usr.sbin/altq/altqd/altqd.c

   1 /*      $NetBSD: altqd.c,v 1.8 2005/06/17 12:02:00 peter Exp $  */
   2 /*      $KAME: altqd.c,v 1.10 2002/02/20 10:42:26 kjc Exp $     */
   3 /*
   4  * Copyright (c) 2001 Theo de Raadt
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  *
  27  * Copyright (C) 1997-2002
  28  *      Sony Computer Science Laboratories, Inc.  All rights reserved.
  29  *
  30  * Redistribution and use in source and binary forms, with or without
  31  * modification, are permitted provided that the following conditions
  32  * are met:
  33  * 1. Redistributions of source code must retain the above copyright
  34  *    notice, this list of conditions and the following disclaimer.
  35  * 2. Redistributions in binary form must reproduce the above copyright
  36  *    notice, this list of conditions and the following disclaimer in the
  37  *    documentation and/or other materials provided with the distribution.
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
  40  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  42  * ARE DISCLAIMED.  IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
  43  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  44  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  45  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  47  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  48  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  49  * SUCH DAMAGE.
  50  */
  51
  52 #include <sys/param.h>
  53 #include <sys/socket.h>
  54 #include <sys/un.h>
  55 #include <sys/stat.h>
  56 #include <net/if.h>
  57
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <unistd.h>
  61 #include <string.h>
  62 #include <errno.h>
  63 #include <signal.h>
  64 #include <fcntl.h>
  65 #include <syslog.h>
  66 #include <err.h>
  67 #ifndef __FreeBSD__
  68 #include <util.h>
  69 #endif
  70
  71 #include <altq/altq.h>
  72 #include "altq_qop.h"
  73 #include "quip_server.h"
  74
  75 #ifdef __FreeBSD__
  76 #define  ALTQD_PID_FILE         "/var/run/altqd.pid"
  77 #endif
  78 #define MAX_CLIENT              10
  79
  80 static volatile sig_atomic_t gotsig_hup, gotsig_int, gotsig_term;
  81
  82 static void usage(void);
  83 static void sig_handler(int);
  84
  85 static void
  86 usage(void)
  87 {
  88         fprintf(stderr, "usage: %s [-dv] [-f config]\n", getprogname());
  89         exit(1);
  90 }
  91
  92 static void
  93 sig_handler(int sig)
  94 {
  95         switch (sig) {
  96         case SIGHUP:
  97                 gotsig_hup = 1;
  98                 break;
  99         case SIGINT:
 100                 gotsig_int = 1;
 101                 break;
 102         case SIGTERM:
 103                 gotsig_term = 1;
 104                 break;
 105         case SIGPIPE:
 106                 /*
 107                  * we have lost an API connection.
 108                  * a subsequent output operation will catch EPIPE.
 109                  */
 110                 break;
 111         }
 112 }
 113
 114 int
 115 main(int argc, char **argv)
 116 {
 117         int     i, c, maxfd, rval, qpsock;
 118         fd_set  fds, rfds;
 119         FILE    *fp, *client[MAX_CLIENT];
 120
 121         m_debug = 0;
 122         l_debug = LOG_INFO;
 123         fp = NULL;
 124         for (i = 0; i < MAX_CLIENT; i++)
 125                 client[i] = NULL;
 126
 127         while ((c = getopt(argc, argv, "f:vdl:")) != -1) {
 128                 switch (c) {
 129                 case 'f':
 130                         altqconfigfile = optarg;
 131                         break;
 132                 case 'v':
 133                         l_debug = LOG_DEBUG;
 134                         m_debug |= DEBUG_ALTQ;
 135                         daemonize = 0;
 136                         break;
 137                 case 'd':
 138                         daemonize = 0;
 139                         break;
 140                 case 'l':
 141                         l_debug = atoi(optarg);
 142                         break;
 143                 default:
 144                         usage();
 145                 }
 146         }
 147
 148         signal(SIGINT, sig_handler);
 149         signal(SIGTERM, sig_handler);
 150         signal(SIGHUP, sig_handler);
 151         signal(SIGPIPE, sig_handler);
 152
 153         if (daemonize)
 154                 openlog("altqd", LOG_PID, LOG_DAEMON);
 155
 156         if (qcmd_init() != 0) {
 157                 if (daemonize)
 158                         closelog();
 159                 exit(1);
 160         }
 161
 162         /*
 163          * open a unix domain socket for altqd clients
 164          */
 165         if ((qpsock = socket(AF_LOCAL, SOCK_STREAM, 0)) < 0)
 166                 LOG(LOG_ERR, errno, "can't open unix domain socket");
 167         else {
 168                 struct sockaddr_un addr;
 169
 170                 bzero(&addr, sizeof(addr));
 171                 addr.sun_family = AF_LOCAL;
 172                 strlcpy(addr.sun_path, QUIP_PATH, sizeof(addr.sun_path));
 173                 unlink(QUIP_PATH);
 174                 if (bind(qpsock, (struct sockaddr *)&addr,
 175                     sizeof(addr)) < 0) {
 176                         LOG(LOG_ERR, errno, "can't bind to %s", QUIP_PATH);
 177                         close(qpsock);
 178                         qpsock = -1;
 179                 }
 180                 chmod(QUIP_PATH, 0666);
 181                 if (listen(qpsock, SOMAXCONN) < 0) {
 182                         LOG(LOG_ERR, errno, "can't listen to %s", QUIP_PATH);
 183                         close(qpsock);
 184                         qpsock = -1;
 185                 }
 186         }
 187
 188         if (daemonize) {
 189                 daemon(0, 0);
 190
 191                 /* save pid to the pid file (/var/tmp/altqd.pid) */
 192 #ifdef __FreeBSD__
 193                 {
 194                         FILE *fp;
 195
 196                         if ((fp = fopen(ALTQD_PID_FILE, "w")) != NULL) {
 197                                 fprintf(fp, "%d\n", getpid());
 198                                 fclose(fp);
 199                         } else
 200                                 LOG(LOG_WARNING, errno, "can't open pid file");
 201                 }
 202 #else
 203                 pidfile(NULL);
 204 #endif
 205         } else {
 206                 /* interactive mode */
 207                 fp = stdin;
 208                 printf("\nEnter ? or command:\n");
 209                 printf("altqd %s> ", cur_ifname());
 210                 fflush(stdout);
 211         }
 212
 213         /*
 214          * go into the command mode.
 215          */
 216         FD_ZERO(&fds);
 217         maxfd = 0;
 218         if (fp != NULL) {
 219                 FD_SET(fileno(fp), &fds);
 220                 maxfd = MAX(maxfd, fileno(fp) + 1);
 221         }
 222         if (qpsock >= 0) {
 223                 FD_SET(qpsock, &fds);
 224                 maxfd = MAX(maxfd, qpsock + 1);
 225         }
 226
 227         rval = 1;
 228         while (rval) {
 229                 if (gotsig_hup) {
 230                         qcmd_destroyall();
 231                         gotsig_hup = 0;
 232                         LOG(LOG_INFO, 0, "reinitializing altqd...");
 233                         if (qcmd_init() != 0) {
 234                                 LOG(LOG_INFO, 0, "reinitialization failed");
 235                                 break;
 236                         }
 237                 }
 238                 if (gotsig_term || gotsig_int) {
 239                         LOG(LOG_INFO, 0, "Exiting on signal %d",
 240                             gotsig_term ? SIGTERM : SIGINT);
 241                         break;
 242                 }
 243
 244                 FD_COPY(&fds, &rfds);
 245                 if (select(maxfd, &rfds, NULL, NULL, NULL) < 0) {
 246                         if (errno != EINTR)
 247                                 err(1, "select");
 248                         continue;
 249                 }
 250
 251                 /*
 252                  * if there is command input, read the input line,
 253                  * parse it, and execute.
 254                  */
 255                 if (fp && FD_ISSET(fileno(fp), &rfds)) {
 256                         rval = do_command(fp);
 257                         if (rval == 0) {
 258                                 /* quit command or eof on input */
 259                                 LOG(LOG_INFO, 0, "Exiting.");
 260                         } else if (fp == stdin)
 261                                 printf("altqd %s> ", cur_ifname());
 262                         fflush(stdout);
 263                 } else if (qpsock >= 0 && FD_ISSET(qpsock, &rfds)) {
 264                         /*
 265                          * quip connection request from client via unix
 266                          * domain socket; get a new socket for this
 267                          * connection and add it to the select list.
 268                          */
 269                         int newsock = accept(qpsock, NULL, NULL);
 270
 271                         if (newsock == -1) {
 272                                 LOG(LOG_ERR, errno, "accept");
 273                                 continue;
 274                         }
 275                         FD_SET(newsock, &fds);
 276                         for (i = 0; i < MAX_CLIENT; i++)
 277                                 if (client[i] == NULL) {
 278                                         client[i] = fdopen(newsock, "r+");
 279                                         break;
 280                                 }
 281                         maxfd = MAX(maxfd, newsock + 1);
 282                 } else {
 283                         /*
 284                          * check input from a client via unix domain socket
 285                          */
 286                         for (i = 0; i < MAX_CLIENT; i++) {
 287                                 int fd;
 288
 289                                 if (client[i] == NULL)
 290                                         continue;
 291                                 fd = fileno(client[i]);
 292                                 if (FD_ISSET(fd, &rfds)) {
 293                                         if (quip_input(client[i]) != 0 ||
 294                                             fflush(client[i]) != 0) {
 295                                                 /* connection closed */
 296                                                 fclose(client[i]);
 297                                                 client[i] = NULL;
 298                                                 FD_CLR(fd, &fds);
 299                                         }
 300                                 }
 301                         }
 302                 }
 303         }
 304
 305         /* cleanup and exit */
 306         qcmd_destroyall();
 307         if (qpsock >= 0)
 308                 (void)close(qpsock);
 309         unlink(QUIP_PATH);
 310
 311         for (i = 0; i < MAX_CLIENT; i++)
 312                 if (client[i] != NULL)
 313                         (void)fclose(client[i]);
 314         if (daemonize) {
 315 #ifdef __FreeBSD__
 316                 /* if we have a pid file, remove it */
 317                 unlink(ALTQD_PID_FILE);
 318 #endif
 319                 closelog();
 320         }
 321         exit(0);
 322 }