udhcpc: add -o "do not request options by default" switch

(by L. Gabriel Somlo <somlo AT cmu.edu>)

function                                             old     new   delta
udhcpc_main                                         2513    2554     +41
static.udhcpc_longopts                               226     247     +21
add_param_req_option                                 119     132     +13
packed_usage                                       23952   23964     +12
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 87/0)               Total: 87 bytes
This commit is contained in:
Denis Vlasenko
2008-04-02 13:04:19 +00:00
parent 0edbdd8ac8
commit 2e4c3c4cc3
6 changed files with 30 additions and 15 deletions

View File

@@ -62,17 +62,20 @@ static void add_param_req_option(struct dhcpMessage *packet)
int end = end_option(packet->options);
int i, len = 0;
packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
for (i = 0; (c = dhcp_options[i].code) != 0; i++) {
if ((dhcp_options[i].flags & OPTION_REQ)
if (((dhcp_options[i].flags & OPTION_REQ)
&& !client_config.no_default_options)
|| (client_config.opt_mask[c >> 3] & (1 << (c & 7)))
) {
packet->options[end + OPT_DATA + len] = c;
len++;
}
}
packet->options[end + OPT_LEN] = len;
packet->options[end + OPT_DATA + len] = DHCP_END;
if (len) {
packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
packet->options[end + OPT_LEN] = len;
packet->options[end + OPT_DATA + len] = DHCP_END;
}
}
@@ -107,7 +110,9 @@ int send_discover(uint32_t xid, uint32_t requested)
/* Explicitly saying that we want RFC-compliant packets helps
* some buggy DHCP servers to NOT send bigger packets */
add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576));
add_param_req_option(&packet);
bb_info_msg("Sending discover...");
return udhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
@@ -125,8 +130,8 @@ int send_selecting(uint32_t xid, uint32_t server, uint32_t requested)
add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
add_simple_option(packet.options, DHCP_SERVER_ID, server);
add_param_req_option(&packet);
addr.s_addr = requested;
bb_info_msg("Sending select for %s...", inet_ntoa(addr));
return udhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,