1 /*
2 * Copyright 2011 Daniel Drown
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 * dump.c - print various headers for debugging
17 */
18 #include <stdio.h>
19 #include <stdint.h>
20 #include <stdlib.h>
21
22 #include <arpa/inet.h>
23 #include <netinet/in.h>
24 #include <netinet/ip.h>
25 #include <netinet/ip_icmp.h>
26 #include <netinet/udp.h>
27 #include <netinet/tcp.h>
28 #include <netinet/ip6.h>
29 #include <netinet/icmp6.h>
30 #include <linux/icmp.h>
31
32 #include "debug.h"
33 #include "checksum.h"
34 #include "clatd.h"
35 #include "logging.h"
36
37 #if CLAT_DEBUG
38
39 /* print ip header */
dump_ip(struct iphdr * header)40 void dump_ip(struct iphdr *header) {
41 u_int16_t frag_flags;
42 char addrstr[INET6_ADDRSTRLEN];
43
44 frag_flags = ntohs(header->frag_off);
45
46 printf("IP packet\n");
47 printf("header_len = %x\n",header->ihl);
48 printf("version = %x\n",header->version);
49 printf("tos = %x\n",header->tos);
50 printf("tot_len = %x\n",ntohs(header->tot_len));
51 printf("id = %x\n",ntohs(header->id));
52 printf("frag: ");
53 if(frag_flags & IP_RF) {
54 printf("(RF) ");
55 }
56 if(frag_flags & IP_DF) {
57 printf("DF ");
58 }
59 if(frag_flags & IP_MF) {
60 printf("MF ");
61 }
62 printf("offset = %x\n",frag_flags & IP_OFFMASK);
63 printf("ttl = %x\n",header->ttl);
64 printf("protocol = %x\n",header->protocol);
65 printf("checksum = %x\n",ntohs(header->check));
66 inet_ntop(AF_INET, &header->saddr, addrstr, sizeof(addrstr));
67 printf("saddr = %s\n",addrstr);
68 inet_ntop(AF_INET, &header->daddr, addrstr, sizeof(addrstr));
69 printf("daddr = %s\n",addrstr);
70 }
71
72 /* print ip6 header */
dump_ip6(struct ip6_hdr * header)73 void dump_ip6(struct ip6_hdr *header) {
74 char addrstr[INET6_ADDRSTRLEN];
75
76 printf("ipv6\n");
77 printf("version = %x\n",header->ip6_vfc >> 4);
78 printf("traffic class = %x\n",header->ip6_flow >> 20);
79 printf("flow label = %x\n",ntohl(header->ip6_flow & 0x000fffff));
80 printf("payload len = %x\n",ntohs(header->ip6_plen));
81 printf("next header = %x\n",header->ip6_nxt);
82 printf("hop limit = %x\n",header->ip6_hlim);
83
84 inet_ntop(AF_INET6, &header->ip6_src, addrstr, sizeof(addrstr));
85 printf("source = %s\n",addrstr);
86
87 inet_ntop(AF_INET6, &header->ip6_dst, addrstr, sizeof(addrstr));
88 printf("dest = %s\n",addrstr);
89 }
90
91 /* print icmp header */
dump_icmp(struct icmphdr * icmp)92 void dump_icmp(struct icmphdr *icmp) {
93 printf("ICMP\n");
94
95 printf("icmp.type = %x ",icmp->type);
96 if(icmp->type == ICMP_ECHOREPLY) {
97 printf("echo reply");
98 } else if(icmp->type == ICMP_ECHO) {
99 printf("echo request");
100 } else {
101 printf("other");
102 }
103 printf("\n");
104 printf("icmp.code = %x\n",icmp->code);
105 printf("icmp.checksum = %x\n",ntohs(icmp->checksum));
106 if(icmp->type == ICMP_ECHOREPLY || icmp->type == ICMP_ECHO) {
107 printf("icmp.un.echo.id = %x\n",ntohs(icmp->un.echo.id));
108 printf("icmp.un.echo.sequence = %x\n",ntohs(icmp->un.echo.sequence));
109 }
110 }
111
112 /* print icmp6 header */
dump_icmp6(struct icmp6_hdr * icmp6)113 void dump_icmp6(struct icmp6_hdr *icmp6) {
114 printf("ICMP6\n");
115 printf("type = %x",icmp6->icmp6_type);
116 if(icmp6->icmp6_type == ICMP6_ECHO_REQUEST) {
117 printf("(echo request)");
118 } else if(icmp6->icmp6_type == ICMP6_ECHO_REPLY) {
119 printf("(echo reply)");
120 }
121 printf("\n");
122 printf("code = %x\n",icmp6->icmp6_code);
123
124 printf("checksum = %x\n",icmp6->icmp6_cksum);
125
126 if((icmp6->icmp6_type == ICMP6_ECHO_REQUEST) || (icmp6->icmp6_type == ICMP6_ECHO_REPLY)) {
127 printf("icmp6_id = %x\n",icmp6->icmp6_id);
128 printf("icmp6_seq = %x\n",icmp6->icmp6_seq);
129 }
130 }
131
132 /* print udp header */
dump_udp_generic(const struct udphdr * udp,uint32_t temp_checksum,const uint8_t * payload,size_t payload_size)133 void dump_udp_generic(const struct udphdr *udp, uint32_t temp_checksum,
134 const uint8_t *payload, size_t payload_size) {
135 uint16_t my_checksum;
136
137 temp_checksum = ip_checksum_add(temp_checksum, udp, sizeof(struct udphdr));
138 temp_checksum = ip_checksum_add(temp_checksum, payload, payload_size);
139 my_checksum = ip_checksum_finish(temp_checksum);
140
141 printf("UDP\n");
142 printf("source = %x\n",ntohs(udp->source));
143 printf("dest = %x\n",ntohs(udp->dest));
144 printf("len = %x\n",ntohs(udp->len));
145 printf("check = %x (mine %x)\n",udp->check,my_checksum);
146 }
147
148 /* print ipv4/udp header */
dump_udp(const struct udphdr * udp,const struct iphdr * ip,const uint8_t * payload,size_t payload_size)149 void dump_udp(const struct udphdr *udp, const struct iphdr *ip,
150 const uint8_t *payload, size_t payload_size) {
151 uint32_t temp_checksum;
152 temp_checksum = ipv4_pseudo_header_checksum(ip, sizeof(*udp) + payload_size);
153 dump_udp_generic(udp, temp_checksum, payload, payload_size);
154 }
155
156 /* print ipv6/udp header */
dump_udp6(const struct udphdr * udp,const struct ip6_hdr * ip6,const uint8_t * payload,size_t payload_size)157 void dump_udp6(const struct udphdr *udp, const struct ip6_hdr *ip6,
158 const uint8_t *payload, size_t payload_size) {
159 uint32_t temp_checksum;
160 temp_checksum = ipv6_pseudo_header_checksum(ip6, sizeof(*udp) + payload_size, IPPROTO_UDP);
161 dump_udp_generic(udp, temp_checksum, payload, payload_size);
162 }
163
164 /* print tcp header */
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)165 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) {
166 uint16_t my_checksum;
167
168 temp_checksum = ip_checksum_add(temp_checksum, tcp, sizeof(struct tcphdr));
169 if(options) {
170 temp_checksum = ip_checksum_add(temp_checksum, options, options_size);
171 }
172 temp_checksum = ip_checksum_add(temp_checksum, payload, payload_size);
173 my_checksum = ip_checksum_finish(temp_checksum);
174
175 printf("TCP\n");
176 printf("source = %x\n",ntohs(tcp->source));
177 printf("dest = %x\n",ntohs(tcp->dest));
178 printf("seq = %x\n",ntohl(tcp->seq));
179 printf("ack = %x\n",ntohl(tcp->ack_seq));
180 printf("d_off = %x\n",tcp->doff);
181 printf("res1 = %x\n",tcp->res1);
182 #ifdef __BIONIC__
183 printf("CWR = %x\n",tcp->cwr);
184 printf("ECE = %x\n",tcp->ece);
185 #else
186 printf("CWR/ECE = %x\n",tcp->res2);
187 #endif
188 printf("urg = %x ack = %x psh = %x rst = %x syn = %x fin = %x\n",
189 tcp->urg, tcp->ack, tcp->psh, tcp->rst, tcp->syn, tcp->fin);
190 printf("window = %x\n",ntohs(tcp->window));
191 printf("check = %x [mine %x]\n",tcp->check,my_checksum);
192 printf("urgent = %x\n",tcp->urg_ptr);
193
194 if(options) {
195 size_t i;
196
197 printf("options: ");
198 for(i=0; i<options_size; i++) {
199 printf("%x ",*(options+i));
200 }
201 printf("\n");
202 }
203 }
204
205 /* print ipv4/tcp header */
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)206 void dump_tcp(const struct tcphdr *tcp, const struct iphdr *ip,
207 const uint8_t *payload, size_t payload_size,
208 const uint8_t *options, size_t options_size) {
209 uint32_t temp_checksum;
210
211 temp_checksum = ipv4_pseudo_header_checksum(ip, sizeof(*tcp) + options_size + payload_size);
212 dump_tcp_generic(tcp, options, options_size, temp_checksum, payload, payload_size);
213 }
214
215 /* print ipv6/tcp header */
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)216 void dump_tcp6(const struct tcphdr *tcp, const struct ip6_hdr *ip6,
217 const uint8_t *payload, size_t payload_size,
218 const uint8_t *options, size_t options_size) {
219 uint32_t temp_checksum;
220
221 temp_checksum = ipv6_pseudo_header_checksum(ip6, sizeof(*tcp) + options_size + payload_size, IPPROTO_TCP);
222 dump_tcp_generic(tcp, options, options_size, temp_checksum, payload, payload_size);
223 }
224
225 /* generic hex dump */
logcat_hexdump(const char * info,const uint8_t * data,size_t len)226 void logcat_hexdump(const char *info, const uint8_t *data, size_t len) {
227 char output[PACKETLEN*3+2];
228 size_t i;
229
230 output[0] = '\0';
231 for(i = 0; i < len && i < PACKETLEN; i++) {
232 snprintf(output + i*3, 4, " %02x", data[i]);
233 }
234 output[len*3+3] = '\0';
235
236 logmsg(ANDROID_LOG_WARN,"info %s len %d data%s", info, len, output);
237 }
238
dump_iovec(const struct iovec * iov,int iov_len)239 void dump_iovec(const struct iovec *iov, int iov_len) {
240 int i;
241 char *str;
242 for (i = 0; i < iov_len; i++) {
243 asprintf(&str, "iov[%d]: ", i);
244 logcat_hexdump(str, iov[i].iov_base, iov[i].iov_len);
245 free(str);
246 }
247 }
248 #endif // CLAT_DEBUG
249