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-rw-r--r--src/common/impl/netif_apple.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/src/common/impl/netif_apple.c b/src/common/impl/netif_apple.c
new file mode 100644
index 0000000..2d42735
--- /dev/null
+++ b/src/common/impl/netif_apple.c
@@ -0,0 +1,218 @@
+#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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