diff options
Diffstat (limited to 'package/network/ipv6/464xlat/src/464xlatcfg.c')
| -rw-r--r-- | package/network/ipv6/464xlat/src/464xlatcfg.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/package/network/ipv6/464xlat/src/464xlatcfg.c b/package/network/ipv6/464xlat/src/464xlatcfg.c new file mode 100644 index 0000000000..288733e199 --- /dev/null +++ b/package/network/ipv6/464xlat/src/464xlatcfg.c @@ -0,0 +1,154 @@ +/* 464xlatcfg.c + * + * Copyright (c) 2015 Steven Barth <cyrus@openwrt.org> + * Copyright (c) 2017 Hans Dedecker <dedeckeh@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <netinet/icmp6.h> +#include <netinet/in.h> +#include <sys/socket.h> +#include <arpa/inet.h> +#include <net/if.h> +#include <unistd.h> +#include <stdlib.h> +#include <signal.h> +#include <stdio.h> +#include <netdb.h> + +static void sighandler(__attribute__((unused)) int signal) +{ +} + +int main(int argc, const char *argv[]) +{ + char buf[INET6_ADDRSTRLEN], prefix[INET6_ADDRSTRLEN + 4]; + int pid; + + if (argc <= 1) { + fprintf(stderr, "Usage: %s <name> [ifname] [ipv6prefix] [ipv4addr] [ipv6addr]\n", argv[0]); + return 1; + } + + snprintf(buf, sizeof(buf), "/var/run/%s.pid", argv[1]); + FILE *fp = fopen(buf, "r"); + if (fp) { + if (fscanf(fp, "%d", &pid) == 1) + kill(pid, SIGTERM); + + unlink(buf); + fclose(fp); + } + + if (!argv[2]) + return 0; + + if (!argv[3] || !argv[4] || !(fp = fopen(buf, "wx"))) + return 1; + + signal(SIGTERM, SIG_DFL); + setvbuf(fp, NULL, _IOLBF, 0); + fprintf(fp, "%d\n", getpid()); + + prefix[sizeof(prefix) - 1] = 0; + strncpy(prefix, argv[3], sizeof(prefix) - 1); + + if (!prefix[0]) { + struct addrinfo hints = { .ai_family = AF_INET6 }, *res; + if (getaddrinfo("ipv4only.arpa", NULL, &hints, &res) || !res) { + sleep(3); + if (getaddrinfo("ipv4only.arpa", NULL, &hints, &res) || !res) + return 2; + } + + struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)res->ai_addr; + inet_ntop(AF_INET6, &sin6->sin6_addr, prefix, sizeof(prefix) - 4); + strcat(prefix, "/96"); + freeaddrinfo(res); + } + + int i = 0; + int sock; + struct sockaddr_in6 saddr; + + do { + socklen_t saddrlen = sizeof(saddr); + struct icmp6_filter filt; + + sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); + ICMP6_FILTER_SETBLOCKALL(&filt); + setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, sizeof(filt)); + setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, argv[2], strlen(argv[2])); + memset(&saddr, 0, sizeof(saddr)); + saddr.sin6_family = AF_INET6; + saddr.sin6_addr.s6_addr32[0] = htonl(0x2001); + saddr.sin6_addr.s6_addr32[1] = htonl(0xdb8); + if (connect(sock, (struct sockaddr*)&saddr, sizeof(saddr)) || + getsockname(sock, (struct sockaddr*)&saddr, &saddrlen)) + return 3; + + if (!IN6_IS_ADDR_LINKLOCAL(&saddr.sin6_addr) || argv[5]) + break; + + close(sock); + sleep(3); + i++; + } while (i < 3); + + struct ipv6_mreq mreq = {saddr.sin6_addr, if_nametoindex(argv[2])}; + if (!argv[5]) { + if (IN6_IS_ADDR_LINKLOCAL(&mreq.ipv6mr_multiaddr)) + return 5; + + srandom(mreq.ipv6mr_multiaddr.s6_addr32[0] ^ mreq.ipv6mr_multiaddr.s6_addr32[1] ^ + mreq.ipv6mr_multiaddr.s6_addr32[2] ^ mreq.ipv6mr_multiaddr.s6_addr32[3]); + mreq.ipv6mr_multiaddr.s6_addr32[2] = random(); + mreq.ipv6mr_multiaddr.s6_addr32[3] = random(); + } else if (inet_pton(AF_INET6, argv[5], &mreq.ipv6mr_multiaddr) != 1) { + return 1; + } + + if (setsockopt(sock, SOL_IPV6, IPV6_JOIN_ANYCAST, &mreq, sizeof(mreq))) + return 3; + + inet_ntop(AF_INET6, &mreq.ipv6mr_multiaddr, buf, sizeof(buf)); + fputs(buf, stdout); + fputc('\n', stdout); + fflush(stdout); + + FILE *nat46 = fopen("/proc/net/nat46/control", "w"); + if (!nat46 || fprintf(nat46, "add %s\nconfig %s local.style NONE local.v4 %s/32 local.v6 %s/128 " + "remote.style RFC6052 remote.v6 %s\n", argv[1], argv[1], argv[4], buf, prefix) < 0 || + fclose(nat46)) + return 4; + + if (!(pid = fork())) { + fclose(fp); + fclose(stdin); + fclose(stdout); + fclose(stderr); + chdir("/"); + setsid(); + signal(SIGTERM, sighandler); + pause(); + + nat46 = fopen("/proc/net/nat46/control", "w"); + if (nat46) { + fprintf(nat46, "del %s\n", argv[1]); + fclose(nat46); + } + } else { + rewind(fp); + fprintf(fp, "%d\n", pid); + } + + return 0; +} |