2 * mono-route.c: Read the network routing tables using sysctl(3) calls
3 * Required for Unix-like systems that don't have Linux's /proc/net/route
6 * Ben Woods (woodsb02@gmail.com)
9 #if defined(PLATFORM_MACOSX) || defined(PLATFORM_BSD)
11 #include <sys/socket.h>
13 #include <net/if_dl.h>
14 #include <net/route.h>
15 #include <netinet/in.h>
16 #include <sys/param.h>
17 #include <sys/sysctl.h>
20 #include <mono/metadata/object.h>
21 #include <mono/metadata/mono-route.h>
23 extern MonoBoolean ves_icall_System_Net_NetworkInformation_MacOsIPInterfaceProperties_ParseRouteInfo_internal(MonoString *iface, MonoArray **gw_addr_list)
28 int num_gws=0, gwnum=0;
29 unsigned int ifindex = 0;
30 char *buf, *next, *lim, *ifacename;
31 struct rt_msghdr *rtm;
33 MonoDomain *domain = mono_domain_get ();
35 ifacename = mono_string_to_utf8(iface);
36 if ((ifindex = if_nametoindex(ifacename)) == 0)
40 // MIB array defining data to read from sysctl
41 mib[0] = CTL_NET; // Networking
42 mib[1] = PF_ROUTE; // Routing messages
43 mib[2] = 0; // Protocol number (always zero)
44 mib[3] = AF_INET; // Address family (IPv4)
45 mib[4] = NET_RT_DUMP; // Dump routing table
48 // First sysctl call with oldp set to NULL to determine size of available data
49 if (sysctl(mib, G_N_ELEMENTS(mib), NULL, &needed, NULL, 0) < 0)
52 // Allocate suffcient memory for available data based on the previous sysctl call
53 if ((buf = malloc(needed)) == NULL)
56 // Second sysctl call to retrieve data into appropriately sized buffer
57 if (sysctl(mib, G_N_ELEMENTS(mib), buf, &needed, NULL, 0) < 0)
61 for (next = buf; next < lim; next += rtm->rtm_msglen) {
62 rtm = (struct rt_msghdr *)next;
63 if (rtm->rtm_version != RTM_VERSION)
65 if (rtm->rtm_index != ifindex)
67 if((in = gateway_from_rtm(rtm)) == 0)
72 *gw_addr_list = mono_array_new(domain, mono_get_string_class (), num_gws);
74 for (next = buf; next < lim; next += rtm->rtm_msglen) {
75 rtm = (struct rt_msghdr *)next;
76 if (rtm->rtm_version != RTM_VERSION)
78 if (rtm->rtm_index != ifindex)
80 if ((in = gateway_from_rtm(rtm)) == 0)
83 MonoString *addr_string;
88 len = snprintf(addr, sizeof(addr), "%u.%u.%u.%u",
89 (unsigned char) ptr [0],
90 (unsigned char) ptr [1],
91 (unsigned char) ptr [2],
92 (unsigned char) ptr [3]);
94 if ((len >= sizeof(addr)) || (len < 0))
95 // snprintf output truncated
98 addr_string = mono_string_new (domain, addr);
99 mono_array_setref (*gw_addr_list, gwnum, addr_string);
106 in_addr_t gateway_from_rtm(struct rt_msghdr *rtm)
111 struct sockaddr *addr = (struct sockaddr *)(rtm + 1);
112 l = roundup(addr->sa_len, sizeof(long)); \
113 gw = (struct sockaddr *)((char *) addr + l); \
115 if (rtm->rtm_addrs & RTA_GATEWAY) {
116 if(gw->sa_family == AF_INET) {
117 struct sockaddr_in *sockin = (struct sockaddr_in *)gw;
118 return(sockin->sin_addr.s_addr);
125 #endif /* #if defined(PLATFORM_MACOSX) || defined(PLATFORM_BSD) */