371 lines
8.1 KiB
C
371 lines
8.1 KiB
C
/*
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* sock.c (C) 1995 Darren Reed
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*
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* The author provides this program as-is, with no gaurantee for its
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* suitability for any specific purpose. The author takes no responsibility
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* for the misuse/abuse of this program and provides it for the sole purpose
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* of testing packet filter policies. This file maybe distributed freely
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* providing it is not modified and that this notice remains in tact.
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*/
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#if !defined(lint) && defined(LIBC_SCCS)
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static char sccsid[] = "@(#)sock.c 1.2 1/11/96 (C)1995 Darren Reed";
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <pwd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/dir.h>
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#define _KERNEL
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#define KERNEL
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#include <sys/file.h>
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#undef _KERNEL
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#undef KERNEL
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#include <nlist.h>
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#include <sys/user.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/proc.h>
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#include <kvm.h>
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#ifdef sun
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#include <sys/systm.h>
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#include <sys/session.h>
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#endif
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#if BSD >= 199103
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#include <sys/sysctl.h>
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#include <sys/filedesc.h>
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#include <paths.h>
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#endif
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#include <math.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_pcb.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcpip.h>
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int nproc;
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struct proc *proc;
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extern int initdevice(), send_tcp();
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#ifndef KMEM
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# ifdef _PATH_KMEM
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# define KMEM _PATH_KMEM
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# endif
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#endif
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#ifndef KERNEL
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# ifdef _PATH_UNIX
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# define KERNEL _PATH_UNIX
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# endif
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#endif
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#ifndef KMEM
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# define KMEM "/dev/kmem"
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#endif
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#ifndef KERNEL
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# define KERNEL "/vmunix"
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#endif
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int kmemcpy(buf, pos, n)
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char *buf;
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off_t pos;
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int n;
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{
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static int kfd = -1;
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if (kfd == -1)
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kfd = open(KMEM, O_RDONLY);
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if (lseek(kfd, pos, SEEK_SET) == -1)
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{
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perror("lseek");
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return -1;
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}
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if (read(kfd, buf, n) == -1)
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{
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perror("read");
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return -1;
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}
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return n;
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}
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struct nlist names[3] = {
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{ "_proc" },
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{ "_nproc" },
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{ NULL }
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};
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#if BSD < 199103
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struct proc *getproc()
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{
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struct proc *p;
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pid_t pid = getpid();
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int siz, n;
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n = nlist(KERNEL, names);
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if (n != 0)
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{
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fprintf(stderr, "nlist(%#x) == %d\n", names, n);
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return NULL;
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}
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if (kmemcpy((char *)&nproc, (off_t)names[1].n_value,
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sizeof(nproc)) == -1)
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{
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fprintf(stderr, "read nproc (%#x)\n", names[1].n_value);
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return NULL;
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}
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siz = nproc * sizeof(struct proc);
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if (kmemcpy((char *)&p, (off_t)names[0].n_value, sizeof(p)) == -1)
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{
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fprintf(stderr, "read(%#x,%#x,%d) proc\n",
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names[0].n_value, &p, sizeof(p));
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return NULL;
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}
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proc = (struct proc *)malloc(siz);
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if (kmemcpy((char *)proc, (off_t)p, siz) == -1)
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{
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fprintf(stderr, "read(%#x,%#x,%d) proc\n",
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p, proc, siz);
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return NULL;
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}
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p = proc;
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for (n = nproc; n; n--, p++)
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if (p->p_pid == pid)
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break;
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if (!n)
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return NULL;
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return p;
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}
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struct tcpcb *find_tcp(fd, ti)
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int fd;
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struct tcpiphdr *ti;
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{
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struct tcpcb *t;
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struct inpcb *i;
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struct socket *s;
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struct user *up;
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struct proc *p;
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struct file *f, **o;
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if (!(p = getproc()))
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return NULL;
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up = (struct user *)malloc(sizeof(*up));
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if (kmemcpy((char *)up, (off_t)p->p_uarea, sizeof(*up)) == -1)
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{
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fprintf(stderr, "read(%#x,%#x) failed\n", p, p->p_uarea);
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return NULL;
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}
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o = (struct file **)calloc(1, sizeof(*o) * (up->u_lastfile + 1));
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if (kmemcpy((char *)o, (off_t)up->u_ofile,
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(up->u_lastfile + 1) * sizeof(*o)) == -1)
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{
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fprintf(stderr, "read(%#x,%#x,%d) - u_ofile - failed\n",
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up->u_ofile_arr, o, sizeof(*o));
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return NULL;
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}
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f = (struct file *)calloc(1, sizeof(*f));
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if (kmemcpy((char *)f, (off_t)o[fd], sizeof(*f)) == -1)
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{
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fprintf(stderr, "read(%#x,%#x,%d) - o[fd] - failed\n",
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up->u_ofile_arr[fd], f, sizeof(*f));
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return NULL;
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}
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s = (struct socket *)calloc(1, sizeof(*s));
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if (kmemcpy((char *)s, (off_t)f->f_data, sizeof(*s)) == -1)
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{
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fprintf(stderr, "read(%#x,%#x,%d) - f_data - failed\n",
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o[fd], s, sizeof(*s));
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return NULL;
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}
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i = (struct inpcb *)calloc(1, sizeof(*i));
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if (kmemcpy((char *)i, (off_t)s->so_pcb, sizeof(*i)) == -1)
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{
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fprintf(stderr, "kvm_read(%#x,%#x,%d) - so_pcb - failed\n",
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s->so_pcb, i, sizeof(*i));
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return NULL;
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}
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t = (struct tcpcb *)calloc(1, sizeof(*t));
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if (kmemcpy((char *)t, (off_t)i->inp_ppcb, sizeof(*t)) == -1)
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{
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fprintf(stderr, "read(%#x,%#x,%d) - inp_ppcb - failed\n",
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i->inp_ppcb, t, sizeof(*t));
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return NULL;
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}
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return (struct tcpcb *)i->inp_ppcb;
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}
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#else
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struct kinfo_proc *getproc()
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{
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static struct kinfo_proc kp;
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pid_t pid = getpid();
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int n, mib[4];
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PID;
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mib[3] = pid;
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n = 1;
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if (sysctl(mib, 4, &kp, &n, NULL, 0) == -1)
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{
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perror("sysctl");
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return NULL;
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}
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return &kp;
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}
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struct tcpcb *find_tcp(tfd, ti)
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int tfd;
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struct tcpiphdr *ti;
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{
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struct tcpcb *t;
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struct inpcb *i;
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struct socket *s;
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struct filedesc *fd;
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struct kinfo_proc *p;
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struct file *f, **o;
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if (!(p = getproc()))
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return NULL;
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fd = (struct filedesc *)malloc(sizeof(*fd));
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if (kmemcpy((char *)fd, (void *)p->kp_proc.p_fd, sizeof(*fd)) == -1)
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{
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fprintf(stderr, "read(%#lx,%#lx) failed\n",
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(u_long)p, (u_long)p->kp_proc.p_fd);
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return NULL;
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}
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o = (struct file **)calloc(1, sizeof(*o) * (fd->fd_lastfile + 1));
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if (kmemcpy((char *)o, (void *)fd->fd_ofiles,
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(fd->fd_lastfile + 1) * sizeof(*o)) == -1)
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{
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fprintf(stderr, "read(%#lx,%#lx,%d) - u_ofile - failed\n",
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(u_long)fd->fd_ofiles, (u_long)o, sizeof(*o));
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return NULL;
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}
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f = (struct file *)calloc(1, sizeof(*f));
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if (kmemcpy((char *)f, (void *)o[tfd], sizeof(*f)) == -1)
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{
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fprintf(stderr, "read(%#lx,%#lx,%d) - o[tfd] - failed\n",
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(u_long)o[tfd], (u_long)f, sizeof(*f));
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return NULL;
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}
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s = (struct socket *)calloc(1, sizeof(*s));
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if (kmemcpy((char *)s, (void *)f->f_data, sizeof(*s)) == -1)
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{
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fprintf(stderr, "read(%#lx,%#lx,%d) - f_data - failed\n",
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(u_long)f->f_data, (u_long)s, sizeof(*s));
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return NULL;
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}
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i = (struct inpcb *)calloc(1, sizeof(*i));
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if (kmemcpy((char *)i, (void *)s->so_pcb, sizeof(*i)) == -1)
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{
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fprintf(stderr, "kvm_read(%#lx,%#lx,%d) - so_pcb - failed\n",
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(u_long)s->so_pcb, (u_long)i, sizeof(*i));
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return NULL;
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}
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t = (struct tcpcb *)calloc(1, sizeof(*t));
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if (kmemcpy((char *)t, (void *)i->inp_ppcb, sizeof(*t)) == -1)
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{
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fprintf(stderr, "read(%#lx,%#lx,%d) - inp_ppcb - failed\n",
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(u_long)i->inp_ppcb, (u_long)t, sizeof(*t));
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return NULL;
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}
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return (struct tcpcb *)i->inp_ppcb;
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}
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#endif /* BSD < 199301 */
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int do_socket(dev, mtu, ti, gwip, flags)
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char *dev;
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int mtu;
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struct tcpiphdr *ti;
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struct in_addr gwip;
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int flags;
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{
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struct sockaddr_in rsin, lsin;
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struct tcpcb *t, tcb;
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int fd, nfd, len;
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printf("Dest. Port: %d\n", ti->ti_dport);
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fd = socket(AF_INET, SOCK_STREAM, 0);
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if (fd == -1)
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{
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perror("socket");
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return -1;
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}
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if (fcntl(fd, F_SETFL, FNDELAY) == -1)
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{
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perror("fcntl");
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return -1;
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}
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bzero((char *)&lsin, sizeof(lsin));
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lsin.sin_family = AF_INET;
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bcopy((char *)&ti->ti_src, (char *)&lsin.sin_addr,
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sizeof(struct in_addr));
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if (bind(fd, (struct sockaddr *)&lsin, sizeof(lsin)) == -1)
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{
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perror("bind");
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return -1;
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}
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len = sizeof(lsin);
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(void) getsockname(fd, (struct sockaddr *)&lsin, &len);
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ti->ti_sport = lsin.sin_port;
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printf("sport %d\n", ntohs(lsin.sin_port));
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nfd = initdevice(dev, ntohs(lsin.sin_port));
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if (!(t = find_tcp(fd, ti)))
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return -1;
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bzero((char *)&rsin, sizeof(rsin));
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rsin.sin_family = AF_INET;
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bcopy((char *)&ti->ti_dst, (char *)&rsin.sin_addr,
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sizeof(struct in_addr));
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rsin.sin_port = ti->ti_dport;
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if (connect(fd, (struct sockaddr *)&rsin, sizeof(rsin)) == -1 &&
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errno != EINPROGRESS)
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{
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perror("connect");
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return -1;
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}
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kmemcpy((char*)&tcb, (void *)t, sizeof(tcb));
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ti->ti_win = tcb.rcv_adv;
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ti->ti_seq = tcb.snd_nxt - 1;
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ti->ti_ack = tcb.rcv_nxt;
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if (send_tcp(nfd, mtu, ti, gwip, TH_SYN) == -1)
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return -1;
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(void)write(fd, "Hello World\n", 12);
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sleep(2);
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close(fd);
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return 0;
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}
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