blob: 7332d6c652786dc1ec0bf9141b6cd1c63ae7e1f3 [file] [log] [blame]
/*
* Copyright 2011 Daniel Drown
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* dump.c - print various headers for debugging
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <linux/icmp.h>
#include <linux/if_tun.h>
#include <netinet/icmp6.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include "netutils/checksum.h"
#include "clatd.h"
#include "debug.h"
#include "dump.h"
#include "logging.h"
#if CLAT_DEBUG
/* print ip header */
void dump_ip(struct iphdr *header) {
u_int16_t frag_flags;
char addrstr[INET6_ADDRSTRLEN];
frag_flags = ntohs(header->frag_off);
printf("IP packet\n");
printf("header_len = %x\n", header->ihl);
printf("version = %x\n", header->version);
printf("tos = %x\n", header->tos);
printf("tot_len = %x\n", ntohs(header->tot_len));
printf("id = %x\n", ntohs(header->id));
printf("frag: ");
if (frag_flags & IP_RF) {
printf("(RF) ");
}
if (frag_flags & IP_DF) {
printf("DF ");
}
if (frag_flags & IP_MF) {
printf("MF ");
}
printf("offset = %x\n", frag_flags & IP_OFFMASK);
printf("ttl = %x\n", header->ttl);
printf("protocol = %x\n", header->protocol);
printf("checksum = %x\n", ntohs(header->check));
inet_ntop(AF_INET, &header->saddr, addrstr, sizeof(addrstr));
printf("saddr = %s\n", addrstr);
inet_ntop(AF_INET, &header->daddr, addrstr, sizeof(addrstr));
printf("daddr = %s\n", addrstr);
}
/* print ip6 header */
void dump_ip6(struct ip6_hdr *header) {
char addrstr[INET6_ADDRSTRLEN];
printf("ipv6\n");
printf("version = %x\n", header->ip6_vfc >> 4);
printf("traffic class = %x\n", header->ip6_flow >> 20);
printf("flow label = %x\n", ntohl(header->ip6_flow & 0x000fffff));
printf("payload len = %x\n", ntohs(header->ip6_plen));
printf("next header = %x\n", header->ip6_nxt);
printf("hop limit = %x\n", header->ip6_hlim);
inet_ntop(AF_INET6, &header->ip6_src, addrstr, sizeof(addrstr));
printf("source = %s\n", addrstr);
inet_ntop(AF_INET6, &header->ip6_dst, addrstr, sizeof(addrstr));
printf("dest = %s\n", addrstr);
}
/* print icmp header */
void dump_icmp(struct icmphdr *icmp) {
printf("ICMP\n");
printf("icmp.type = %x ", icmp->type);
if (icmp->type == ICMP_ECHOREPLY) {
printf("echo reply");
} else if (icmp->type == ICMP_ECHO) {
printf("echo request");
} else {
printf("other");
}
printf("\n");
printf("icmp.code = %x\n", icmp->code);
printf("icmp.checksum = %x\n", ntohs(icmp->checksum));
if (icmp->type == ICMP_ECHOREPLY || icmp->type == ICMP_ECHO) {
printf("icmp.un.echo.id = %x\n", ntohs(icmp->un.echo.id));
printf("icmp.un.echo.sequence = %x\n", ntohs(icmp->un.echo.sequence));
}
}
/* print icmp6 header */
void dump_icmp6(struct icmp6_hdr *icmp6) {
printf("ICMP6\n");
printf("type = %x", icmp6->icmp6_type);
if (icmp6->icmp6_type == ICMP6_ECHO_REQUEST) {
printf("(echo request)");
} else if (icmp6->icmp6_type == ICMP6_ECHO_REPLY) {
printf("(echo reply)");
}
printf("\n");
printf("code = %x\n", icmp6->icmp6_code);
printf("checksum = %x\n", icmp6->icmp6_cksum);
if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST) || (icmp6->icmp6_type == ICMP6_ECHO_REPLY)) {
printf("icmp6_id = %x\n", icmp6->icmp6_id);
printf("icmp6_seq = %x\n", icmp6->icmp6_seq);
}
}
/* print udp header */
void dump_udp_generic(const struct udphdr *udp, uint32_t temp_checksum, const uint8_t *payload,
size_t payload_size) {
uint16_t my_checksum;
temp_checksum = ip_checksum_add(temp_checksum, udp, sizeof(struct udphdr));
temp_checksum = ip_checksum_add(temp_checksum, payload, payload_size);
my_checksum = ip_checksum_finish(temp_checksum);
printf("UDP\n");
printf("source = %x\n", ntohs(udp->source));
printf("dest = %x\n", ntohs(udp->dest));
printf("len = %x\n", ntohs(udp->len));
printf("check = %x (mine %x)\n", udp->check, my_checksum);
}
/* print ipv4/udp header */
void dump_udp(const struct udphdr *udp, const struct iphdr *ip, const uint8_t *payload,
size_t payload_size) {
uint32_t temp_checksum;
temp_checksum = ipv4_pseudo_header_checksum(ip, sizeof(*udp) + payload_size);
dump_udp_generic(udp, temp_checksum, payload, payload_size);
}
/* print ipv6/udp header */
void dump_udp6(const struct udphdr *udp, const struct ip6_hdr *ip6, const uint8_t *payload,
size_t payload_size) {
uint32_t temp_checksum;
temp_checksum = ipv6_pseudo_header_checksum(ip6, sizeof(*udp) + payload_size, IPPROTO_UDP);
dump_udp_generic(udp, temp_checksum, payload, payload_size);
}
/* print tcp header */
void dump_tcp_generic(const struct tcphdr *tcp, const uint8_t *options, size_t options_size,
uint32_t temp_checksum, const uint8_t *payload, size_t payload_size) {
uint16_t my_checksum;
temp_checksum = ip_checksum_add(temp_checksum, tcp, sizeof(struct tcphdr));
if (options) {
temp_checksum = ip_checksum_add(temp_checksum, options, options_size);
}
temp_checksum = ip_checksum_add(temp_checksum, payload, payload_size);
my_checksum = ip_checksum_finish(temp_checksum);
printf("TCP\n");
printf("source = %x\n", ntohs(tcp->source));
printf("dest = %x\n", ntohs(tcp->dest));
printf("seq = %x\n", ntohl(tcp->seq));
printf("ack = %x\n", ntohl(tcp->ack_seq));
printf("d_off = %x\n", tcp->doff);
printf("res1 = %x\n", tcp->res1);
#ifdef __BIONIC__
printf("CWR = %x\n", tcp->cwr);
printf("ECE = %x\n", tcp->ece);
#else
printf("CWR/ECE = %x\n", tcp->res2);
#endif
printf("urg = %x ack = %x psh = %x rst = %x syn = %x fin = %x\n", tcp->urg, tcp->ack,
tcp->psh, tcp->rst, tcp->syn, tcp->fin);
printf("window = %x\n", ntohs(tcp->window));
printf("check = %x [mine %x]\n", tcp->check, my_checksum);
printf("urgent = %x\n", tcp->urg_ptr);
if (options) {
size_t i;
printf("options: ");
for (i = 0; i < options_size; i++) {
printf("%x ", *(options + i));
}
printf("\n");
}
}
/* print ipv4/tcp header */
void dump_tcp(const struct tcphdr *tcp, const struct iphdr *ip, const uint8_t *payload,
size_t payload_size, const uint8_t *options, size_t options_size) {
uint32_t temp_checksum;
temp_checksum = ipv4_pseudo_header_checksum(ip, sizeof(*tcp) + options_size + payload_size);
dump_tcp_generic(tcp, options, options_size, temp_checksum, payload, payload_size);
}
/* print ipv6/tcp header */
void dump_tcp6(const struct tcphdr *tcp, const struct ip6_hdr *ip6, const uint8_t *payload,
size_t payload_size, const uint8_t *options, size_t options_size) {
uint32_t temp_checksum;
temp_checksum =
ipv6_pseudo_header_checksum(ip6, sizeof(*tcp) + options_size + payload_size, IPPROTO_TCP);
dump_tcp_generic(tcp, options, options_size, temp_checksum, payload, payload_size);
}
/* generic hex dump */
void logcat_hexdump(const char *info, const uint8_t *data, size_t len) {
char output[PACKETLEN * 3 + 2];
size_t i;
output[0] = '\0';
for (i = 0; i < len && i < PACKETLEN; i++) {
snprintf(output + i * 3, 4, " %02x", data[i]);
}
output[len * 3 + 3] = '\0';
logmsg(ANDROID_LOG_WARN, "info %s len %d data%s", info, len, output);
}
void dump_iovec(const struct iovec *iov, int iov_len) {
int i;
char *str;
for (i = 0; i < iov_len; i++) {
asprintf(&str, "iov[%d]: ", i);
logcat_hexdump(str, iov[i].iov_base, iov[i].iov_len);
free(str);
}
}
#endif // CLAT_DEBUG