sd-dhcp: rely on FIONREAD working

[elogind.git] / src / libsystemd-network / sd-dhcp-client.c

diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 2ddb9ad1dca6bcdec44981b4171b0d33f7d03c35..ba44069f662a4303b260b47c70ec339538fb07a0 100644 (file)
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -30,6 +30,7 @@
 #include "util.h"
 #include "list.h"
 #include "refcnt.h"
+#include "async.h"
 
 #include "dhcp-protocol.h"
 #include "dhcp-internal.h"
@@ -209,7 +210,7 @@ static int client_initialize(sd_dhcp_client *client) {
         client->receive_message =
                 sd_event_source_unref(client->receive_message);
 
-        client->fd = safe_close(client->fd);
+        client->fd = asynchronous_close(client->fd);
 
         client->timeout_resend = sd_event_source_unref(client->timeout_resend);
 
@@ -236,7 +237,7 @@ static sd_dhcp_client *client_stop(sd_dhcp_client *client, int error) {
         else {
                 switch(error) {
                 case DHCP_EVENT_STOP:
-                        log_dhcp_client(client, "STOPPED: Requested by user");
+                        log_dhcp_client(client, "STOPPED");
                         break;
                 case DHCP_EVENT_NO_LEASE:
                         log_dhcp_client(client, "STOPPED: No lease");
@@ -256,19 +257,18 @@ static sd_dhcp_client *client_stop(sd_dhcp_client *client, int error) {
 }
 
 static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
-                               uint8_t type, uint8_t **opt, size_t *optlen) {
+                               uint8_t type, size_t optlen, size_t *optoffset) {
         be16_t max_size;
         int r;
 
         assert(client);
         assert(client->secs);
         assert(message);
-        assert(opt);
-        assert(optlen);
+        assert(optoffset);
         assert(type == DHCP_DISCOVER || type == DHCP_REQUEST);
 
-        r = dhcp_message_init(message, BOOTREQUEST, client->xid, type, opt,
-                              optlen);
+        r = dhcp_message_init(message, BOOTREQUEST, client->xid, type,
+                              optlen, optoffset);
         if (r < 0)
                 return r;
 
@@ -284,7 +284,8 @@ static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
 
         /* Some DHCP servers will refuse to issue an DHCP lease if the Client
            Identifier option is not set */
-        r = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
+        r = dhcp_option_append(message, optlen, optoffset, 0,
+                               DHCP_OPTION_CLIENT_IDENTIFIER,
                                sizeof(client->client_id), &client->client_id);
         if (r < 0)
                 return r;
@@ -298,10 +299,9 @@ static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
            it MUST include that list in any subsequent DHCPREQUEST
            messages.
          */
-        r = dhcp_option_append(opt, optlen,
+        r = dhcp_option_append(message, optlen, optoffset, 0,
                                DHCP_OPTION_PARAMETER_REQUEST_LIST,
-                               client->req_opts_size,
-                               client->req_opts);
+                               client->req_opts_size, client->req_opts);
         if (r < 0)
                 return r;
 
@@ -315,7 +315,7 @@ static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
          */
         max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
                            DHCP_MIN_OPTIONS_SIZE);
-        r = dhcp_option_append(opt, optlen,
+        r = dhcp_option_append(message, optlen, optoffset, 0,
                                DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
                                2, &max_size);
         if (r < 0)
@@ -335,8 +335,7 @@ static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet,
 
 static int client_send_discover(sd_dhcp_client *client) {
         _cleanup_free_ DHCPPacket *discover = NULL;
-        size_t optlen, len;
-        uint8_t *opt;
+        size_t optoffset, optlen, len;
         usec_t time_now;
         int r;
 
@@ -363,7 +362,7 @@ static int client_send_discover(sd_dhcp_client *client) {
                 return -ENOMEM;
 
         r = client_message_init(client, &discover->dhcp, DHCP_DISCOVER,
-                                &opt, &optlen);
+                                optlen, &optoffset);
         if (r < 0)
                 return r;
 
@@ -374,22 +373,21 @@ static int client_send_discover(sd_dhcp_client *client) {
            option to suggest the lease time it would like.
          */
         if (client->last_addr != INADDR_ANY) {
-                r = dhcp_option_append(&opt, &optlen,
-                                         DHCP_OPTION_REQUESTED_IP_ADDRESS,
-                                         4, &client->last_addr);
+                r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+                                       DHCP_OPTION_REQUESTED_IP_ADDRESS,
+                                       4, &client->last_addr);
                 if (r < 0)
                         return r;
         }
 
-        r = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
-        if (r < 0)
-                return r;
+        r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
+                               DHCP_OPTION_END, 0, NULL);
 
         /* We currently ignore:
            The client SHOULD wait a random time between one and ten seconds to
            desynchronize the use of DHCP at startup.
          */
-        r = dhcp_client_send_raw(client, discover, len - optlen);
+        r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset);
         if (r < 0)
                 return r;
 
@@ -400,8 +398,7 @@ static int client_send_discover(sd_dhcp_client *client) {
 
 static int client_send_request(sd_dhcp_client *client) {
         _cleanup_free_ DHCPPacket *request;
-        size_t optlen, len;
-        uint8_t *opt;
+        size_t optoffset, optlen, len;
         int r;
 
         optlen = DHCP_MIN_OPTIONS_SIZE;
@@ -411,8 +408,8 @@ static int client_send_request(sd_dhcp_client *client) {
         if (!request)
                 return -ENOMEM;
 
-        r = client_message_init(client, &request->dhcp, DHCP_REQUEST, &opt,
-                                &optlen);
+        r = client_message_init(client, &request->dhcp, DHCP_REQUEST,
+                                optlen, &optoffset);
         if (r < 0)
                 return r;
 
@@ -427,13 +424,13 @@ static int client_send_request(sd_dhcp_client *client) {
                    filled in with the yiaddr value from the chosen DHCPOFFER.
                  */
 
-                r = dhcp_option_append(&opt, &optlen,
+                r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
                                        DHCP_OPTION_SERVER_IDENTIFIER,
                                        4, &client->lease->server_address);
                 if (r < 0)
                         return r;
 
-                r = dhcp_option_append(&opt, &optlen,
+                r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
                                        DHCP_OPTION_REQUESTED_IP_ADDRESS,
                                        4, &client->lease->address);
                 if (r < 0)
@@ -446,7 +443,7 @@ static int client_send_request(sd_dhcp_client *client) {
                    option MUST be filled in with client’s notion of its previously
                    assigned address. ’ciaddr’ MUST be zero.
                  */
-                r = dhcp_option_append(&opt, &optlen,
+                r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
                                        DHCP_OPTION_REQUESTED_IP_ADDRESS,
                                        4, &client->last_addr);
                 if (r < 0)
@@ -479,7 +476,8 @@ static int client_send_request(sd_dhcp_client *client) {
                 return -EINVAL;
         }
 
-        r = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
+        r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
+                               DHCP_OPTION_END, 0, NULL);
         if (r < 0)
                 return r;
 
@@ -488,9 +486,9 @@ static int client_send_request(sd_dhcp_client *client) {
                                                  client->lease->server_address,
                                                  DHCP_PORT_SERVER,
                                                  &request->dhcp,
-                                                 len - optlen - DHCP_IP_UDP_SIZE);
+                                                 sizeof(DHCPMessage) + optoffset);
         } else {
-                r = dhcp_client_send_raw(client, request, len - optlen);
+                r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset);
         }
         if (r < 0)
                 return r;
@@ -747,7 +745,7 @@ static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata)
         int r;
 
         client->receive_message = sd_event_source_unref(client->receive_message);
-        client->fd = safe_close(client->fd);
+        client->fd = asynchronous_close(client->fd);
 
         client->state = DHCP_STATE_REBINDING;
         client->attempt = 1;
@@ -770,8 +768,7 @@ static int client_timeout_t1(sd_event_source *s, uint64_t usec,
         client->state = DHCP_STATE_RENEWING;
         client->attempt = 1;
 
-        r = dhcp_network_bind_udp_socket(client->index,
-                                         client->lease->address,
+        r = dhcp_network_bind_udp_socket(client->lease->address,
                                          DHCP_PORT_CLIENT);
         if (r < 0) {
                 client_stop(client, r);
@@ -1154,7 +1151,7 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
 
                         client->receive_message =
                                 sd_event_source_unref(client->receive_message);
-                        client->fd = safe_close(client->fd);
+                        client->fd = asynchronous_close(client->fd);
                 } else if (r == -ENOMSG)
                         /* invalid message, let's ignore it */
                         return 0;
@@ -1189,8 +1186,12 @@ static int client_receive_message_udp(sd_event_source *s, int fd,
         assert(client);
 
         r = ioctl(fd, FIONREAD, &buflen);
-        if (r < 0 || buflen <= 0)
-                buflen = sizeof(DHCPMessage) + DHCP_MIN_OPTIONS_SIZE;
+        if (r < 0)
+                return r;
+
+        if (buflen < 0)
+                /* this can't be right */
+                return -EIO;
 
         message = malloc0(buflen);
         if (!message)
@@ -1227,8 +1228,12 @@ static int client_receive_message_raw(sd_event_source *s, int fd,
         assert(client);
 
         r = ioctl(fd, FIONREAD, &buflen);
-        if (r < 0 || buflen <= 0)
-                buflen = sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE;
+        if (r < 0)
+                return r;
+
+        if (buflen < 0)
+                /* this can't be right */
+                return -EIO;
 
         packet = malloc0(buflen);
         if (!packet)