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#include "common/netif.h"
#include "common/io.h"
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define ROUNDUP2(a, n) ((a) > 0 ? (1 + (((a) - 1U) | ((n) - 1))) : (n))
#if __APPLE__
// https://github.com/apple-oss-distributions/network_cmds/blob/8f38231438e6a4d16ef8015e97e12c2c05105644/rtsol.tproj/if.c#L243
#define ROUNDUP(a) ROUNDUP2((a), sizeof(uint32_t))
#elif __sun
// https://github.com/illumos/illumos-gate/blob/95b8c88950fa7b19af46bc63230137cf96b0bff7/usr/src/cmd/cmd-inet/usr.sbin/route.c#L339
#define ROUNDUP(a) ROUNDUP2((a), sizeof(long))
#else
#error unknown platform
#endif
static struct sockaddr*
get_rt_address(struct rt_msghdr* rtm, int desired) {
struct sockaddr* sa = (struct sockaddr*) (rtm + 1);
for (int i = 0; i < RTAX_MAX; i++) {
if (rtm->rtm_addrs & (1 << i)) {
if ((1 << i) == desired) {
return sa;
}
#ifndef __sun
uint32_t salen = sa->sa_len;
#else
uint32_t salen;
// https://github.com/illumos/illumos-gate/blob/95b8c88950fa7b19af46bc63230137cf96b0bff7/usr/src/cmd/cmd-inet/usr.sbin/route.c#L2941
switch (sa->sa_family) {
case AF_INET:
salen = sizeof(struct sockaddr_in);
break;
case AF_LINK:
salen = sizeof(struct sockaddr_dl);
break;
case AF_INET6:
salen = sizeof(struct sockaddr_in6);
break;
default:
salen = sizeof(struct sockaddr);
break;
}
#endif
sa = (struct sockaddr*) (ROUNDUP(salen) + (char*) sa);
}
}
return NULL;
}
bool ffNetifGetDefaultRouteImplV4(FFNetifDefaultRouteResult* result) {
// https://github.com/hashPirate/copenheimer-masscan-fork/blob/36f1ed9f7b751a7dccd5ed27874e2e703db7d481/src/rawsock-getif.c#L104
FF_AUTO_CLOSE_FD int pfRoute = socket(PF_ROUTE, SOCK_RAW, AF_INET);
if (pfRoute < 0) {
return false;
}
{
struct timeval timeout = { 1, 0 };
setsockopt(pfRoute, SOL_SOCKET, SO_RCVTIMEO, (char*) &timeout, sizeof(timeout));
setsockopt(pfRoute, SOL_SOCKET, SO_SNDTIMEO, (char*) &timeout, sizeof(timeout));
}
uint32_t pid = instance.state.platform.pid;
struct {
struct rt_msghdr hdr;
struct sockaddr_in dst;
uint8_t data[512];
} rtmsg = {
.hdr = {
.rtm_type = RTM_GET,
.rtm_flags = RTF_UP | RTF_GATEWAY,
.rtm_version = RTM_VERSION,
.rtm_addrs = RTA_DST | RTA_IFP | RTA_IFA,
.rtm_msglen = sizeof(rtmsg.hdr) + sizeof(rtmsg.dst),
.rtm_pid = (pid_t) pid,
.rtm_seq = 1,
},
.dst = {
.sin_family = AF_INET,
#ifndef __sun
.sin_len = sizeof(rtmsg.dst),
#endif
},
};
if (send(pfRoute, &rtmsg, rtmsg.hdr.rtm_msglen, 0) != rtmsg.hdr.rtm_msglen) {
return false;
}
bool gotResponse = false;
while (recv(pfRoute, &rtmsg, sizeof(rtmsg), 0) > 0) {
if (rtmsg.hdr.rtm_seq == 1 && rtmsg.hdr.rtm_pid == (pid_t) pid) {
gotResponse = true;
break;
}
}
if (!gotResponse) {
return false;
}
#ifndef __sun // On Solaris, the RTF_GATEWAY flag is not set for default routes for some reason
if ((rtmsg.hdr.rtm_flags & (RTF_UP | RTF_GATEWAY)) == (RTF_UP | RTF_GATEWAY))
#endif
{
struct sockaddr_dl* sdl = (struct sockaddr_dl*) get_rt_address(&rtmsg.hdr, RTA_IFP);
if (sdl
#ifndef __sun
&& sdl->sdl_len
#endif
&& sdl->sdl_family == AF_LINK) {
if (sdl->sdl_nlen > IF_NAMESIZE) {
return false;
}
memcpy(result->ifName, sdl->sdl_data, sdl->sdl_nlen);
result->ifName[sdl->sdl_nlen] = '\0';
result->ifIndex = sdl->sdl_index;
// Get the preferred source address
struct sockaddr_in* src = (struct sockaddr_in*) get_rt_address(&rtmsg.hdr, RTA_IFA);
if (src && src->sin_family == AF_INET) {
result->preferredSourceAddrV4 = src->sin_addr.s_addr;
}
return true;
}
return false;
}
return false;
}
bool ffNetifGetDefaultRouteImplV6(FFNetifDefaultRouteResult* result) {
// https://github.com/hashPirate/copenheimer-masscan-fork/blob/36f1ed9f7b751a7dccd5ed27874e2e703db7d481/src/rawsock-getif.c#L104
FF_AUTO_CLOSE_FD int pfRoute = socket(PF_ROUTE, SOCK_RAW, AF_INET6);
if (pfRoute < 0) {
return false;
}
{
struct timeval timeout = { 1, 0 };
setsockopt(pfRoute, SOL_SOCKET, SO_RCVTIMEO, (char*) &timeout, sizeof(timeout));
setsockopt(pfRoute, SOL_SOCKET, SO_SNDTIMEO, (char*) &timeout, sizeof(timeout));
}
uint32_t pid = instance.state.platform.pid;
struct {
struct rt_msghdr hdr;
struct sockaddr_in6 dst;
uint8_t data[512];
} rtmsg = {
.hdr = {
.rtm_type = RTM_GET,
.rtm_flags = RTF_UP | RTF_GATEWAY,
.rtm_version = RTM_VERSION,
.rtm_addrs = RTA_DST | RTA_IFP,
.rtm_msglen = sizeof(rtmsg.hdr) + sizeof(rtmsg.dst),
.rtm_pid = (pid_t) pid,
.rtm_seq = 2,
},
.dst = {
.sin6_family = AF_INET6,
#ifndef __sun
.sin6_len = sizeof(rtmsg.dst),
#endif
},
};
if (send(pfRoute, &rtmsg, rtmsg.hdr.rtm_msglen, 0) != rtmsg.hdr.rtm_msglen) {
return false;
}
bool gotResponse = false;
while (recv(pfRoute, &rtmsg, sizeof(rtmsg), 0) > 0) {
if (rtmsg.hdr.rtm_seq == 2 && rtmsg.hdr.rtm_pid == (pid_t) pid) {
gotResponse = true;
break;
}
}
if (!gotResponse) {
return false;
}
#ifndef __sun // On Solaris, the RTF_GATEWAY flag is not set for default routes for some reason
if ((rtmsg.hdr.rtm_flags & (RTF_UP | RTF_GATEWAY)) == (RTF_UP | RTF_GATEWAY))
#endif
{
struct sockaddr_dl* sdl = (struct sockaddr_dl*) get_rt_address(&rtmsg.hdr, RTA_IFP);
if (sdl
#ifndef __sun
&& sdl->sdl_len
#endif
&& sdl->sdl_family == AF_LINK) {
if (sdl->sdl_nlen > IF_NAMESIZE) {
return false;
}
memcpy(result->ifName, sdl->sdl_data, sdl->sdl_nlen);
result->ifName[sdl->sdl_nlen] = '\0';
result->ifIndex = sdl->sdl_index;
return true;
}
return false;
}
return false;
}
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