Imported Upstream version 1.29

[platform/upstream/connman.git] / gdhcp / common.c

diff --git a/gdhcp/common.c b/gdhcp/common.c
index 45278a8..f3d4677 100644 (file)
--- a/gdhcp/common.c
+++ b/gdhcp/common.c
@@ -35,6 +35,7 @@
 #include <netpacket/packet.h>
 #include <net/ethernet.h>
 #include <arpa/inet.h>
+#include <fcntl.h>
 
 #include "gdhcp.h"
 #include "common.h"
@@ -58,6 +59,42 @@ static const DHCPOption client_options[] = {
        { OPTION_UNKNOWN,               0x00 },
 };
 
+#define URANDOM "/dev/urandom"
+static int random_fd = -1;
+
+int dhcp_get_random(uint64_t *val)
+{
+       int r;
+
+       if (random_fd < 0) {
+               random_fd = open(URANDOM, O_RDONLY);
+               if (random_fd < 0) {
+                       r = -errno;
+                       *val = random();
+
+                       return r;
+               }
+       }
+
+       if (read(random_fd, val, sizeof(uint64_t)) < 0) {
+               r = -errno;
+               *val = random();
+
+               return r;
+       }
+
+       return 0;
+}
+
+void dhcp_cleanup_random(void)
+{
+       if (random_fd < 0)
+               return;
+
+       close(random_fd);
+       random_fd = -1;
+}
+
 GDHCPOptionType dhcp_get_code_type(uint8_t code)
 {
        int i;
@@ -356,12 +393,14 @@ void dhcp_init_header(struct dhcp_packet *packet, char type)
 void dhcpv6_init_header(struct dhcpv6_packet *packet, uint8_t type)
 {
        int id;
+       uint64_t rand;
 
        memset(packet, 0, sizeof(*packet));
 
        packet->message = type;
 
-       id = random();
+       dhcp_get_random(&rand);
+       id = rand;
 
        packet->transaction_id[0] = (id >> 16) & 0xff;
        packet->transaction_id[1] = (id >> 8) & 0xff;
@@ -434,19 +473,14 @@ uint16_t dhcp_checksum(void *addr, int count)
 static const struct in6_addr in6addr_all_dhcp_relay_agents_and_servers_mc =
        IN6ADDR_ALL_DHCP_RELAY_AGENTS_AND_SERVERS_MC_INIT;
 
-/* from netinet/in.h */
-struct in6_pktinfo {
-       struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
-       unsigned int ipi6_ifindex;  /* send/recv interface index */
-};
-
 int dhcpv6_send_packet(int index, struct dhcpv6_packet *dhcp_pkt, int len)
 {
        struct msghdr m;
        struct iovec v;
        struct in6_pktinfo *pktinfo;
        struct cmsghdr *cmsg;
-       int fd, ret;
+       int fd, ret, opt = 1;
+       struct sockaddr_in6 src;
        struct sockaddr_in6 dst;
        void *control_buf;
        size_t control_buf_len;
@@ -455,6 +489,17 @@ int dhcpv6_send_packet(int index, struct dhcpv6_packet *dhcp_pkt, int len)
        if (fd < 0)
                return -errno;
 
+       setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+
+       memset(&src, 0, sizeof(src));
+       src.sin6_family = AF_INET6;
+       src.sin6_port = htons(DHCPV6_CLIENT_PORT);
+
+       if (bind(fd, (struct sockaddr *) &src, sizeof(src)) <0) {
+               close(fd);
+               return -errno;
+       }
+
        memset(&dst, 0, sizeof(dst));
        dst.sin6_family = AF_INET6;
        dst.sin6_port = htons(DHCPV6_SERVER_PORT);