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Now capable of sending what, to me, looks like a valid DHCPDISCOVER

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(apart from the bad UDP checksum).
This commit is contained in:
Michael Brown 2006-07-19 20:50:50 +00:00
parent a38010fb0e
commit 224529d8dd
2 changed files with 37 additions and 3 deletions
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12
src/include/gpxe/dhcp.h
View File

@ -13,6 +13,12 @@
#include <gpxe/udp.h>
#include <gpxe/async.h>
/** BOOTP/DHCP server port */
#define BOOTPS_PORT 67
/** BOOTP/DHCP client port */
#define BOOTPC_PORT 68
/** Construct a tag value for an encapsulated option
*
* This tag value can be passed to Etherboot functions when searching
@ -345,9 +351,11 @@ struct dhcphdr {
uint32_t magic;
/** DHCP options
*
* Variable length; extends to the end of the packet.
* Variable length; extends to the end of the packet. Minimum
* length (for the sake of sanity) is 1, to allow for a single
* @c DHCP_END tag.
*/
uint8_t options[0];
uint8_t options[1];
};
/** Opcode for a request from client to server */

28
src/net/udp/dhcp.c
View File

@ -233,6 +233,10 @@ static int create_dhcp_packet ( struct dhcp_session *dhcp, uint8_t msgtype,
DHCP_OPTION_OVERLOAD_SNAME );
int rc;
/* Sanity check */
if ( max_len < sizeof ( *dhcphdr ) )
return -ENOSPC;
/* Initialise DHCP packet content */
memset ( dhcphdr, 0, max_len );
dhcphdr->xid = dhcp->xid;
@ -428,6 +432,15 @@ udp_to_dhcp ( struct udp_connection *conn ) {
return container_of ( conn, struct dhcp_session, udp );
}
/** Address for transmitting DHCP requests */
static struct sockaddr sa_dhcp_server = {
.sa_family = AF_INET,
.sin = {
.sin_addr.s_addr = INADDR_BROADCAST,
.sin_port = htons ( BOOTPS_PORT ),
},
};
/**
* Transmit DHCP request
*
@ -461,7 +474,11 @@ static void dhcp_senddata ( struct udp_connection *conn,
}
/* Transmit the packet */
udp_send ( conn, dhcppkt.dhcphdr, dhcppkt.len );
if ( ( rc = udp_sendto ( conn, &sa_dhcp_server,
dhcppkt.dhcphdr, dhcppkt.len ) ) != 0 ) {
DBG ( "Could not transmit UDP packet\n" );
return;
}
}
/**
@ -513,6 +530,8 @@ static struct udp_operations dhcp_udp_operations = {
* @ret aop Asynchronous operation
*/
struct async_operation * start_dhcp ( struct dhcp_session *dhcp ) {
int rc;
dhcp->udp.udp_op = &dhcp_udp_operations;
dhcp->state = DHCPDISCOVER;
/* Use least significant 32 bits of link-layer address as XID */
@ -520,8 +539,15 @@ struct async_operation * start_dhcp ( struct dhcp_session *dhcp ) {
+ dhcp->netdev->ll_protocol->ll_addr_len
- sizeof ( dhcp->xid ) ), sizeof ( dhcp->xid ));
/* Bind to local port */
if ( ( rc = udp_open ( &dhcp->udp, BOOTPC_PORT ) ) != 0 ) {
async_done ( &dhcp->aop, rc );
goto out;
}
/* Proof of concept: just send a single DHCPDISCOVER */
udp_senddata ( &dhcp->udp );
out:
return &dhcp->aop;
}