/* $OpenBSD: session.c,v 1.3 2004/05/06 20:29:04 deraadt Exp $ */ /* * Copyright (c) 2000 Network Security Technologies, Inc. http://www.netsec.net * * 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. * * 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 <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 "pppoe.h" struct pppoe_session_master session_master; void session_destroy(struct pppoe_session *s) { if (s->s_fd != -1) close(s->s_fd); LIST_REMOVE(s, s_next); free(s); } struct pppoe_session * session_new(struct ether_addr *ea) { struct pppoe_session *s; u_int32_t x; u_int16_t id = 1; int tries = 1000; if (session_master.sm_nsessions == PPPOE_MAXSESSIONS) return (NULL); while (tries--) { x = cookie_bake(); id = ((x >> 16) & 0xffff) ^ (x & 0xffff); s = LIST_FIRST(&session_master.sm_sessions); while (s) { if (memcmp(ea, &s->s_ea, ETHER_ADDR_LEN) == 0 && s->s_id == id) break; s = LIST_NEXT(s, s_next); } if (s == NULL) break; } if (tries == 0) return (NULL); s = (struct pppoe_session *)malloc(sizeof(*s)); if (s == NULL) return (NULL); s->s_id = id; s->s_fd = -1; s->s_first = 1; memcpy(&s->s_ea, ea, ETHER_ADDR_LEN); LIST_INSERT_HEAD(&session_master.sm_sessions, s, s_next); return (s); } struct pppoe_session * session_find_eaid(struct ether_addr *ea, u_int16_t id) { struct pppoe_session *s; s = LIST_FIRST(&session_master.sm_sessions); while (s) { if (memcmp(ea, &s->s_ea, ETHER_ADDR_LEN) == 0 && s->s_id == id) return (s); s = LIST_NEXT(s, s_next); } return (NULL); }