From 4ffc28ecd6d914f9c1e5aaf5d5921ee4827bb289 Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Sat, 24 Mar 2012 20:55:27 +0100 Subject: Partial implementation of a config files parser --- src/config.c | 316 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 316 insertions(+) create mode 100644 src/config.c (limited to 'src/config.c') diff --git a/src/config.c b/src/config.c new file mode 100644 index 0000000..18fe120 --- /dev/null +++ b/src/config.c @@ -0,0 +1,316 @@ +/* + Copyright (c) 2012, Matthias Schiffer + Partly based on QuickTun Copyright (c) 2010, Ivo Smits . + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + + +#include "fastd.h" +#include "peer.h" +#include +#include + +#include + +#include +#include + + +extern fastd_method fastd_method_null; + +#ifdef WITH_METHOD_ECFXP +extern fastd_method fastd_method_ec25519_fhmqvc_xsalsa20_poly1305; +#endif + + +static void default_config(fastd_config *conf) { + conf->loglevel = LOG_DEBUG; + + conf->peer_stale_time = 300; + conf->peer_stale_time_temp = 30; + conf->eth_addr_stale_time = 300; + + conf->ifname = NULL; + + memset(&conf->bind_addr_in, 0, sizeof(struct sockaddr_in)); + conf->bind_addr_in.sin_family = AF_UNSPEC; + conf->bind_addr_in.sin_port = 0; + conf->bind_addr_in.sin_addr.s_addr = htonl(INADDR_ANY); + + memset(&conf->bind_addr_in6, 0, sizeof(struct sockaddr_in6)); + conf->bind_addr_in6.sin6_family = AF_UNSPEC; + conf->bind_addr_in6.sin6_port = 0; + conf->bind_addr_in6.sin6_addr = in6addr_any; + + conf->mtu = 1500; + conf->mode = MODE_TAP; + conf->method = &fastd_method_null; + conf->peers = NULL; +} + +static bool config_match(const char *opt, ...) { + va_list ap; + bool match = false; + const char *str; + + va_start(ap, opt); + + while((str = va_arg(ap, const char*)) != NULL) { + if (strcmp(opt, str) == 0) { + match = true; + break; + } + } + + va_end(ap); + + return match; +} + +static void fastd_read_config(fastd_context *ctx, fastd_config *conf, const char *filename) { + yyscan_t scanner; + FILE *file; + + file = fopen(filename, "r"); + fastd_config_lex_init(&scanner); + + fastd_config_set_in(file, scanner); + + fastd_config_parse(ctx, conf, scanner); + + fastd_config_lex_destroy(scanner); + fclose(file); +} + +#define IF_OPTION(args...) if(config_match(argv[i], args, NULL) && (++i)) +#define IF_OPTION_ARG(args...) if(config_match(argv[i], args, NULL) && ({ \ + arg = argv[i+1]; \ + i+=2; \ + if (i > argc) \ + exit_error(ctx, "config error: option `%s' needs an argument", argv[i-2]); \ + true; \ + })) +#define IGNORE_OPTION (i++) + +void fastd_configure(fastd_context *ctx, fastd_config *conf, int argc, char *const argv[]) { + default_config(conf); + + fastd_peer_config **current_peer = &conf->peers; + + int i = 1; + const char *arg; + long l; + char *charptr; + char *endptr; + char *addrstr; + + bool v4_peers = false, v6_peers = false; + + + conf->n_floating = 0; + + + while (i < argc) { + IF_OPTION_ARG("-c", "--config") { + fastd_read_config(ctx, conf, arg); + continue; + } + + IF_OPTION_ARG("-i", "--interface") { + conf->ifname = arg; + continue; + } + + IF_OPTION_ARG("-b", "--bind") { + if (arg[0] == '[') { + charptr = strchr(arg, ']'); + if (!charptr || (charptr[1] != ':' && charptr[1] != '\0')) + exit_error(ctx, "invalid bind address `%s'", arg); + + addrstr = strndup(arg+1, charptr-arg-1); + + if (charptr[1] == ':') + charptr++; + else + charptr = NULL; + } + else { + charptr = strchr(arg, ':'); + if (charptr) { + addrstr = strndup(arg, charptr-arg); + } + else { + addrstr = strdup(arg); + } + } + + if (charptr) { + l = strtol(charptr+1, &endptr, 10); + if (*endptr || l > 65535) + exit_error(ctx, "invalid bind port `%s'", charptr+1); + } + + if (strcmp(addrstr, "any") == 0) { + conf->bind_addr_in.sin_addr.s_addr = htonl(INADDR_ANY); + conf->bind_addr_in.sin_port = htons(l); + + conf->bind_addr_in6.sin6_addr = in6addr_any; + conf->bind_addr_in6.sin6_port = htons(l); + } + else if (arg[0] == '[') { + conf->bind_addr_in6.sin6_family = AF_INET6; + if (inet_pton(AF_INET6, addrstr, &conf->bind_addr_in6.sin6_addr) != 1) + exit_error(ctx, "invalid bind address `%s'", addrstr); + conf->bind_addr_in6.sin6_port = htons(l); + } + else { + conf->bind_addr_in.sin_family = AF_INET; + if (inet_pton(AF_INET, addrstr, &conf->bind_addr_in.sin_addr) != 1) + exit_error(ctx, "invalid bind address `%s'", addrstr); + conf->bind_addr_in.sin_port = htons(l); + } + + free(addrstr); + + continue; + } + + IF_OPTION_ARG("-M", "--mtu") { + conf->mtu = strtol(arg, &endptr, 10); + if (*endptr || conf->mtu < 576) + exit_error(ctx, "invalid mtu `%s'", arg); + continue; + } + + IF_OPTION_ARG("-m", "--mode") { + if (!strcmp(arg, "tap")) + conf->mode = MODE_TAP; + else if (!strcmp(arg, "tun")) + conf->mode = MODE_TUN; + else + exit_error(ctx, "invalid mode `%s'", arg); + continue; + } + + + IF_OPTION_ARG("-P", "--protocol") { + if (!strcmp(arg, "null")) + conf->method = &fastd_method_null; +#ifdef WITH_METHOD_ECFXP + if (!strcmp(arg, "ecfxp")) + conf->method = &fastd_method_ec25519_fhmqvc_xsalsa20_poly1305; +#endif + else + exit_error(ctx, "invalid protocol `%s'", arg); + continue; + } + + IF_OPTION_ARG("-p", "--peer") { + *current_peer = malloc(sizeof(fastd_peer_config)); + (*current_peer)->next = NULL; + + memset(&(*current_peer)->address, 0, sizeof(fastd_peer_address)); + if (strcmp(arg, "float") == 0) { + (*current_peer)->address.sa.sa_family = AF_UNSPEC; + conf->n_floating++; + continue; + } + + if (arg[0] == '[') { + charptr = strchr(arg, ']'); + if (!charptr || (charptr[1] != ':' && charptr[1] != '\0')) + exit_error(ctx, "invalid peer address `%s'", arg); + + addrstr = strndup(arg+1, charptr-arg-1); + + if (charptr[1] == ':') + charptr++; + else + charptr = NULL; + } + else { + charptr = strchr(arg, ':'); + if (charptr) + addrstr = strndup(arg, charptr-arg); + else + addrstr = strdup(arg); + } + + if (charptr) { + l = strtol(charptr+1, &endptr, 10); + if (*endptr || l > 65535) + exit_error(ctx, "invalid peer port `%s'", charptr+1); + } + else { + l = 1337; /* default port */ + } + + if (arg[0] == '[') { + v6_peers = true; + (*current_peer)->address.in6.sin6_family = AF_INET6; + if (inet_pton(AF_INET6, addrstr, &(*current_peer)->address.in6.sin6_addr) != 1) + exit_error(ctx, "invalid peer address `%s'", addrstr); + (*current_peer)->address.in6.sin6_port = htons(l); + } + else { + v4_peers = true; + (*current_peer)->address.in.sin_family = AF_INET; + if (inet_pton(AF_INET, addrstr, &(*current_peer)->address.in.sin_addr) != 1) + exit_error(ctx, "invalid peer address `%s'", addrstr); + (*current_peer)->address.in.sin_port = htons(l); + } + + free(addrstr); + + current_peer = &(*current_peer)->next; + + continue; + } + + exit_error(ctx, "config error: unknown option `%s'", argv[i]); + } + + if (conf->n_floating && conf->bind_addr_in.sin_family == AF_UNSPEC + && conf->bind_addr_in6.sin6_family == AF_UNSPEC) { + conf->bind_addr_in.sin_family = AF_INET; + conf->bind_addr_in6.sin6_family = AF_INET6; + } + else if (v4_peers) { + conf->bind_addr_in.sin_family = AF_INET; + } + else if (v6_peers) { + conf->bind_addr_in6.sin6_family = AF_INET6; + } + + bool ok = true; + if (conf->mode == MODE_TUN && (!conf->peers || conf->peers->next)) { + pr_error(ctx, "for tun mode exactly one peer must be configured"); + ok = false; + } + + if (ok) + ok = conf->method->check_config(ctx, conf); + + if (!ok) + exit_error(ctx, "config error"); +} -- cgit v1.2.3