mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 14:37:57 +00:00
90 lines
2.9 KiB
Diff
90 lines
2.9 KiB
Diff
Index: busybox-1.7.2/networking/udhcp/packet.c
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===================================================================
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--- busybox-1.7.2.orig/networking/udhcp/packet.c 2007-10-30 15:35:00.000000000 -0500
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+++ busybox-1.7.2/networking/udhcp/packet.c 2007-10-30 15:35:01.000000000 -0500
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@@ -121,6 +121,10 @@
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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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void BUG_sizeof_struct_udp_dhcp_packet_must_be_576(void);
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@@ -132,6 +136,7 @@
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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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fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
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if (fd < 0) {
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@@ -141,6 +146,7 @@
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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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@@ -158,12 +164,13 @@
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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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@@ -172,7 +179,7 @@
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if (sizeof(struct udp_dhcp_packet) != 576)
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BUG_sizeof_struct_udp_dhcp_packet_must_be_576();
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- result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0,
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+ result = sendto(fd, &packet, p_len, 0,
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(struct sockaddr *) &dest, sizeof(dest));
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if (result <= 0) {
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bb_perror_msg("sendto");
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@@ -216,7 +223,7 @@
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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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Index: busybox-1.7.2/networking/udhcp/common.h
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===================================================================
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--- busybox-1.7.2.orig/networking/udhcp/common.h 2007-10-30 15:35:00.000000000 -0500
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+++ busybox-1.7.2/networking/udhcp/common.h 2007-10-30 15:35:01.000000000 -0500
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@@ -21,6 +21,8 @@
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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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@@ -37,7 +39,7 @@
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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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