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-rw-r--r--src/dhcp_config.c354
1 files changed, 354 insertions, 0 deletions
diff --git a/src/dhcp_config.c b/src/dhcp_config.c
new file mode 100644
index 0000000..28d050c
--- /dev/null
+++ b/src/dhcp_config.c
@@ -0,0 +1,354 @@
+/*
+ * OpenWFD - Open-Source Wifi-Display Implementation
+ *
+ * Copyright (c) 2013 David Herrmann <dh.herrmann@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <getopt.h>
+#include <netinet/in.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include "dhcp.h"
+
+#define LONG_OPT_OFFSET 10000
+
+enum {
+ OPT_HELP,
+ OPT_VERBOSE,
+ OPT_SILENT,
+ OPT_DEBUG,
+
+ OPT_CLIENT,
+ OPT_SERVER,
+
+ OPT_INTERFACE,
+ OPT_IP_BINARY,
+
+ OPT_LOCAL,
+ OPT_GATEWAY,
+ OPT_DNS,
+ OPT_SUBNET,
+ OPT_IP_FROM,
+ OPT_IP_TO,
+};
+
+const char short_options[] = ":hvcsi:";
+
+#define OPT(_name, _arg, _val) \
+ { .name = _name, .has_arg = _arg, .val = LONG_OPT_OFFSET + _val }
+const struct option long_options[] = {
+ OPT("help", 0, OPT_HELP),
+ OPT("verbose", 0, OPT_VERBOSE),
+ OPT("silent", 0, OPT_SILENT),
+ OPT("debug", 0, OPT_DEBUG),
+
+ OPT("client", 0, OPT_CLIENT),
+ OPT("server", 0, OPT_SERVER),
+
+ OPT("interface", 1, OPT_INTERFACE),
+ OPT("ip-binary", 1, OPT_IP_BINARY),
+
+ OPT("local", 1, OPT_LOCAL),
+ OPT("gateway", 1, OPT_GATEWAY),
+ OPT("dns", 1, OPT_DNS),
+ OPT("subnet", 1, OPT_SUBNET),
+ OPT("ip-from", 1, OPT_IP_FROM),
+ OPT("ip-to", 1, OPT_IP_TO),
+
+ OPT(NULL, 0, 0),
+};
+#undef OPT
+
+void owfd_dhcp_init_config(struct owfd_dhcp_config *conf)
+{
+ memset(conf, 0, sizeof(*conf));
+}
+
+void owfd_dhcp_clear_config(struct owfd_dhcp_config *conf)
+{
+ free(conf->interface);
+ free(conf->ip_binary);
+
+ free(conf->local);
+ free(conf->gateway);
+ free(conf->dns);
+ free(conf->subnet);
+ free(conf->ip_from);
+ free(conf->ip_to);
+}
+
+static void show_help(void)
+{
+ /*
+ * Usage/Help information
+ * This should be scaled to a maximum of 80 characters per line:
+ *
+ * 80 char line:
+ * | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 |
+ * "12345678901234567890123456789012345678901234567890123456789012345678901234567890\n"
+ * 80 char line starting with tab:
+ * |10| 20 | 30 | 40 | 50 | 60 | 70 | 80 |
+ * "\t901234567890123456789012345678901234567890123456789012345678901234567890\n"
+ */
+ fprintf(stderr,
+ "Usage:\n"
+ "\t%1$s [options]\n"
+ "\t%1$s -h [options]\n"
+ "\n"
+ "All addresses must be given as IPv6 address. If you want to pass an IPv4\n"
+ "address, use '::FFFF:<ipv4>' as usual.\n"
+ "\n"
+ "General Options:\n"
+ "\t-h, --help [off] Print this help and exit\n"
+ "\t-v, --verbose [off] Print verbose messages\n"
+ "\t --debug [off] Enable debug mode\n"
+ "\t --silent [off] Suppress notices and warnings\n"
+ "\n"
+ "Modus Options:\n"
+ "\t-c, --client [off] Run as DHCP client\n"
+ "\t-s, --server [off] Run as DHCP server\n"
+ "\n"
+ "Network Options:\n"
+ "\t-i, --interface <wlan0> [] Wireless interface to run on\n"
+ "\t --ip-binary </path> [%2$s]\n"
+ "\t Path to 'ip' binary\n"
+ "\n"
+ "Server Options:\n"
+ "\t --local <addr> [] Local IPv6 address\n"
+ "\t --gateway <addr> [] Gateway IPv6 address\n"
+ "\t --dns <addr> [] DNS-Server IPv6 address\n"
+ "\t --subnet <mask> [] Subnet mask\n"
+ "\t --ip-from <addr> [] Server IPv6-range start address\n"
+ "\t --ip-to <addr> [] Server IPv6-range end address\n"
+ , "openwfd_dhcp",
+ BUILD_BINDIR_IP "/ip");
+ /*
+ * 80 char line:
+ * | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 |
+ * "12345678901234567890123456789012345678901234567890123456789012345678901234567890\n"
+ * 80 char line starting with tab:
+ * |10| 20 | 30 | 40 | 50 | 60 | 70 | 80 |
+ * "\t901234567890123456789012345678901234567890123456789012345678901234567890\n"
+ */
+}
+
+static int OOM(void)
+{
+ fprintf(stderr, "out of memory\n");
+ return -ENOMEM;
+}
+
+static int verify_address(const char *argname, const char *argval)
+{
+ int r;
+ struct in6_addr addr;
+
+ if (!argval) {
+ fprintf(stderr, "no value given for %s\n", argname);
+ return -EINVAL;
+ }
+
+ r = inet_pton(AF_INET6, argval, &addr);
+ if (r != 1) {
+ fprintf(stderr, "invalid IPv6 address for %s\n", argname);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int owfd_dhcp_parse_argv(struct owfd_dhcp_config *conf, int argc, char **argv)
+{
+ int c;
+ bool help = false;
+ char *t;
+ int r;
+
+ opterr = 0;
+ while (1) {
+ c = getopt_long(argc, argv, short_options, long_options, NULL);
+ if (c <= 0) {
+ break;
+ } else if (c == ':') {
+ fprintf(stderr, "missing argument for: %s\n",
+ argv[optind - 1]);
+ return -EINVAL;
+ } else if (c == '?') {
+ if (optopt && optopt < LONG_OPT_OFFSET)
+ fprintf(stderr, "unknown argument: -%c\n",
+ optopt);
+ else if (!optopt)
+ fprintf(stderr, "unknown argument: %s\n",
+ argv[optind - 1]);
+ else
+ fprintf(stderr, "option takes no arg: %s\n",
+ argv[optind - 1]);
+ return -EINVAL;
+ }
+
+#define OPT(_num) LONG_OPT_OFFSET + _num
+ switch (c) {
+ case 'h':
+ case OPT(OPT_HELP):
+ help = true;
+ break;
+ case 'v':
+ case OPT(OPT_VERBOSE):
+ conf->verbose = 1;
+ break;
+ case OPT(OPT_SILENT):
+ conf->silent = 1;
+ break;
+ case OPT(OPT_DEBUG):
+ conf->debug = 1;
+ break;
+
+ case 'c':
+ case OPT(OPT_CLIENT):
+ conf->server = 0;
+ conf->client = 1;
+ break;
+ case 's':
+ case OPT(OPT_SERVER):
+ conf->client = 0;
+ conf->server = 1;
+ break;
+
+ case 'i':
+ case OPT(OPT_INTERFACE):
+ t = strdup(optarg);
+ if (!t)
+ return OOM();
+ free(conf->interface);
+ conf->interface = t;
+ break;
+ case OPT(OPT_IP_BINARY):
+ t = strdup(optarg);
+ if (!t)
+ return OOM();
+ free(conf->ip_binary);
+ conf->ip_binary = t;
+ break;
+
+ case OPT(OPT_LOCAL):
+ t = strdup(optarg);
+ if (!t)
+ return OOM();
+ free(conf->local);
+ conf->local = t;
+ break;
+ case OPT(OPT_GATEWAY):
+ t = strdup(optarg);
+ if (!t)
+ return OOM();
+ free(conf->gateway);
+ conf->gateway = t;
+ break;
+ case OPT(OPT_DNS):
+ t = strdup(optarg);
+ if (!t)
+ return OOM();
+ free(conf->dns);
+ conf->dns = t;
+ break;
+ case OPT(OPT_SUBNET):
+ t = strdup(optarg);
+ if (!t)
+ return OOM();
+ free(conf->subnet);
+ conf->subnet = t;
+ break;
+ case OPT(OPT_IP_FROM):
+ t = strdup(optarg);
+ if (!t)
+ return OOM();
+ free(conf->ip_from);
+ conf->ip_from = t;
+ break;
+ case OPT(OPT_IP_TO):
+ t = strdup(optarg);
+ if (!t)
+ return OOM();
+ free(conf->ip_to);
+ conf->ip_to = t;
+ break;
+ }
+#undef OPT
+ }
+
+ if (help) {
+ show_help();
+ return -EAGAIN;
+ }
+
+ if (optind < argc) {
+ fprintf(stderr,
+ "unparsed remaining arguments starting with: %s\n",
+ argv[optind]);
+ return -EINVAL;
+ }
+
+ if (!conf->client && !conf->server) {
+ fprintf(stderr,
+ "no --client or --server given\n");
+ return -EINVAL;
+ }
+
+ if (!conf->interface) {
+ fprintf(stderr, "no interface given, use: -i <iface>\n");
+ return -EINVAL;
+ }
+
+ if (!conf->ip_binary) {
+ conf->ip_binary = strdup(BUILD_BINDIR_IP "/ip");
+ if (!conf->ip_binary)
+ return OOM();
+ }
+
+ if (conf->server) {
+ r = verify_address("--local", conf->local);
+ if (r < 0)
+ return r;
+ r = verify_address("--gateway", conf->gateway);
+ if (r < 0)
+ return r;
+ r = verify_address("--dns", conf->dns);
+ if (r < 0)
+ return r;
+ r = verify_address("--subnet", conf->subnet);
+ if (r < 0)
+ return r;
+ r = verify_address("--ip-from", conf->ip_from);
+ if (r < 0)
+ return r;
+ r = verify_address("--ip-to", conf->ip_to);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-04 01:53:21 +0000