1 /*- 2 * Copyright (c) 2016 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 6 * under sponsorship from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/procctl.h> 34 #include <err.h> 35 #include <stdbool.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 enum { 42 MODE_INVALID, 43 MODE_TRACE, 44 MODE_TRAPCAP, 45 }; 46 47 static pid_t 48 str2pid(const char *str) 49 { 50 pid_t res; 51 char *tail; 52 53 res = strtol(str, &tail, 0); 54 if (*tail != '\0') { 55 warnx("non-numeric pid"); 56 return (-1); 57 } 58 return (res); 59 } 60 61 static void __dead2 62 usage(void) 63 { 64 65 fprintf(stderr, "Usage: proccontrol -m (trace|trapcap) [-q] " 66 "[-s (enable|disable)] [-p pid | command]\n"); 67 exit(1); 68 } 69 70 int 71 main(int argc, char *argv[]) 72 { 73 int arg, ch, error, mode; 74 pid_t pid; 75 bool enable, do_command, query; 76 77 mode = MODE_INVALID; 78 enable = true; 79 pid = -1; 80 query = false; 81 while ((ch = getopt(argc, argv, "m:qs:p:")) != -1) { 82 switch (ch) { 83 case 'm': 84 if (strcmp(optarg, "trace") == 0) 85 mode = MODE_TRACE; 86 else if (strcmp(optarg, "trapcap") == 0) 87 mode = MODE_TRAPCAP; 88 else 89 usage(); 90 break; 91 case 's': 92 if (strcmp(optarg, "enable") == 0) 93 enable = true; 94 else if (strcmp(optarg, "disable") == 0) 95 enable = false; 96 else 97 usage(); 98 break; 99 case 'p': 100 pid = str2pid(optarg); 101 break; 102 case 'q': 103 query = true; 104 break; 105 case '?': 106 default: 107 usage(); 108 break; 109 } 110 } 111 argc -= optind; 112 argv += optind; 113 do_command = argc != 0; 114 if (do_command) { 115 if (pid != -1 || query) 116 usage(); 117 pid = getpid(); 118 } else if (pid == -1) { 119 pid = getpid(); 120 } 121 122 if (query) { 123 switch (mode) { 124 case MODE_TRACE: 125 error = procctl(P_PID, pid, PROC_TRACE_STATUS, &arg); 126 break; 127 case MODE_TRAPCAP: 128 error = procctl(P_PID, pid, PROC_TRAPCAP_STATUS, &arg); 129 break; 130 default: 131 usage(); 132 break; 133 } 134 if (error != 0) 135 err(1, "procctl status"); 136 switch (mode) { 137 case MODE_TRACE: 138 if (arg == -1) 139 printf("disabled\n"); 140 else if (arg == 0) 141 printf("enabled, no debugger\n"); 142 else 143 printf("enabled, traced by %d\n", arg); 144 break; 145 case MODE_TRAPCAP: 146 switch (arg) { 147 case PROC_TRAPCAP_CTL_ENABLE: 148 printf("enabled\n"); 149 break; 150 case PROC_TRAPCAP_CTL_DISABLE: 151 printf("disabled\n"); 152 break; 153 } 154 break; 155 } 156 } else { 157 switch (mode) { 158 case MODE_TRACE: 159 arg = enable ? PROC_TRACE_CTL_ENABLE : 160 PROC_TRACE_CTL_DISABLE; 161 error = procctl(P_PID, pid, PROC_TRACE_CTL, &arg); 162 break; 163 case MODE_TRAPCAP: 164 arg = enable ? PROC_TRAPCAP_CTL_ENABLE : 165 PROC_TRAPCAP_CTL_DISABLE; 166 error = procctl(P_PID, pid, PROC_TRAPCAP_CTL, &arg); 167 break; 168 default: 169 usage(); 170 break; 171 } 172 if (error != 0) 173 err(1, "procctl ctl"); 174 if (do_command) { 175 error = execvp(argv[0], argv); 176 err(1, "exec"); 177 } 178 } 179 exit(0); 180 } 181