int main(int unused_argc, char **argv) { INET_ADDR_LIST addr_list; INET_ADDR_LIST mask_list; MAI_HOSTADDR_STR hostaddr; MAI_HOSTADDR_STR hostmask; struct sockaddr *sa; int i; INET_PROTO_INFO *proto_info; msg_vstream_init(argv[0], VSTREAM_ERR); msg_verbose = 1; proto_info = inet_proto_init(argv[0], argv[1] ? argv[1] : INET_PROTO_NAME_ALL); inet_addr_list_init(&addr_list); inet_addr_list_init(&mask_list); inet_addr_local(&addr_list, &mask_list, proto_info->ai_family_list); if (addr_list.used == 0) msg_fatal("cannot find any active network interfaces"); if (addr_list.used == 1) msg_warn("found only one active network interface"); for (i = 0; i < addr_list.used; i++) { sa = SOCK_ADDR_PTR(addr_list.addrs + i); SOCKADDR_TO_HOSTADDR(SOCK_ADDR_PTR(sa), SOCK_ADDR_LEN(sa), &hostaddr, (MAI_SERVPORT_STR *) 0, 0); sa = SOCK_ADDR_PTR(mask_list.addrs + i); SOCKADDR_TO_HOSTADDR(SOCK_ADDR_PTR(sa), SOCK_ADDR_LEN(sa), &hostmask, (MAI_SERVPORT_STR *) 0, 0); vstream_printf("%s/%s\n", hostaddr.buf, hostmask.buf); vstream_fflush(VSTREAM_OUT); } inet_addr_list_free(&addr_list); inet_addr_list_free(&mask_list); return (0); }
static void own_inet_addr_init(INET_ADDR_LIST *addr_list, INET_ADDR_LIST *mask_list) { INET_ADDR_LIST local_addrs; INET_ADDR_LIST local_masks; char *hosts; char *host; const char *sep = " \t,"; char *bufp; int nvirtual; int nlocal; MAI_HOSTADDR_STR hostaddr; struct sockaddr_storage *sa; struct sockaddr_storage *ma; inet_addr_list_init(addr_list); inet_addr_list_init(mask_list); /* * If we are listening on all interfaces (default), ask the system what * the interfaces are. */ if (strcmp(var_inet_interfaces, INET_INTERFACES_ALL) == 0) { if (inet_addr_local(addr_list, mask_list, inet_proto_info()->ai_family_list) == 0) msg_fatal("could not find any active network interfaces"); } /* * Select all loopback interfaces from the system's available interface * list. */ else if (strcmp(var_inet_interfaces, INET_INTERFACES_LOCAL) == 0) { inet_addr_list_init(&local_addrs); inet_addr_list_init(&local_masks); if (inet_addr_local(&local_addrs, &local_masks, inet_proto_info()->ai_family_list) == 0) msg_fatal("could not find any active network interfaces"); for (sa = local_addrs.addrs, ma = local_masks.addrs; sa < local_addrs.addrs + local_addrs.used; sa++, ma++) { if (sock_addr_in_loopback(SOCK_ADDR_PTR(sa))) { inet_addr_list_append(addr_list, SOCK_ADDR_PTR(sa)); inet_addr_list_append(mask_list, SOCK_ADDR_PTR(ma)); } } inet_addr_list_free(&local_addrs); inet_addr_list_free(&local_masks); } /* * If we are supposed to be listening only on specific interface * addresses (virtual hosting), look up the addresses of those * interfaces. */ else { bufp = hosts = mystrdup(var_inet_interfaces); while ((host = mystrtok(&bufp, sep)) != 0) if (inet_addr_host(addr_list, host) == 0) msg_fatal("config variable %s: host not found: %s", VAR_INET_INTERFACES, host); myfree(hosts); /* * Weed out duplicate IP addresses. Duplicates happen when the same * IP address is listed under multiple hostnames. If we don't weed * out duplicates, Postfix can suddenly stop working after the DNS is * changed. */ inet_addr_list_uniq(addr_list); /* * Find out the netmask for each virtual interface, by looking it up * among all the local interfaces. */ inet_addr_list_init(&local_addrs); inet_addr_list_init(&local_masks); if (inet_addr_local(&local_addrs, &local_masks, inet_proto_info()->ai_family_list) == 0) msg_fatal("could not find any active network interfaces"); for (nvirtual = 0; nvirtual < addr_list->used; nvirtual++) { for (nlocal = 0; /* see below */ ; nlocal++) { if (nlocal >= local_addrs.used) { SOCKADDR_TO_HOSTADDR( SOCK_ADDR_PTR(addr_list->addrs + nvirtual), SOCK_ADDR_LEN(addr_list->addrs + nvirtual), &hostaddr, (MAI_SERVPORT_STR *) 0, 0); msg_fatal("parameter %s: no local interface found for %s", VAR_INET_INTERFACES, hostaddr.buf); } if (SOCK_ADDR_EQ_ADDR(addr_list->addrs + nvirtual, local_addrs.addrs + nlocal)) { inet_addr_list_append(mask_list, SOCK_ADDR_PTR(local_masks.addrs + nlocal)); break; } } } inet_addr_list_free(&local_addrs); inet_addr_list_free(&local_masks); } }