1 files changed, 124 insertions, 0 deletions
diff --git a/src/common/impl/netif_bsd.c b/src/common/impl/netif_bsd.c
new file mode 100644
index 0000000..2b59c6d
--- /dev/null
+++ b/src/common/impl/netif_bsd.c
@@ -0,0 +1,124 @@
+#include "common/netif.h"
+#include "common/io.h"
+#include "common/mallocHelper.h"
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/route.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+
+#define ROUNDUP2(a, n) ((a) > 0 ? (1 + (((a) - 1U) | ((n) - 1))) : (n))
+
+#if __DragonFly__
+    // https://github.com/DragonFlyBSD/DragonFlyBSD/blob/cf0aa2f1e47a3f0a6055fe427563cb3f3e627064/sys/net/route.h#L315C9-L315C19
+    #define ROUNDUP(a) ROUNDUP2((a), sizeof(long))
+#elif __FreeBSD__
+    // https://github.com/freebsd/freebsd-src/blob/e4c0ecba44b20ebb2e4d80978c2cb6d16b730cb9/sys/net/route.h#L368C9-L368C16
+    #define ROUNDUP(a) ROUNDUP2((a), sizeof(long))
+#elif __NetBSD__
+    // https://github.com/NetBSD/src/blob/29beb637d057520c0ed37ac2cde966f7cc0cadf4/sys/net/route.h#L330
+    #define ROUNDUP(a) ROUNDUP2((a), sizeof(uint64_t))
+#elif __OpenBSD__
+    // https://github.com/openbsd/src/blob/ca647cfa4ec3ccb8360714bc0ebc32a394f7fb6a/regress/sys/netinet/bindconnect/bindconnect.c#L250
+    #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;
+            }
+            sa = (struct sockaddr*) (ROUNDUP(sa->sa_len) + (char*) sa);
+        }
+    }
+    return NULL;
+}
+
+bool ffNetifGetDefaultRouteImplV4(FFNetifDefaultRouteResult* result) {
+    int mib[6] = { CTL_NET, PF_ROUTE, 0, AF_INET, NET_RT_FLAGS, RTF_GATEWAY };
+    size_t needed;
+
+    if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0 || needed == 0) {
+        return false;
+    }
+
+    FF_AUTO_FREE char* buf = malloc(needed);
+
+    if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
+        return false;
+    }
+
+    char* lim = buf + needed;
+    struct rt_msghdr* rtm;
+    for (char* next = buf; next < lim; next += rtm->rtm_msglen) {
+        rtm = (struct rt_msghdr*) next;
+        struct sockaddr* sa = (struct sockaddr*) (rtm + 1);
+
+        if ((rtm->rtm_flags & RTF_GATEWAY) && !(rtm->rtm_flags & RTF_REJECT) && (sa->sa_family == AF_INET)) {
+            struct sockaddr_dl* sdl = (struct sockaddr_dl*) get_rt_address(rtm, RTA_IFP);
+            if (sdl && sdl->sdl_family == AF_LINK) {
+                if (sdl->sdl_nlen > IF_NAMESIZE) {
+                    continue;
+                }
+                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(rtm, RTA_IFA);
+                if (src && src->sin_family == AF_INET) {
+                    result->preferredSourceAddrV4 = src->sin_addr.s_addr;
+                }
+
+                return true;
+            }
+        }
+    }
+    return false;
+}
+
+bool ffNetifGetDefaultRouteImplV6(FFNetifDefaultRouteResult* result) {
+    int mib[6] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_FLAGS, RTF_GATEWAY };
+    size_t needed;
+
+    if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0 || needed == 0) {
+        return false;
+    }
+
+    FF_AUTO_FREE char* buf = malloc(needed);
+
+    if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
+        return false;
+    }
+
+    char* lim = buf + needed;
+    struct rt_msghdr* rtm;
+    for (char* next = buf; next < lim; next += rtm->rtm_msglen) {
+        rtm = (struct rt_msghdr*) next;
+        struct sockaddr* sa = (struct sockaddr*) (rtm + 1);
+
+        if ((rtm->rtm_flags & RTF_GATEWAY) && !(rtm->rtm_flags & RTF_REJECT) && (sa->sa_family == AF_INET6)) {
+            struct sockaddr_dl* sdl = (struct sockaddr_dl*) get_rt_address(rtm, RTA_IFP);
+            if (sdl && sdl->sdl_family == AF_LINK) {
+                if (sdl->sdl_nlen > IF_NAMESIZE) {
+                    continue;
+                }
+                memcpy(result->ifName, sdl->sdl_data, sdl->sdl_nlen);
+                result->ifName[sdl->sdl_nlen] = '\0';
+                result->ifIndex = sdl->sdl_index;
+
+                return true;
+            }
+        }
+    }
+
+    return false;
+}