1 /* $OpenBSD: logmsg.c,v 1.7 2022/06/28 11:42:41 claudio Exp $ */ 2 3 /* 4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <errno.h> 20 #include <stdarg.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <sys/types.h> 25 #include <syslog.h> 26 27 #include "bgpd.h" 28 #include "session.h" 29 #include "log.h" 30 31 char * 32 log_fmt_peer(const struct peer_config *peer) 33 { 34 const char *ip; 35 char *pfmt, *p; 36 37 ip = log_addr(&peer->remote_addr); 38 if ((peer->remote_addr.aid == AID_INET && peer->remote_masklen != 32) || 39 (peer->remote_addr.aid == AID_INET6 && 40 peer->remote_masklen != 128)) { 41 if (asprintf(&p, "%s/%u", ip, peer->remote_masklen) == -1) 42 fatal(NULL); 43 } else { 44 if ((p = strdup(ip)) == NULL) 45 fatal(NULL); 46 } 47 48 if (peer->descr[0]) { 49 if (asprintf(&pfmt, "neighbor %s (%s)", p, peer->descr) == 50 -1) 51 fatal(NULL); 52 } else { 53 if (asprintf(&pfmt, "neighbor %s", p) == -1) 54 fatal(NULL); 55 } 56 free(p); 57 return (pfmt); 58 } 59 60 void 61 log_peer_info(const struct peer_config *peer, const char *emsg, ...) 62 { 63 char *p, *nfmt; 64 va_list ap; 65 66 p = log_fmt_peer(peer); 67 if (asprintf(&nfmt, "%s: %s", p, emsg) == -1) 68 fatal(NULL); 69 va_start(ap, emsg); 70 vlog(LOG_INFO, nfmt, ap); 71 va_end(ap); 72 free(p); 73 free(nfmt); 74 } 75 76 void 77 log_peer_warn(const struct peer_config *peer, const char *emsg, ...) 78 { 79 char *p, *nfmt; 80 va_list ap; 81 82 p = log_fmt_peer(peer); 83 if (emsg == NULL) { 84 if (asprintf(&nfmt, "%s: %s", p, strerror(errno)) == -1) 85 fatal(NULL); 86 } else { 87 if (asprintf(&nfmt, "%s: %s: %s", p, emsg, strerror(errno)) == 88 -1) 89 fatal(NULL); 90 } 91 va_start(ap, emsg); 92 vlog(LOG_ERR, nfmt, ap); 93 va_end(ap); 94 free(p); 95 free(nfmt); 96 } 97 98 void 99 log_peer_warnx(const struct peer_config *peer, const char *emsg, ...) 100 { 101 char *p, *nfmt; 102 va_list ap; 103 104 p = log_fmt_peer(peer); 105 if (asprintf(&nfmt, "%s: %s", p, emsg) == -1) 106 fatal(NULL); 107 va_start(ap, emsg); 108 vlog(LOG_ERR, nfmt, ap); 109 va_end(ap); 110 free(p); 111 free(nfmt); 112 } 113 114 void 115 log_statechange(struct peer *peer, enum session_state nstate, 116 enum session_events event) 117 { 118 char *p; 119 120 /* don't clutter the logs with constant Connect -> Active -> Connect */ 121 if (nstate == STATE_CONNECT && peer->state == STATE_ACTIVE && 122 peer->prev_state == STATE_CONNECT) 123 return; 124 if (nstate == STATE_ACTIVE && peer->state == STATE_CONNECT && 125 peer->prev_state == STATE_ACTIVE) 126 return; 127 128 peer->lasterr = 0; 129 p = log_fmt_peer(&peer->conf); 130 logit(LOG_INFO, "%s: state change %s -> %s, reason: %s", 131 p, statenames[peer->state], statenames[nstate], eventnames[event]); 132 free(p); 133 } 134 135 void 136 log_notification(const struct peer *peer, uint8_t errcode, uint8_t subcode, 137 u_char *data, uint16_t datalen, const char *dir) 138 { 139 char *p; 140 const char *suberrname = NULL; 141 int uk = 0; 142 143 p = log_fmt_peer(&peer->conf); 144 switch (errcode) { 145 case ERR_HEADER: 146 if (subcode >= sizeof(suberr_header_names) / sizeof(char *) || 147 suberr_header_names[subcode] == NULL) 148 uk = 1; 149 else 150 suberrname = suberr_header_names[subcode]; 151 break; 152 case ERR_OPEN: 153 if (subcode >= sizeof(suberr_open_names) / sizeof(char *) || 154 suberr_open_names[subcode] == NULL) 155 uk = 1; 156 else 157 suberrname = suberr_open_names[subcode]; 158 break; 159 case ERR_UPDATE: 160 if (subcode >= sizeof(suberr_update_names) / sizeof(char *) || 161 suberr_update_names[subcode] == NULL) 162 uk = 1; 163 else 164 suberrname = suberr_update_names[subcode]; 165 break; 166 case ERR_CEASE: 167 if (subcode >= sizeof(suberr_cease_names) / sizeof(char *) || 168 suberr_cease_names[subcode] == NULL) 169 uk = 1; 170 else 171 suberrname = suberr_cease_names[subcode]; 172 break; 173 case ERR_HOLDTIMEREXPIRED: 174 if (subcode != 0) 175 uk = 1; 176 break; 177 case ERR_FSM: 178 if (subcode >= sizeof(suberr_fsm_names) / sizeof(char *) || 179 suberr_fsm_names[subcode] == NULL) 180 uk = 1; 181 else 182 suberrname = suberr_fsm_names[subcode]; 183 break; 184 case ERR_RREFRESH: 185 if (subcode >= sizeof(suberr_rrefresh_names) / sizeof(char *) || 186 suberr_rrefresh_names[subcode] == NULL) 187 uk = 1; 188 else 189 suberrname = suberr_rrefresh_names[subcode]; 190 break; 191 default: 192 logit(LOG_ERR, "%s: %s notification, unknown errcode " 193 "%u, subcode %u", p, dir, errcode, subcode); 194 free(p); 195 return; 196 } 197 198 if (uk) 199 logit(LOG_ERR, "%s: %s notification: %s, unknown subcode %u", 200 p, dir, errnames[errcode], subcode); 201 else { 202 if (suberrname == NULL) 203 logit(LOG_ERR, "%s: %s notification: %s", p, 204 dir, errnames[errcode]); 205 else 206 logit(LOG_ERR, "%s: %s notification: %s, %s", 207 p, dir, errnames[errcode], suberrname); 208 } 209 free(p); 210 } 211 212 void 213 log_conn_attempt(const struct peer *peer, struct sockaddr *sa, socklen_t len) 214 { 215 char *p; 216 const char *b; 217 218 if (peer == NULL) { /* connection from non-peer, drop */ 219 b = log_sockaddr(sa, len); 220 logit(LOG_INFO, "connection from non-peer %s refused", b); 221 } else { 222 /* only log if there is a chance that the session may come up */ 223 if (peer->conf.down && peer->state == STATE_IDLE) 224 return; 225 p = log_fmt_peer(&peer->conf); 226 logit(LOG_INFO, "Connection attempt from %s while session is " 227 "in state %s", p, statenames[peer->state]); 228 free(p); 229 } 230 } 231