1 /* $OpenBSD: client.c,v 1.10 2018/07/13 08:39:33 krw Exp $ */ 2 3 /* Copyright 1988,1990,1993,1994 by Paul Vixie 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (c) 1997,2000 by Internet Software Consortium, Inc. 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 #include <sys/socket.h> 22 #include <sys/stat.h> 23 #include <sys/un.h> 24 25 #include <bitstring.h> /* for structs.h */ 26 #include <err.h> 27 #include <errno.h> 28 #include <stdio.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <time.h> /* for structs.h */ 32 #include <unistd.h> 33 34 #include "pathnames.h" 35 #include "macros.h" 36 #include "structs.h" 37 #include "funcs.h" 38 #include "globals.h" 39 40 /* int in_file(const char *string, FILE *file, int error) 41 * return TRUE if one of the lines in file matches string exactly, 42 * FALSE if no lines match, and error on error. 43 */ 44 static int 45 in_file(const char *string, FILE *file, int error) 46 { 47 char line[MAX_TEMPSTR]; 48 char *endp; 49 50 if (fseek(file, 0L, SEEK_SET)) 51 return (error); 52 while (fgets(line, MAX_TEMPSTR, file)) { 53 if (line[0] != '\0') { 54 endp = &line[strlen(line) - 1]; 55 if (*endp != '\n') 56 return (error); 57 *endp = '\0'; 58 if (0 == strcmp(line, string)) 59 return (TRUE); 60 } 61 } 62 if (ferror(file)) 63 return (error); 64 return (FALSE); 65 } 66 67 /* int allowed(const char *username, const char *allow_file, const char *deny_file) 68 * returns TRUE if (allow_file exists and user is listed) 69 * or (deny_file exists and user is NOT listed). 70 * root is always allowed. 71 */ 72 int 73 allowed(const char *username, const char *allow_file, const char *deny_file) 74 { 75 FILE *fp; 76 int isallowed; 77 78 if (strcmp(username, "root") == 0) 79 return (TRUE); 80 isallowed = FALSE; 81 if ((fp = fopen(allow_file, "r")) != NULL) { 82 isallowed = in_file(username, fp, FALSE); 83 fclose(fp); 84 } else if ((fp = fopen(deny_file, "r")) != NULL) { 85 isallowed = !in_file(username, fp, FALSE); 86 fclose(fp); 87 } 88 return (isallowed); 89 } 90 91 /* void poke_daemon(unsigned char cookie) 92 * touches spool_dir and sends a poke to the cron daemon if running. 93 */ 94 void 95 poke_daemon(unsigned char cookie) 96 { 97 int sock = -1; 98 const char *cronsock = _PATH_CRON_SOCK; 99 struct sockaddr_un s_un; 100 101 bzero(&s_un, sizeof(s_un)); 102 if (strlcpy(s_un.sun_path, cronsock, sizeof(s_un.sun_path)) >= 103 sizeof(s_un.sun_path)) { 104 warnc(ENAMETOOLONG, "%s", cronsock); 105 return; 106 } 107 s_un.sun_family = AF_UNIX; 108 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 && 109 connect(sock, (struct sockaddr *)&s_un, sizeof(s_un)) == 0) 110 send(sock, &cookie, 1, MSG_NOSIGNAL); 111 else 112 warnx("warning, cron does not appear to be running"); 113 if (sock >= 0) 114 close(sock); 115 } 116