contrib/ipfilter/ipsend/lsock.c

   1 /*
   2  * lsock.c (C) 1995-1998 Darren Reed
   3  *
   4  * See the IPFILTER.LICENCE file for details on licencing.
   5  */
   6 #if !defined(lint)
   7 static const char sccsid[] = "@(#)lsock.c       1.2 1/11/96 (C)1995 Darren Reed";
   8 static const char rcsid[] = "@(#)$Id: lsock.c,v 2.1.4.3 2002/12/06 11:40:36 darrenr Exp $";
   9 #endif
  10 #if defined(__sgi) && (IRIX > 602)
  11 # include <sys/ptimers.h>
  12 #endif
  13 #include <stdio.h>
  14 #include <unistd.h>
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stddef.h>
  18 #include <pwd.h>
  19 #include <sys/types.h>
  20 #include <sys/time.h>
  21 #include <sys/param.h>
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24 #include <sys/dir.h>
  25 #define __KERNEL__
  26 #if LINUX >= 0200
  27 # undef UINT_MAX
  28 # undef INT_MAX
  29 # undef ULONG_MAX
  30 # undef LONG_MAX
  31 # include <linux/notifier.h>
  32 #endif
  33 #include <linux/fs.h>
  34 #if LINUX >= 0200
  35 #include "linux/netdevice.h"
  36 #include "net/sock.h"
  37 #endif
  38 #undef  __KERNEL__
  39 #include <linux/sched.h>
  40 #include <linux/netdevice.h>
  41 #include <nlist.h>
  42 #include <sys/user.h>
  43 #include <sys/socket.h>
  44 #include <math.h>
  45 #include <netinet/in.h>
  46 #include <netinet/in_systm.h>
  47 #include <net/if.h>
  48 #if LINUX < 0200
  49 #include <net/inet/sock.h>
  50 #endif
  51 #include "ipsend.h"
  52
  53 int     nproc;
  54 struct  task_struct     *proc;
  55
  56 #ifndef KMEM
  57 # ifdef _PATH_KMEM
  58 #  define       KMEM    _PATH_KMEM
  59 # endif
  60 #endif
  61 #ifndef KMEM
  62 # define        KMEM    "/dev/kmem"
  63 #endif
  64 #ifndef KERNEL
  65 # define        KERNEL  "/System.map"
  66 #endif
  67
  68 int     kmemcpy(buf, pos, n)
  69 char    *buf;
  70 void    *pos;
  71 int     n;
  72 {
  73         static  int     kfd = -1;
  74
  75         if (kfd == -1)
  76                 kfd = open(KMEM, O_RDONLY);
  77
  78         if (lseek(kfd, (off_t)pos, SEEK_SET) == -1)
  79             {
  80                 perror("lseek");
  81                 return -1;
  82             }
  83         if (read(kfd, buf, n) == -1)
  84             {
  85                 perror("read");
  86                 return -1;
  87             }
  88         return n;
  89 }
  90
  91 struct  nlist   names[3] = {
  92         { "_task" },
  93         { "_nr_tasks" },
  94         { NULL }
  95         };
  96
  97 struct  task_struct     *getproc()
  98 {
  99         struct  task_struct     *p, **pp;
 100         void    *v;
 101         pid_t   pid = getpid();
 102         int     siz, n;
 103
 104         n = nlist(KERNEL, names);
 105         if (n != 0)
 106             {
 107                 fprintf(stderr, "nlist(%#x) == %d\n", names, n);
 108                 return NULL;
 109             }
 110         if (KMCPY(&nproc, names[1].n_value, sizeof(nproc)) == -1)
 111             {
 112                 fprintf(stderr, "read nproc (%#x)\n", names[1].n_value);
 113                 return NULL;
 114             }
 115         siz = nproc * sizeof(struct task_struct *);
 116         if (KMCPY(&v, names[0].n_value, sizeof(v)) == -1)
 117             {
 118                 fprintf(stderr, "read(%#x,%#x,%d) proc\n",
 119                         names[0].n_value, &v, sizeof(v));
 120                 return NULL;
 121             }
 122         pp = (struct task_struct **)malloc(siz);
 123         if (KMCPY(pp, v, siz) == -1)
 124             {
 125                 fprintf(stderr, "read(%#x,%#x,%d) proc\n",
 126                         v, pp, siz);
 127                 return NULL;
 128             }
 129         proc = (struct task_struct *)malloc(siz);
 130         for (n = 0; n < NR_TASKS; n++)
 131             {
 132                 if (KMCPY((proc + n), pp[n], sizeof(*proc)) == -1)
 133                     {
 134                         fprintf(stderr, "read(%#x,%#x,%d) proc\n",
 135                                 pp[n], proc + n, sizeof(*proc));
 136                         return NULL;
 137                     }
 138             }
 139
 140         p = proc;
 141
 142         for (n = NR_TASKS; n; n--, p++)
 143                 if (p->pid == pid)
 144                         break;
 145         if (!n)
 146                 return NULL;
 147
 148         return p;
 149 }
 150
 151
 152 struct  sock    *find_tcp(fd, ti)
 153 int     fd;
 154 struct  tcpiphdr *ti;
 155 {
 156         struct  sock    *s;
 157         struct  inode   *i;
 158         struct  files_struct    *fs;
 159         struct  task_struct     *p;
 160         struct  file    *f, **o;
 161
 162         if (!(p = getproc()))
 163                 return NULL;
 164
 165         fs = p->files;
 166         o = (struct file **)calloc(1, sizeof(*o) * (fs->count + 1));
 167         if (KMCPY(o, fs->fd, (fs->count + 1) * sizeof(*o)) == -1)
 168             {
 169                 fprintf(stderr, "read(%#x,%#x,%d) - fd - failed\n",
 170                         fs->fd, o, sizeof(*o));
 171                 return NULL;
 172             }
 173         f = (struct file *)calloc(1, sizeof(*f));
 174         if (KMCPY(f, o[fd], sizeof(*f)) == -1)
 175             {
 176                 fprintf(stderr, "read(%#x,%#x,%d) - o[fd] - failed\n",
 177                         o[fd], f, sizeof(*f));
 178                 return NULL;
 179             }
 180
 181         i = (struct inode *)calloc(1, sizeof(*i));
 182         if (KMCPY(i, f->f_inode, sizeof(*i)) == -1)
 183             {
 184                 fprintf(stderr, "read(%#x,%#x,%d) - f_inode - failed\n",
 185                         f->f_inode, i, sizeof(*i));
 186                 return NULL;
 187             }
 188         return i->u.socket_i.data;
 189 }
 190
 191 int     do_socket(dev, mtu, ti, gwip)
 192 char    *dev;
 193 int     mtu;
 194 struct  tcpiphdr *ti;
 195 struct  in_addr gwip;
 196 {
 197         struct  sockaddr_in     rsin, lsin;
 198         struct  sock    *s, sk;
 199         int     fd, nfd, len;
 200
 201         printf("Dest. Port: %d\n", ti->ti_dport);
 202
 203         fd = socket(AF_INET, SOCK_STREAM, 0);
 204         if (fd == -1)
 205             {
 206                 perror("socket");
 207                 return -1;
 208             }
 209
 210         if (fcntl(fd, F_SETFL, FNDELAY) == -1)
 211             {
 212                 perror("fcntl");
 213                 return -1;
 214             }
 215
 216         bzero((char *)&lsin, sizeof(lsin));
 217         lsin.sin_family = AF_INET;
 218         bcopy((char *)&ti->ti_src, (char *)&lsin.sin_addr,
 219               sizeof(struct in_addr));
 220         if (bind(fd, (struct sockaddr *)&lsin, sizeof(lsin)) == -1)
 221             {
 222                 perror("bind");
 223                 return -1;
 224             }
 225         len = sizeof(lsin);
 226         (void) getsockname(fd, (struct sockaddr *)&lsin, &len);
 227         ti->ti_sport = lsin.sin_port;
 228         printf("sport %d\n", ntohs(lsin.sin_port));
 229         nfd = initdevice(dev, ntohs(lsin.sin_port), 0);
 230
 231         if (!(s = find_tcp(fd, ti)))
 232                 return -1;
 233
 234         bzero((char *)&rsin, sizeof(rsin));
 235         rsin.sin_family = AF_INET;
 236         bcopy((char *)&ti->ti_dst, (char *)&rsin.sin_addr,
 237               sizeof(struct in_addr));
 238         rsin.sin_port = ti->ti_dport;
 239         if (connect(fd, (struct sockaddr *)&rsin, sizeof(rsin)) == -1 &&
 240             errno != EINPROGRESS)
 241             {
 242                 perror("connect");
 243                 return -1;
 244             }
 245         KMCPY(&sk, s, sizeof(sk));
 246         ti->ti_win = sk.window;
 247         ti->ti_seq = sk.sent_seq - 1;
 248         ti->ti_ack = sk.rcv_ack_seq;
 249         ti->ti_flags = TH_SYN;
 250
 251         if (send_tcp(nfd, mtu, (ip_t *)ti, gwip) == -1)
 252                 return -1;
 253         (void)write(fd, "Hello World\n", 12);
 254         sleep(2);
 255         close(fd);
 256         return 0;
 257 }