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-rw-r--r--src/config.c316
1 files changed, 316 insertions, 0 deletions
diff --git a/src/config.c b/src/config.c
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+++ b/src/config.c
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+/*
+ Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net>
+ Partly based on QuickTun Copyright (c) 2010, Ivo Smits <Ivo@UCIS.nl>.
+ 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 <config.ll.h>
+#include <config.yy.h>
+
+#include <config.h>
+
+#include <arpa/inet.h>
+#include <stdarg.h>
+
+
+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");
+}
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