import my pppoe code

1 files changed, 420 insertions, 0 deletions

diff --git a/usr.sbin/pppoe/pppoe.c b/usr.sbin/pppoe/pppoe.c
new file mode 100644
index 00000000000..ab1e89a0efd
--- /dev/null
+++ b/usr.sbin/pppoe/pppoe.c
@@ -0,0 +1,420 @@
+/*	$OpenBSD: pppoe.c,v 1.1 2000/06/18 07:30:41 jason Exp $	*/
+
+/*
+ * Copyright (c) 2000 Network Security Technologies, Inc. http://www.netsec.net
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Network Security
+ *	Technologies, Inc.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+#include <net/bpf.h>
+#include <errno.h>
+#include <string.h>
+#include <err.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sysexits.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#include "pppoe.h"
+
+int option_verbose = 0;
+u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+int main __P((int, char **));
+void usage __P((char *));
+int getifhwaddr __P((char *, char *, struct ether_addr *));
+int setupfilter __P((char *, struct ether_addr *, int));
+void child_handler __P((int));
+int signal_init __P((void));
+
+int
+main(int argc, char **argv) {
+	char *ifname = NULL, *sysname = NULL, *srvname = NULL;
+	char ifnambuf[IFNAMSIZ];
+	struct ether_addr ea;
+	int bpffd, smode = 0, c;
+
+	while ((c = getopt(argc, argv, "svi:n:p:")) != -1) {
+		switch (c) {
+		case 'i':
+			if (ifname != NULL) {
+				usage(argv[0]);
+				return (EX_USAGE);
+			}
+			ifname = optarg;
+			break;
+		case 'n':
+			if (srvname != NULL) {
+				usage(argv[0]);
+				return (EX_USAGE);
+			}
+			srvname = optarg;
+			break;
+		case 'p':
+			if (sysname != NULL) {
+				usage(argv[0]);
+				return (EX_USAGE);
+			}
+			sysname = optarg;
+			break;
+		case 's':
+			if (smode) {
+				usage(argv[0]);
+				return (EX_USAGE);
+			}
+			smode = 1;
+			break;
+		case 'v':
+			option_verbose++;
+			break;
+		default:
+			usage(argv[0]);
+			return (EX_USAGE);
+		}
+	}
+
+	argc -= optind;
+	if (argc != 0) {
+		usage(argv[0]);
+		return (EX_USAGE);
+	}
+
+	if (getifhwaddr(ifname, ifnambuf, &ea) < 0)
+		return (EX_IOERR);
+
+	bpffd = setupfilter(ifnambuf, &ea, smode);
+	if (bpffd < 0)
+		return (EX_IOERR);
+
+	signal_init();
+
+	if (smode)
+		server_mode(bpffd, sysname, srvname, &ea);
+	else
+		client_mode(bpffd, sysname, srvname, &ea);
+
+	return (0);
+}
+
+int
+setupfilter(ifn, ea, server_mode)
+	char *ifn;
+	struct ether_addr *ea;
+	int server_mode;
+{
+	char device[sizeof "/dev/bpf0000000000"];
+	u_int8_t *ep = (u_int8_t *)ea;
+	int fd, idx = 0;
+	u_int u, i;
+	struct ifreq ifr;
+	struct bpf_insn insns[20];
+	struct bpf_program filter;
+
+	idx = 0;
+
+	insns[idx].code = BPF_LD | BPF_H | BPF_ABS;
+	insns[idx].k = 12;
+	insns[idx].jt = insns[idx].jf = 0;
+	idx++;
+
+	insns[idx].code = BPF_JMP | BPF_JEQ | BPF_K;
+	insns[idx].k = ETHERTYPE_PPPOE;
+	insns[idx].jt = 1;
+	insns[idx].jf = 0;
+	idx++;
+
+	insns[idx].code = BPF_JMP | BPF_JEQ | BPF_K;
+	insns[idx].k = ETHERTYPE_PPPOEDISC;
+	insns[idx].jt = 0;
+	insns[idx].jf = 4;
+	idx++;
+
+	insns[idx].code = BPF_LD | BPF_W | BPF_ABS;
+	insns[idx].k = 6;
+	insns[idx].jt = insns[idx].jf = 0;
+	idx++;
+
+	insns[idx].code = BPF_JMP | BPF_JEQ | BPF_K;
+	insns[idx].k =
+	    (ep[0] << 24) | (ep[1] << 16) | (ep[2] << 8) | (ep[3] << 0);
+	insns[idx].jt = 0;
+	insns[idx].jf = 3;
+	idx++;
+
+	insns[idx].code = BPF_LD | BPF_H | BPF_ABS;
+	insns[idx].k = 10;
+	insns[idx].jt = insns[idx].jf = 0;
+	idx++;
+
+	insns[idx].code = BPF_JMP | BPF_JEQ | BPF_K;
+	insns[idx].k = ep[4] << 8 | ep[5];
+	insns[idx].jt = 0;
+	insns[idx].jf = 1;
+	idx++;
+
+	insns[idx].code = BPF_RET | BPF_K;
+	insns[idx].k = insns[idx].jt = insns[idx].jf = 0;
+	idx++;
+
+	if (server_mode) {
+		insns[idx].code = BPF_LD | BPF_W | BPF_ABS;
+		insns[idx].k = insns[idx].jt = insns[idx].jf = 0;
+		idx++;
+
+		insns[idx].code = BPF_JMP | BPF_JEQ | BPF_K;
+		insns[idx].k = 0xffffffff;
+		insns[idx].jt = 0;
+		insns[idx].jf = 3;
+		idx++;
+
+		insns[idx].code = BPF_LD | BPF_H | BPF_ABS;
+		insns[idx].k = 4;
+		insns[idx].jt = insns[idx].jf = 0;
+		idx++;
+
+		insns[idx].code = BPF_JMP | BPF_JEQ | BPF_K;
+		insns[idx].k = 0xffff;
+		insns[idx].jt = 4;
+		insns[idx].jf = 0;
+		idx++;
+	}
+
+	insns[idx].code = BPF_LD | BPF_W | BPF_ABS;
+	insns[idx].k = insns[idx].jt = insns[idx].jf = 0;
+	idx++;
+
+	insns[idx].code = BPF_JMP | BPF_JEQ | BPF_K;
+	insns[idx].k = (ep[0]) | (ep[1] << 8) | (ep[3] << 16) | (ep[3] << 24);
+	insns[idx].jt = 0;
+	insns[idx].jf = 3;
+	idx++;
+
+	insns[idx].code = BPF_LD | BPF_H | BPF_ABS;
+	insns[idx].k = 4;
+	insns[idx].jt = insns[idx].jf = 0;
+	idx++;
+
+	insns[idx].code = BPF_JMP | BPF_JEQ | BPF_K;
+	insns[idx].k = (ep[4]) | (ep[5] << 8);
+	insns[idx].jt = 0;
+	insns[idx].jf = 1;
+	idx++;
+
+	insns[idx].code = BPF_RET | BPF_K;
+	insns[idx].k = (u_int)-1;
+	insns[idx].jt = insns[idx].jf = 0;
+	idx++;
+
+	insns[idx].code = BPF_RET | BPF_K;
+	insns[idx].k = (u_int)-1;
+	insns[idx].jt = 0;
+	insns[idx].jf = 0;
+	idx++;
+
+	filter.bf_len = idx;
+	filter.bf_insns = insns;
+
+	for (i = 0; 1; i++) {
+		snprintf(device, sizeof(device), "/dev/bpf%d", i++);
+		fd = open(device, O_RDWR);
+		if (fd < 0) {
+			if (errno != EBUSY)
+				err(EX_IOERR, "%s", device);
+		}
+		else
+			break;
+	}
+
+	u = PPPOE_BPF_BUFSIZ;
+	if (ioctl(fd, BIOCSBLEN, &u) < 0) {
+		close(fd);
+		err(EX_IOERR, "set snaplength");
+	}
+
+	u = 1;
+	if (ioctl(fd, BIOCIMMEDIATE, &u) < 0) {
+		close(fd);
+		err(EX_IOERR, "set immediate");
+	}
+
+	strncpy(ifr.ifr_name, ifn, sizeof(ifr.ifr_name));
+	ifr.ifr_name[sizeof(ifr.ifr_name)-1] = '\0';
+	if (ioctl(fd, BIOCSETIF, &ifr) < 0) {
+		close(fd);
+		err(EX_IOERR, "set interface");
+	}
+
+	if (ioctl(fd, BIOCGDLT, &u) < 0) {
+		close(fd);
+		err(EX_IOERR, "get interface type");
+	}
+	if (u != DLT_EN10MB)
+		err(EX_IOERR, "%s is not ethernet", ifn);
+
+	if (ioctl(fd, BIOCSETF, &filter) < 0) {
+		close(fd);
+		err(EX_IOERR, "BIOCSETF");
+	}
+
+	return (fd);
+}
+
+int
+getifhwaddr(ifnhint, ifnambuf, ea)
+	char *ifnhint, *ifnambuf;
+	struct ether_addr *ea;
+{
+	int s;
+	char *inbuf = NULL;
+	struct ifconf ifc;
+	struct ifreq *ifrp, ifreq, req;
+	struct sockaddr_dl *dl;
+	int len = 8192, i;
+
+	s = socket(AF_INET, SOCK_DGRAM, 0);
+	if (s < 0) {
+		perror("socket");
+		return (-1);
+	}
+
+	while (1) {
+		ifc.ifc_len= len;
+		ifc.ifc_buf = inbuf = realloc(inbuf, len);
+		if (inbuf == NULL)
+			err(1, "malloc");
+		if (ioctl(s, SIOCGIFCONF, &ifc) < 0)
+			err(1, "gifconf");
+		if (ifc.ifc_len + sizeof(struct ifreq) < len)
+			break;
+		len *= 2;
+	}
+
+	ifrp = ifc.ifc_req;
+	ifreq.ifr_name[0] = '\0';
+	for (i = 0; i < ifc.ifc_len; ) {
+		ifrp = (struct ifreq *)((caddr_t)ifc.ifc_req + i);
+		i += sizeof(ifrp->ifr_name) +
+		    (ifrp->ifr_addr.sa_len > sizeof(struct sockaddr) ?
+		    ifrp->ifr_addr.sa_len : sizeof(struct sockaddr));
+		if (ifrp->ifr_addr.sa_family != AF_LINK)
+			continue;
+		if (ifnhint != NULL && strncmp(ifnhint, ifrp->ifr_name,
+		    sizeof(ifrp->ifr_name)))
+			continue;
+		if (ifnhint == NULL) {
+			strncpy(req.ifr_name, ifrp->ifr_name, IFNAMSIZ);
+			req.ifr_name[IFNAMSIZ-1] = '\0';
+			if (ioctl(s, SIOCGIFFLAGS, &req) < 0)
+				err(EX_IOERR, "get flags");
+			if ((req.ifr_flags & IFF_UP) == 0)
+				continue;
+		}
+		dl = (struct sockaddr_dl *)&ifrp->ifr_addr;
+		if (dl->sdl_type != IFT_ETHER) {
+			if (ifnhint == NULL)
+				continue;
+			fprintf(stderr, "not ethernet interface: %s\n",
+				ifnhint);
+			free(inbuf);
+			close(s);
+			return (-1);
+		}
+		if (dl->sdl_alen != ETHER_ADDR_LEN) {
+			fprintf(stderr, "invalid hwaddr len: %u\n",
+				dl->sdl_alen);
+			free(inbuf);
+			close(s);
+			return (-1);
+		}
+		bcopy(dl->sdl_data + dl->sdl_nlen, ea, sizeof(*ea));
+		strncpy(ifnambuf, ifrp->ifr_name, IFNAMSIZ);
+		ifnambuf[IFNAMSIZ-1] = '\0';
+		free(inbuf);
+		close(s);
+		return (0);
+	}
+	free(inbuf);
+	if (ifnhint == NULL)
+		fprintf(stderr, "no running ethernet found\n");
+	else
+		fprintf(stderr, "no such interface: %s\n", ifnhint);
+	close(s);
+	return (-1);
+}
+
+void
+usage(progname)
+	char *progname;
+{
+	fprintf(stderr, "%s [-s] [-v] [-p system] [-i interface]\n", progname);
+}
+
+void
+child_handler(sig)
+	int sig;
+{
+	int status;
+
+	while (wait3(&status, WNOHANG, NULL) > 0);
+}
+
+int
+signal_init()
+{
+	struct sigaction act;
+
+	if (sigemptyset(&act.sa_mask) < 0)
+		return (-1);
+	act.sa_flags = SA_RESTART;
+	act.sa_handler = child_handler;
+	if (sigaction(SIGCHLD, &act, NULL) < 0)
+		return (-1);
+
+	if (sigemptyset(&act.sa_mask) < 0)
+		return (-1);
+	act.sa_flags = 0;
+	act.sa_handler = SIG_IGN;
+	if (sigaction(SIGPIPE, &act, NULL) < 0)
+		return (-1);
+
+	return (0);
+}