, l_linkResults, l_links, ifap);
interpret(l_socket, l_addrResults, l_links, ifap);
freeResultList(l_linkResults);
freeResultList(l_addrResults);
close(l_socket);
return 0;
}
void freeifaddrs(struct ifaddrs *ifa)
{
struct ifaddrs *l_cur;
while(ifa)
{
l_cur = ifa;
ifa = ifa->ifa_next;
free(l_cur);
}
}
src/lxc/tools/include/ifaddrs.h deleted 100644 → 0
/*
* Copyright (c) 1995, 1999
* Berkeley Software Design, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* BSDI ifaddrs.h,v 2.5 2000/02/23 14:51:59 dab Exp
*/
#ifndef _IFADDRS_H_
#define _IFADDRS_H_
struct ifaddrs {
struct ifaddrs *ifa_next;
char *ifa_name;
unsigned int ifa_flags;
struct sockaddr *ifa_addr;
struct sockaddr *ifa_netmask;
struct sockaddr *ifa_dstaddr;
void *ifa_data;
};
/*
* This may have been defined in <net/if.h>. Note that if <net/if.h> is
* to be included it must be included before this header file.
*/
#ifndef ifa_broadaddr
#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
#endif
#include <sys/cdefs.h>
__BEGIN_DECLS
extern int getifaddrs(struct ifaddrs **ifap);
extern void freeifaddrs(struct ifaddrs *ifa);
__END_DECLS
#endif
src/lxc/tools/lxc_device.c
......@@ -36,7 +36,7 @@
#if HAVE_IFADDRS_H
#include <ifaddrs.h>
#else
#include "include/ifaddrs.h"
#include "../include/ifaddrs.h"
#endif
lxc_log_define(lxc_device, lxc);
......
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