File: connect6.c

package info (click to toggle)
thc-ipv6 3.6-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 2,116 kB
  • sloc: ansic: 52,618; sh: 529; makefile: 77; perl: 34
file content (253 lines) | stat: -rw-r--r-- 7,217 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include "thc-ipv6.h"

#define PROGRAM "connect6"

#ifndef in6_pktinfo
struct in6_pktinfo {
  struct in6_addr ipi6_addr;
  int ipi6_ifindex;
};
#endif
char *prg;

void help() {
  printf("%s %s (c) 2019 by %s %s\n\n", PROGRAM, VERSION, AUTHOR, RESOURCE);
  printf("Syntax: %s [-a | -A type] [-i] target-ip target-port\n\n", prg);
  printf("Options:\n");
  printf("  -a       send Hop-by-Hop Router Alert option\n");
  printf("  -A type  like -a but lets you define the alarmtype (number)\n");
  printf("  -i       interactive mode (like telnet)\n");
  printf("  -I       end a linefeed, wait for a string, print it\n");
  printf("  -O       try TCP Fast Open connection\n");
  printf("  -w ms    wait time for connect in ms (default: 1000)\n");
  printf("  -p       ping mode\n");
  printf("You can supply a %%interface identifier to the target-ip\n");
  printf("Returns 0 on successful connect, 1 on timeout/reset\n");
  exit(-1);
}

void myalarm(int signal) {
  return;
}

int main(int argc, char *argv[]) {
  int i, t = -1, conn_len, do_alert = 0, interactive = 0, optval, optlen, fastopen = 0;
  unsigned long int ping = 0, waitms = 1000;
  char buf[1033], *interface, *target;
  struct addrinfo *res, *aip, *aip_saved = NULL;
  struct addrinfo hints;
  struct sockaddr_in6 conn;
  unsigned short rtalert_code = 0;      // alert type, 0 = MLD, 1 = RSVP, 2 = Active Network

  prg = argv[0];
  if (argc < 3 || strncmp(argv[1], "-h", 2) == 0 || strncmp(argv[1], "--h", 3) == 0)
    help();

  setvbuf(stdout, NULL, _IONBF, 0);
  setvbuf(stderr, NULL, _IONBF, 0);
  signal(SIGALRM, myalarm);

  if (getenv("THC_IPV6_PPPOE") != NULL || getenv("THC_IPV6_6IN4") != NULL)
    printf("WARNING: %s is not working with injection!\n", argv[0]);

  while ((i = getopt(argc, argv, "paA:iIOw:")) >= 0) {
    switch (i) {
    case 'w':
      waitms = atoi(optarg);
    case 'p':
      ping = 1;
      break;
    case 'a':
      do_alert = 1;
      break;
    case 'O':
      fastopen = 1;
      break;
    case 'A':
      do_alert = 1;
      rtalert_code = atoi(optarg);
      break;
    case 'i':
      interactive = 1;
      break;
    case 'I':
      interactive = 2;
      break;
    default:
      fprintf(stderr, "Error: invalid option %c\n", i);
      exit(-1);
    }
  }

  memset((char *) &hints, 0, sizeof(hints));
  hints.ai_socktype = SOCK_STREAM;
  hints.ai_family = AF_INET6;

  target = argv[optind];
  if ((interface = index(target, '%')) != NULL)
#ifdef SO_BINDTODEVICE
    *interface++ = 0;
#else
  {
    fprintf(stderr, "Error: your operating system does not support SO_BINDTODEVICE, so I can't bind to an interface!\n");
    exit(-1);
  }
#endif
  else if (strncmp(target, "fe80", 4) == 0) {
    fprintf(stderr, "Error: to connect to an fe80:: link local address, you must specify an interface, e.g. fe80::1%%eth0\n");
    exit(-1);
  }

  if ((i = getaddrinfo(target, argv[optind + 1], &hints, &res)) != 0) {
    fprintf(stderr, "Error: %s\n", gai_strerror(i));
    return -1;
  }

  conn_len = sizeof(conn);

  for (aip = res; aip != NULL; aip = aip->ai_next) {
    if (t == -1) {
      t = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
      if (t == -1) {
        perror("socket");
        freeaddrinfo(res);
        return (-1);
      }
#ifdef SO_BINDTODEVICE
      if (interface != NULL)
        if (setsockopt(t, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface) + 1) < 0)
          fprintf(stderr, "Warning: could not bind to device %s\n", interface);
#endif
      memset(buf, 0, 8);
      if (do_alert) {
        buf[2] = 5;
        buf[3] = 2;
        buf[4] = rtalert_code / 256;
        buf[5] = rtalert_code % 256;
        if (setsockopt(t, IPPROTO_IPV6, IPV6_HOPOPTS, buf, 8) != 0) {
          perror("setsockopt");
          if (ping == 0)
            exit(-1);
        }
      }
      if (fastopen) {
        printf("go\n");
        if (sendto(t, buf, 0, 0, aip->ai_addr, aip->ai_addrlen) < 0) {
          printf("error!\n");
          perror("sendto");
          (void) close(t);
          t = -1;
          continue;
        }
        printf("done\n");
      } else {
        if (waitms < 2000)
          alarm(2);
        else
          alarm(waitms / 1000);
        if (connect(t, aip->ai_addr, aip->ai_addrlen) == -1) {
          perror("connect");
          (void) close(t);
          t = -1;
          continue;
        } else
          aip_saved = aip;
        alarm(0);
      }
      break;
    }
  }

  if (t < 0) {
    fprintf(stderr, "Error: can not connect to target\n");
    exit(1);
  }

  if (ping == 0) {
    printf("Connected.\n");

    i = getsockopt(t, IPPROTO_IPV6, IPV6_MTU, &optval, &optlen);
    printf("MTU to target is %d (return code from getsockopt was %d)\n", optval, i);
    if (interactive == 1) {
      fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
      fcntl(t, F_SETFL, O_NONBLOCK);
      while (1) {
        if ((i = recv(t, buf, sizeof(buf), 0)) > 0)
          fwrite(buf, 1, i, stdout);
        if ((i = read(fileno(stdin), buf, sizeof(buf))) > 0)
          send(t, buf, i, 0);
        usleep(10);
      }
    } else if (interactive == 2) {
      snprintf(buf, sizeof(buf), "\r\n");       // do something else than enter maybe
      send(t, buf, strlen(buf), 0);
      alarm(3);
      if ((i = recv(t, buf, sizeof(buf), 0)) < 0) {
        close(t);
        return 0;
      }
      printf("%s\n", buf);
    }
  } else {
    fd_set myset;
    struct timeval tv;
    unsigned long int diff;

    close(t);
    printf("Connected seq=%lu\n", ping);
    while (1) {
      if ((t = socket(aip_saved->ai_family, aip_saved->ai_socktype, aip_saved->ai_protocol)) >= 0) {
#ifdef SO_BINDTODEVICE
        if (interface != NULL)
          if (setsockopt(t, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface) + 1) < 0)
            fprintf(stderr, "Warning: could not bind to device %s\n", interface);
#endif
        memset(buf, 0, 8);
        if (do_alert) {
          buf[2] = 5;
          buf[3] = 2;
          buf[4] = rtalert_code / 256;
          buf[5] = rtalert_code % 256;
          if (setsockopt(t, IPPROTO_IPV6, IPV6_HOPOPTS, buf, 8) != 0)
            perror("setsockopt");
        }
        fcntl(t, F_SETFL, O_NONBLOCK);
        ping++;
        connect(t, aip->ai_addr, aip->ai_addrlen);
        FD_ZERO(&myset);
        FD_SET(t, &myset);
        tv.tv_sec = waitms / 1000;
        tv.tv_usec = (waitms % 1000) * 1000;
        if (select(t + 1, NULL, &myset, NULL, &tv) > 0) {
          diff = (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
          printf("Connected seq=%lu %ds %dms\n", ping, (waitms - diff) / 1000, (waitms - diff) % 1000);
        }
        // wait for rest of timeout
        close(t);
        select(t + 1, NULL, NULL, NULL, &tv);
      }
    }
  }
  return 0;
}