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Diffstat (limited to 'src/openvpn/networking_iproute2.c')
-rw-r--r--src/openvpn/networking_iproute2.c382
1 files changed, 382 insertions, 0 deletions
diff --git a/src/openvpn/networking_iproute2.c b/src/openvpn/networking_iproute2.c
new file mode 100644
index 0000000..f3b9c61
--- /dev/null
+++ b/src/openvpn/networking_iproute2.c
@@ -0,0 +1,382 @@
+/*
+ * Networking API implementation for iproute2
+ *
+ * Copyright (C) 2018 Antonio Quartulli <a@unstable.cc>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#if defined(TARGET_LINUX) && defined(ENABLE_IPROUTE)
+
+#include "syshead.h"
+
+#include "argv.h"
+#include "networking.h"
+#include "misc.h"
+#include "openvpn.h"
+#include "run_command.h"
+#include "socket.h"
+
+#include <stdbool.h>
+#include <netinet/in.h>
+
+int
+net_ctx_init(struct context *c, openvpn_net_ctx_t *ctx)
+{
+ ctx->es = NULL;
+ if (c)
+ {
+ ctx->es = c->es;
+ }
+ ctx->gc = gc_new();
+
+ return 0;
+}
+
+void
+net_ctx_reset(openvpn_net_ctx_t *ctx)
+{
+ gc_reset(&ctx->gc);
+}
+
+void
+net_ctx_free(openvpn_net_ctx_t *ctx)
+{
+ gc_free(&ctx->gc);
+}
+
+int
+net_iface_up(openvpn_net_ctx_t *ctx, const char *iface, bool up)
+{
+ struct argv argv = argv_new();
+
+ argv_printf(&argv, "%s link set dev %s %s", iproute_path, iface,
+ up ? "up" : "down");
+ argv_msg(M_INFO, &argv);
+ openvpn_execve_check(&argv, ctx->es, S_FATAL, "Linux ip link set failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_iface_mtu_set(openvpn_net_ctx_t *ctx, const char *iface, uint32_t mtu)
+{
+ struct argv argv = argv_new();
+
+ argv_printf(&argv, "%s link set dev %s up mtu %d", iproute_path, iface,
+ mtu);
+ argv_msg(M_INFO, &argv);
+ openvpn_execve_check(&argv, ctx->es, S_FATAL, "Linux ip link set failed");
+
+ return 0;
+}
+
+int
+net_addr_v4_add(openvpn_net_ctx_t *ctx, const char *iface,
+ const in_addr_t *addr, int prefixlen)
+{
+ struct argv argv = argv_new();
+
+ const char *addr_str = print_in_addr_t(*addr, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s addr add dev %s %s/%d", iproute_path, iface,
+ addr_str, prefixlen);
+ argv_msg(M_INFO, &argv);
+ openvpn_execve_check(&argv, ctx->es, S_FATAL, "Linux ip addr add failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_addr_v6_add(openvpn_net_ctx_t *ctx, const char *iface,
+ const struct in6_addr *addr, int prefixlen)
+{
+ struct argv argv = argv_new();
+ char *addr_str = (char *)print_in6_addr(*addr, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s -6 addr add %s/%d dev %s", iproute_path, addr_str,
+ prefixlen, iface);
+ argv_msg(M_INFO, &argv);
+ openvpn_execve_check(&argv, ctx->es, S_FATAL,
+ "Linux ip -6 addr add failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_addr_v4_del(openvpn_net_ctx_t *ctx, const char *iface,
+ const in_addr_t *addr, int prefixlen)
+{
+ struct argv argv = argv_new();
+ const char *addr_str = print_in_addr_t(*addr, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s addr del dev %s %s/%d", iproute_path, iface,
+ addr_str, prefixlen);
+
+ argv_msg(M_INFO, &argv);
+ openvpn_execve_check(&argv, ctx->es, 0, "Linux ip addr del failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_addr_v6_del(openvpn_net_ctx_t *ctx, const char *iface,
+ const struct in6_addr *addr, int prefixlen)
+{
+ struct argv argv = argv_new();
+ char *addr_str = (char *)print_in6_addr(*addr, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s -6 addr del %s/%d dev %s", iproute_path,
+ addr_str, prefixlen, iface);
+ argv_msg(M_INFO, &argv);
+ openvpn_execve_check(&argv, ctx->es, 0, "Linux ip -6 addr del failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_addr_ptp_v4_add(openvpn_net_ctx_t *ctx, const char *iface,
+ const in_addr_t *local, const in_addr_t *remote)
+{
+ struct argv argv = argv_new();
+ const char *local_str = print_in_addr_t(*local, 0, &ctx->gc);
+ const char *remote_str = print_in_addr_t(*remote, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s addr add dev %s local %s peer %s", iproute_path,
+ iface, local_str, remote_str);
+ argv_msg(M_INFO, &argv);
+ openvpn_execve_check(&argv, ctx->es, S_FATAL, "Linux ip addr add failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_addr_ptp_v4_del(openvpn_net_ctx_t *ctx, const char *iface,
+ const in_addr_t *local, const in_addr_t *remote)
+{
+ struct argv argv = argv_new();
+ const char *local_str = print_in_addr_t(*local, 0, &ctx->gc);
+ const char *remote_str = print_in_addr_t(*remote, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s addr del dev %s local %s peer %s", iproute_path,
+ iface, local_str, remote_str);
+ argv_msg(M_INFO, &argv);
+ openvpn_execve_check(&argv, ctx->es, 0, "Linux ip addr del failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_route_v4_add(openvpn_net_ctx_t *ctx, const in_addr_t *dst, int prefixlen,
+ const in_addr_t *gw, const char *iface, uint32_t table,
+ int metric)
+{
+ struct argv argv = argv_new();
+ const char *dst_str = print_in_addr_t(*dst, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s route add %s/%d", iproute_path, dst_str, prefixlen);
+
+ if (metric > 0)
+ {
+ argv_printf_cat(&argv, "metric %d", metric);
+ }
+
+ if (iface)
+ {
+ argv_printf_cat(&argv, "dev %s", iface);
+ }
+
+ if (gw)
+ {
+ const char *gw_str = print_in_addr_t(*gw, 0, &ctx->gc);
+
+ argv_printf_cat(&argv, "via %s", gw_str);
+ }
+
+ argv_msg(D_ROUTE, &argv);
+ openvpn_execve_check(&argv, ctx->es, 0, "ERROR: Linux route add command failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_route_v6_add(openvpn_net_ctx_t *ctx, const struct in6_addr *dst,
+ int prefixlen, const struct in6_addr *gw, const char *iface,
+ uint32_t table, int metric)
+{
+ struct argv argv = argv_new();
+ char *dst_str = (char *)print_in6_addr(*dst, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s -6 route add %s/%d dev %s", iproute_path, dst_str,
+ prefixlen, iface);
+
+ if (gw)
+ {
+ char *gw_str = (char *)print_in6_addr(*gw, 0, &ctx->gc);
+
+ argv_printf_cat(&argv, "via %s", gw_str);
+ }
+
+ if (metric > 0)
+ {
+ argv_printf_cat(&argv, "metric %d", metric);
+ }
+
+ argv_msg(D_ROUTE, &argv);
+ openvpn_execve_check(&argv, ctx->es, 0, "ERROR: Linux route -6 add command failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_route_v4_del(openvpn_net_ctx_t *ctx, const in_addr_t *dst, int prefixlen,
+ const in_addr_t *gw, const char *iface, uint32_t table,
+ int metric)
+{
+ struct argv argv = argv_new();
+ const char *dst_str = print_in_addr_t(*dst, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s route del %s/%d", iproute_path, dst_str, prefixlen);
+
+ if (metric > 0)
+ {
+ argv_printf_cat(&argv, "metric %d", metric);
+ }
+
+ argv_msg(D_ROUTE, &argv);
+ openvpn_execve_check(&argv, ctx->es, 0, "ERROR: Linux route delete command failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_route_v6_del(openvpn_net_ctx_t *ctx, const struct in6_addr *dst,
+ int prefixlen, const struct in6_addr *gw, const char *iface,
+ uint32_t table, int metric)
+{
+ struct argv argv = argv_new();
+ char *dst_str = (char *)print_in6_addr(*dst, 0, &ctx->gc);
+
+ argv_printf(&argv, "%s -6 route del %s/%d dev %s", iproute_path, dst_str,
+ prefixlen, iface);
+
+ if (gw)
+ {
+ char *gw_str = (char *)print_in6_addr(*gw, 0, &ctx->gc);
+
+ argv_printf_cat(&argv, "via %s", gw_str);
+ }
+
+ if (metric > 0)
+ {
+ argv_printf_cat(&argv, "metric %d", metric);
+ }
+
+ argv_msg(D_ROUTE, &argv);
+ openvpn_execve_check(&argv, ctx->es, 0, "ERROR: Linux route -6 del command failed");
+
+ argv_free(&argv);
+
+ return 0;
+}
+
+int
+net_route_v4_best_gw(openvpn_net_ctx_t *ctx, const in_addr_t *dst,
+ in_addr_t *best_gw, char *best_iface)
+{
+ best_iface[0] = '\0';
+
+ FILE *fp = fopen("/proc/net/route", "r");
+ if (!fp)
+ {
+ return -1;
+ }
+
+ char line[256];
+ int count = 0;
+ unsigned int lowest_metric = UINT_MAX;
+ while (fgets(line, sizeof(line), fp) != NULL)
+ {
+ if (count)
+ {
+ unsigned int net_x = 0;
+ unsigned int mask_x = 0;
+ unsigned int gw_x = 0;
+ unsigned int metric = 0;
+ unsigned int flags = 0;
+ char name[16];
+ name[0] = '\0';
+
+ const int np = sscanf(line, "%15s\t%x\t%x\t%x\t%*s\t%*s\t%d\t%x",
+ name, &net_x, &gw_x, &flags, &metric,
+ &mask_x);
+
+ if (np == 6 && (flags & IFF_UP))
+ {
+ const in_addr_t net = ntohl(net_x);
+ const in_addr_t mask = ntohl(mask_x);
+ const in_addr_t gw = ntohl(gw_x);
+
+ if (!net && !mask && metric < lowest_metric)
+ {
+ *best_gw = gw;
+ strcpy(best_iface, name);
+ lowest_metric = metric;
+ }
+ }
+ }
+ ++count;
+ }
+ fclose(fp);
+
+ return 0;
+}
+
+/*
+ * The following function is not implemented in the iproute backend as it
+ * uses the sitnl implementation from networking_sitnl.c.
+ *
+ * int
+ * net_route_v6_best_gw(const struct in6_addr *dst,
+ * struct in6_addr *best_gw, char *best_iface)
+ */
+
+#endif /* ENABLE_IPROUTE && TARGET_LINUX */
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