1 /* $OpenBSD: syslogc.c,v 1.5 2004/04/13 01:10:05 djm Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Damien Miller 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 <sys/types.h> 20 #include <sys/socket.h> 21 #include <sys/un.h> 22 23 #include <err.h> 24 #include <errno.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <string.h> 28 #include <unistd.h> 29 30 #define DEFAULT_CTLSOCK "/var/run/syslogd.sock" 31 32 #define MAX_MEMBUF_NAME 64 /* Max length of membuf log name */ 33 34 struct ctl_cmd { 35 #define CMD_READ 1 /* Read out log */ 36 #define CMD_READ_CLEAR 2 /* Read and clear log */ 37 #define CMD_CLEAR 3 /* Clear log */ 38 #define CMD_LIST 4 /* List available logs */ 39 int cmd; 40 char logname[MAX_MEMBUF_NAME]; 41 }; 42 43 static void 44 usage(void) 45 { 46 extern char *__progname; 47 48 fprintf(stderr, "Usage: %s [-Ccq] [-s ctlsock] logname\n", __progname); 49 exit(1); 50 } 51 52 int 53 main(int argc, char **argv) 54 { 55 const char *ctlsock_path; 56 char buf[8192]; 57 struct sockaddr_un ctl; 58 socklen_t ctllen; 59 int ctlsock, ch; 60 FILE *ctlf; 61 extern char *optarg; 62 extern int optind; 63 struct ctl_cmd cc; 64 65 memset(&cc, '\0', sizeof(cc)); 66 67 ctlsock_path = DEFAULT_CTLSOCK; 68 while ((ch = getopt(argc, argv, "Cchqs:")) != -1) { 69 switch (ch) { 70 case 'C': 71 cc.cmd = CMD_CLEAR; 72 break; 73 case 'c': 74 cc.cmd = CMD_READ_CLEAR; 75 break; 76 case 'h': 77 usage(); 78 break; 79 case 'q': 80 cc.cmd = CMD_LIST; 81 break; 82 case 's': 83 ctlsock_path = optarg; 84 break; 85 default: 86 fprintf(stderr, "Invalid commandline option.\n"); 87 usage(); 88 break; 89 } 90 } 91 92 if (cc.cmd == 0) 93 cc.cmd = CMD_READ; 94 95 if ((cc.cmd != CMD_LIST && optind != argc - 1) || 96 (cc.cmd == CMD_LIST && optind != argc)) 97 usage(); 98 99 if (cc.cmd != CMD_LIST) { 100 if (strlcpy(cc.logname, argv[optind], sizeof(cc.logname)) >= 101 sizeof(cc.logname)) 102 errx(1, "Specified log name is too long"); 103 } 104 105 memset(&ctl, '\0', sizeof(ctl)); 106 strlcpy(ctl.sun_path, ctlsock_path, sizeof(ctl.sun_path)); 107 ctl.sun_family = AF_UNIX; 108 109 if ((ctlsock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 110 err(1, "socket"); 111 if (connect(ctlsock, (struct sockaddr*)&ctl, sizeof(ctl)) == -1) 112 err(1, "connect: %s", ctl.sun_path); 113 if ((ctlf = fdopen(ctlsock, "r+")) == NULL) 114 err(1, "fdopen"); 115 /* Send command */ 116 if (fwrite(&cc, sizeof(cc), 1, ctlf) != 1) 117 err(1, "fwrite"); 118 119 fflush(ctlf); 120 setlinebuf(ctlf); 121 122 /* Write out reply */ 123 while((fgets(buf, sizeof(buf), ctlf)) != NULL) 124 fputs(buf, stdout); 125 126 fclose(ctlf); 127 close(ctlsock); 128 129 exit(0); 130 } 131