mirror of https://github.com/hak5/openwrt.git
86 lines
3.0 KiB
Diff
86 lines
3.0 KiB
Diff
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diff -ruN busybox-1.2.1-old/networking/udhcp/packet.c busybox-1.2.1-new/networking/udhcp/packet.c
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--- busybox-1.2.1-old/networking/udhcp/packet.c 2006-07-01 00:42:02.000000000 +0200
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+++ busybox-1.2.1-new/networking/udhcp/packet.c 2006-11-19 01:04:40.000000000 +0100
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@@ -111,6 +111,10 @@
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return ~sum;
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}
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+int udhcp_get_payload_len(struct dhcpMessage *payload)
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+{
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+ return sizeof(struct dhcpMessage) - MAX_OPTIONS_LEN + end_option(payload->options) + sizeof(payload->options[0]);
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+}
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/* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
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int udhcp_raw_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
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@@ -120,6 +124,7 @@
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int result;
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struct sockaddr_ll dest;
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struct udp_dhcp_packet packet;
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+ int p_len = udhcp_get_payload_len(payload);
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if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
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DEBUG(LOG_ERR, "socket call failed: %m");
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@@ -128,6 +133,7 @@
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memset(&dest, 0, sizeof(dest));
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memset(&packet, 0, sizeof(packet));
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+ memcpy(&(packet.data), payload, p_len);
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dest.sll_family = AF_PACKET;
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dest.sll_protocol = htons(ETH_P_IP);
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@@ -145,18 +151,19 @@
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packet.ip.daddr = dest_ip;
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packet.udp.source = htons(source_port);
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packet.udp.dest = htons(dest_port);
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- packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage)); /* cheat on the psuedo-header */
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+ p_len += sizeof(packet.udp);
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+ packet.udp.len = htons(p_len);
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packet.ip.tot_len = packet.udp.len;
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- memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
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- packet.udp.check = udhcp_checksum(&packet, sizeof(struct udp_dhcp_packet));
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+ p_len += sizeof(packet.ip);
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+ packet.udp.check = udhcp_checksum(&packet, p_len);
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- packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
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+ packet.ip.tot_len = htons(p_len);
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packet.ip.ihl = sizeof(packet.ip) >> 2;
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packet.ip.version = IPVERSION;
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packet.ip.ttl = IPDEFTTL;
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packet.ip.check = udhcp_checksum(&(packet.ip), sizeof(packet.ip));
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- result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0, (struct sockaddr *) &dest, sizeof(dest));
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+ result = sendto(fd, &packet, p_len, 0, (struct sockaddr *) &dest, sizeof(dest));
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if (result <= 0) {
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DEBUG(LOG_ERR, "write on socket failed: %m");
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}
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@@ -201,7 +208,7 @@
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return -1;
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}
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- result = write(fd, payload, sizeof(struct dhcpMessage));
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+ result = write(fd, payload, udhcp_get_payload_len(payload));
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close(fd);
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return result;
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}
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diff -ruN busybox-1.2.1-old/networking/udhcp/packet.h busybox-1.2.1-new/networking/udhcp/packet.h
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--- busybox-1.2.1-old/networking/udhcp/packet.h 2006-07-01 00:42:02.000000000 +0200
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+++ busybox-1.2.1-new/networking/udhcp/packet.h 2006-11-19 00:49:38.000000000 +0100
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@@ -4,6 +4,8 @@
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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+#define MAX_OPTIONS_LEN 308
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+
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struct dhcpMessage {
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uint8_t op;
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uint8_t htype;
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@@ -20,7 +22,7 @@
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uint8_t sname[64];
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uint8_t file[128];
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uint32_t cookie;
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- uint8_t options[308]; /* 312 - cookie */
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+ uint8_t options[MAX_OPTIONS_LEN]; /* 312 - cookie */
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};
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struct udp_dhcp_packet {
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