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Diffstat (limited to 'networking/udhcp/packet.c')
-rw-r--r--networking/udhcp/packet.c76
1 files changed, 60 insertions, 16 deletions
diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index e2c8e6e..2cd5f61 100644
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -5,7 +5,6 @@
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
-
#include <netinet/in.h>
#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
#include <netpacket/packet.h>
@@ -20,7 +19,6 @@
#include "dhcpd.h"
#include "options.h"
-
void FAST_FUNC udhcp_init_header(struct dhcpMessage *packet, char type)
{
memset(packet, 0, sizeof(struct dhcpMessage));
@@ -38,8 +36,54 @@ void FAST_FUNC udhcp_init_header(struct dhcpMessage *packet, char type)
add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
}
+#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
+void FAST_FUNC udhcp_dump_packet(struct dhcpMessage *packet)
+{
+ char buf[sizeof(packet->chaddr)*2 + 1];
+
+ if (dhcp_verbose < 2)
+ return;
+
+ bb_info_msg(
+ //" op %x"
+ //" htype %x"
+ " hlen %x"
+ //" hops %x"
+ " xid %x"
+ //" secs %x"
+ //" flags %x"
+ " ciaddr %x"
+ " yiaddr %x"
+ " siaddr %x"
+ " giaddr %x"
+ //" chaddr %s"
+ //" sname %s"
+ //" file %s"
+ //" cookie %x"
+ //" options %s"
+ //, packet->op
+ //, packet->htype
+ , packet->hlen
+ //, packet->hops
+ , packet->xid
+ //, packet->secs
+ //, packet->flags
+ , packet->ciaddr
+ , packet->yiaddr
+ , packet->siaddr_nip
+ , packet->gateway_nip
+ //, packet->chaddr[16]
+ //, packet->sname[64]
+ //, packet->file[128]
+ //, packet->cookie
+ //, packet->options[]
+ );
+ bin2hex(buf, (void *) packet->chaddr, sizeof(packet->chaddr));
+ bb_info_msg(" chaddr %s", buf);
+}
+#endif
-/* read a packet from socket fd, return -1 on read error, -2 on packet error */
+/* Read a packet from socket fd, return -1 on read error, -2 on packet error */
int FAST_FUNC udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd)
{
int bytes;
@@ -48,15 +92,16 @@ int FAST_FUNC udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd)
memset(packet, 0, sizeof(*packet));
bytes = safe_read(fd, packet, sizeof(*packet));
if (bytes < 0) {
- DEBUG("cannot read on listening socket, ignoring");
+ log1("Packet read error, ignoring");
return bytes; /* returns -1 */
}
if (packet->cookie != htonl(DHCP_MAGIC)) {
- bb_error_msg("received bogus message, ignoring");
+ bb_info_msg("Packet with bad magic, ignoring");
return -2;
}
- DEBUG("Received a packet");
+ log1("Received a packet");
+ udhcp_dump_packet(packet);
if (packet->op == BOOTREQUEST) {
vendor = get_option(packet, DHCP_VENDOR);
@@ -71,7 +116,7 @@ int FAST_FUNC udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd)
if (vendor[OPT_LEN - 2] == (uint8_t)strlen(broken_vendors[i])
&& !strncmp((char*)vendor, broken_vendors[i], vendor[OPT_LEN - 2])
) {
- DEBUG("broken client (%s), forcing broadcast replies",
+ log1("Broken client (%s), forcing broadcast replies",
broken_vendors[i]);
packet->flags |= htons(BROADCAST_FLAG);
}
@@ -80,7 +125,7 @@ int FAST_FUNC udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd)
if (vendor[OPT_LEN - 2] == (uint8_t)(sizeof("MSFT 98")-1)
&& memcmp(vendor, "MSFT 98", sizeof("MSFT 98")-1) == 0
) {
- DEBUG("broken client (%s), forcing broadcast replies", "MSFT 98");
+ log1("Broken client (%s), forcing broadcast replies", "MSFT 98");
packet->flags |= htons(BROADCAST_FLAG);
}
#endif
@@ -90,11 +135,10 @@ int FAST_FUNC udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd)
return bytes;
}
-
uint16_t FAST_FUNC udhcp_checksum(void *addr, int count)
{
/* Compute Internet Checksum for "count" bytes
- * beginning at location "addr".
+ * beginning at location "addr".
*/
int32_t sum = 0;
uint16_t *source = (uint16_t *) addr;
@@ -120,9 +164,8 @@ uint16_t FAST_FUNC udhcp_checksum(void *addr, int count)
return ~sum;
}
-
/* Construct a ip/udp header for a packet, send packet */
-int FAST_FUNC udhcp_send_raw_packet(struct dhcpMessage *payload,
+int FAST_FUNC udhcp_send_raw_packet(struct dhcpMessage *dhcp_pkt,
uint32_t source_ip, int source_port,
uint32_t dest_ip, int dest_port, const uint8_t *dest_arp,
int ifindex)
@@ -146,7 +189,7 @@ int FAST_FUNC udhcp_send_raw_packet(struct dhcpMessage *payload,
memset(&dest, 0, sizeof(dest));
memset(&packet, 0, sizeof(packet));
- packet.data = *payload; /* struct copy */
+ packet.data = *dhcp_pkt; /* struct copy */
dest.sll_family = AF_PACKET;
dest.sll_protocol = htons(ETH_P_IP);
@@ -179,6 +222,7 @@ int FAST_FUNC udhcp_send_raw_packet(struct dhcpMessage *payload,
* If you need to change this: last byte of the packet is
* packet.data.options[end_option(packet.data.options)]
*/
+ udhcp_dump_packet(dhcp_pkt);
result = sendto(fd, &packet, IP_UPD_DHCP_SIZE, 0,
(struct sockaddr *) &dest, sizeof(dest));
msg = "sendto";
@@ -191,9 +235,8 @@ int FAST_FUNC udhcp_send_raw_packet(struct dhcpMessage *payload,
return result;
}
-
/* Let the kernel do all the work for packet generation */
-int FAST_FUNC udhcp_send_kernel_packet(struct dhcpMessage *payload,
+int FAST_FUNC udhcp_send_kernel_packet(struct dhcpMessage *dhcp_pkt,
uint32_t source_ip, int source_port,
uint32_t dest_ip, int dest_port)
{
@@ -232,7 +275,8 @@ int FAST_FUNC udhcp_send_kernel_packet(struct dhcpMessage *payload,
}
/* Currently we send full-sized DHCP packets (see above) */
- result = safe_write(fd, payload, DHCP_SIZE);
+ udhcp_dump_packet(dhcp_pkt);
+ result = safe_write(fd, dhcp_pkt, DHCP_SIZE);
msg = "write";
ret_close:
close(fd);
generated by cgit v1.1 at 2024-12-28 16:36:26 +0000