/* $NetBSD: lsock.c,v 1.3 2002/03/14 12:32:40 martti Exp $ */ /* * lsock.c (C) 1995-1998 Darren Reed * * See the IPFILTER.LICENCE file for details on licencing. */ #if !defined(lint) static const char sccsid[] = "@(#)lsock.c 1.2 1/11/96 (C)1995 Darren Reed"; static const char rcsid[] = "@(#)Id: lsock.c,v 2.1.4.2 2002/02/22 15:32:58 darrenr Exp"; #endif #ifdef __sgi # include #endif #include #include #include #include #include #include #include #include #include #include #include #include #define __KERNEL__ #if LINUX >= 0200 # undef UINT_MAX # undef INT_MAX # undef ULONG_MAX # undef LONG_MAX # include #endif #include #if LINUX >= 0200 #include "linux/netdevice.h" #include "net/sock.h" #endif #undef __KERNEL__ #include #include #include #include #include #include #include #include #include #if LINUX < 0200 #include #endif #include "ipsend.h" int nproc; struct task_struct *proc; #ifndef KMEM # ifdef _PATH_KMEM # define KMEM _PATH_KMEM # endif #endif #ifndef KMEM # define KMEM "/dev/kmem" #endif #ifndef KERNEL # define KERNEL "/System.map" #endif int kmemcpy(buf, pos, n) char *buf; void *pos; int n; { static int kfd = -1; if (kfd == -1) kfd = open(KMEM, O_RDONLY); if (lseek(kfd, (off_t)pos, SEEK_SET) == -1) { perror("lseek"); return -1; } if (read(kfd, buf, n) == -1) { perror("read"); return -1; } return n; } struct nlist names[3] = { { "_task" }, { "_nr_tasks" }, { NULL } }; struct task_struct *getproc() { struct task_struct *p, **pp; void *v; pid_t pid = getpid(); int siz, n; n = nlist(KERNEL, names); if (n != 0) { fprintf(stderr, "nlist(%#x) == %d\n", names, n); return NULL; } if (KMCPY(&nproc, names[1].n_value, sizeof(nproc)) == -1) { fprintf(stderr, "read nproc (%#x)\n", names[1].n_value); return NULL; } siz = nproc * sizeof(struct task_struct *); if (KMCPY(&v, names[0].n_value, sizeof(v)) == -1) { fprintf(stderr, "read(%#x,%#x,%d) proc\n", names[0].n_value, &v, sizeof(v)); return NULL; } pp = (struct task_struct **)malloc(siz); if (KMCPY(pp, v, siz) == -1) { fprintf(stderr, "read(%#x,%#x,%d) proc\n", v, pp, siz); return NULL; } proc = (struct task_struct *)malloc(siz); for (n = 0; n < NR_TASKS; n++) { if (KMCPY((proc + n), pp[n], sizeof(*proc)) == -1) { fprintf(stderr, "read(%#x,%#x,%d) proc\n", pp[n], proc + n, sizeof(*proc)); return NULL; } } p = proc; for (n = NR_TASKS; n; n--, p++) if (p->pid == pid) break; if (!n) return NULL; return p; } struct sock *find_tcp(fd, ti) int fd; struct tcpiphdr *ti; { struct sock *s; struct inode *i; struct files_struct *fs; struct task_struct *p; struct file *f, **o; if (!(p = getproc())) return NULL; fs = p->files; o = (struct file **)calloc(1, sizeof(*o) * (fs->count + 1)); if (KMCPY(o, fs->fd, (fs->count + 1) * sizeof(*o)) == -1) { fprintf(stderr, "read(%#x,%#x,%d) - fd - failed\n", fs->fd, o, sizeof(*o)); return NULL; } f = (struct file *)calloc(1, sizeof(*f)); if (KMCPY(f, o[fd], sizeof(*f)) == -1) { fprintf(stderr, "read(%#x,%#x,%d) - o[fd] - failed\n", o[fd], f, sizeof(*f)); return NULL; } i = (struct inode *)calloc(1, sizeof(*i)); if (KMCPY(i, f->f_inode, sizeof(*i)) == -1) { fprintf(stderr, "read(%#x,%#x,%d) - f_inode - failed\n", f->f_inode, i, sizeof(*i)); return NULL; } return i->u.socket_i.data; } int do_socket(dev, mtu, ti, gwip) char *dev; int mtu; struct tcpiphdr *ti; struct in_addr gwip; { struct sockaddr_in rsin, lsin; struct sock *s, sk; int fd, nfd, len; printf("Dest. Port: %d\n", ti->ti_dport); fd = socket(AF_INET, SOCK_STREAM, 0); if (fd == -1) { perror("socket"); return -1; } if (fcntl(fd, F_SETFL, FNDELAY) == -1) { perror("fcntl"); return -1; } bzero((char *)&lsin, sizeof(lsin)); lsin.sin_family = AF_INET; bcopy((char *)&ti->ti_src, (char *)&lsin.sin_addr, sizeof(struct in_addr)); if (bind(fd, (struct sockaddr *)&lsin, sizeof(lsin)) == -1) { perror("bind"); return -1; } len = sizeof(lsin); (void) getsockname(fd, (struct sockaddr *)&lsin, &len); ti->ti_sport = lsin.sin_port; printf("sport %d\n", ntohs(lsin.sin_port)); nfd = initdevice(dev, ntohs(lsin.sin_port), 0); if (!(s = find_tcp(fd, ti))) return -1; bzero((char *)&rsin, sizeof(rsin)); rsin.sin_family = AF_INET; bcopy((char *)&ti->ti_dst, (char *)&rsin.sin_addr, sizeof(struct in_addr)); rsin.sin_port = ti->ti_dport; if (connect(fd, (struct sockaddr *)&rsin, sizeof(rsin)) == -1 && errno != EINPROGRESS) { perror("connect"); return -1; } KMCPY(&sk, s, sizeof(sk)); ti->ti_win = sk.window; ti->ti_seq = sk.sent_seq - 1; ti->ti_ack = sk.rcv_ack_seq; ti->ti_flags = TH_SYN; if (send_tcp(nfd, mtu, (ip_t *)ti, gwip) == -1) return -1; (void)write(fd, "Hello World\n", 12); sleep(2); close(fd); return 0; }