Annotation of src/usr.bin/bgplg/misc.c, Revision 1.1
1.1 ! reyk 1: /* $OpenBSD$ */
! 2:
! 3: /*
! 4: * Copyright (c) 2005, 2006 Reyk Floeter <reyk@vantronix.net>
! 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/stat.h>
! 20: #include <sys/types.h>
! 21: #include <sys/utsname.h>
! 22: #include <sys/wait.h>
! 23: #include <sys/time.h>
! 24:
! 25: #include <stdio.h>
! 26: #include <stdlib.h>
! 27: #include <signal.h>
! 28: #include <string.h>
! 29: #include <unistd.h>
! 30: #include <ctype.h>
! 31: #include <errno.h>
! 32: #include <fcntl.h>
! 33:
! 34: #include "bgplg.h"
! 35:
! 36: static volatile pid_t child = -1;
! 37:
! 38: int
! 39: lg_show_version(struct cmd *cmds, char **argv)
! 40: {
! 41: struct utsname uts;
! 42: if (uname(&uts) == 0)
! 43: printf("%s %s (%s)\n\n", uts.sysname, uts.release, uts.machine);
! 44: printf("%s - %s\n", NAME, BRIEF);
! 45: return (0);
! 46: }
! 47:
! 48: int
! 49: lg_checkperm(struct cmd *cmd)
! 50: {
! 51: struct stat stbuf;
! 52:
! 53: /* No external command to execute, this is always valid */
! 54: if (cmd->earg == NULL || cmd->earg[0] == NULL)
! 55: return (1);
! 56:
! 57: /*
! 58: * Skip commands if the executable is missing or
! 59: * the permission mode has been set to zero (the default
! 60: * in a CGI environment).
! 61: */
! 62: if (stat(cmd->earg[0], &stbuf) != 0 ||
! 63: (stbuf.st_mode & ~S_IFMT) == 0)
! 64: return (0);
! 65:
! 66: return (1);
! 67: }
! 68:
! 69: int
! 70: lg_help(struct cmd *cmds, char **argv)
! 71: {
! 72: u_int i;
! 73:
! 74: printf("valid commands:\n");
! 75: for (i = 0; cmds[i].name != NULL; i++) {
! 76: if (!lg_checkperm(&cmds[i]))
! 77: continue;
! 78:
! 79: printf(" %s", cmds[i].name);
! 80: if (cmds[i].minargs > 0)
! 81: printf(" { arg }");
! 82: else if (cmds[i].maxargs > 0)
! 83: printf(" [ arg ]");
! 84: printf("\n");
! 85: }
! 86: return (0);
! 87: }
! 88:
! 89: void
! 90: lg_sig_alarm(int sig)
! 91: {
! 92: if (child != -1) {
! 93: /* Forceibly kill the child, no excuse... */
! 94: kill(child, SIGKILL);
! 95: }
! 96: }
! 97:
! 98: int
! 99: lg_exec(const char *file, char **new_argv)
! 100: {
! 101: int status = 0, ret = 0;
! 102: sig_t save_quit, save_int, save_chld;
! 103: struct itimerval it;
! 104:
! 105: if (new_argv == NULL)
! 106: return (EFAULT);
! 107:
! 108: save_quit = signal(SIGQUIT, SIG_IGN);
! 109: save_int = signal(SIGINT, SIG_IGN);
! 110: save_chld = signal(SIGCHLD, SIG_DFL);
! 111:
! 112: switch (child = fork()) {
! 113: case -1:
! 114: ret = errno;
! 115: goto done;
! 116: case 0:
! 117: signal(SIGQUIT, SIG_DFL);
! 118: signal(SIGINT, SIG_DFL);
! 119: signal(SIGCHLD, SIG_DFL);
! 120:
! 121: execvp(file, new_argv);
! 122: _exit(127);
! 123: break;
! 124: default:
! 125: /* Kill the process after a timeout */
! 126: signal(SIGALRM, lg_sig_alarm);
! 127: bzero(&it, sizeof(it));
! 128: it.it_value.tv_sec = BGPLG_TIMEOUT;
! 129: setitimer(ITIMER_REAL, &it, NULL);
! 130:
! 131: waitpid(child, &status, 0);
! 132: break;
! 133: }
! 134:
! 135: switch (ret) {
! 136: case -1:
! 137: ret = ECHILD;
! 138: break;
! 139: default:
! 140: if (WIFEXITED(status))
! 141: ret = WEXITSTATUS(status);
! 142: else
! 143: ret = ECHILD;
! 144: }
! 145:
! 146: done:
! 147: /* Disable the process timeout timer */
! 148: bzero(&it, sizeof(it));
! 149: setitimer(ITIMER_REAL, &it, NULL);
! 150: child = -1;
! 151:
! 152: signal(SIGQUIT, save_quit);
! 153: signal(SIGINT, save_int);
! 154: signal(SIGCHLD, save_chld);
! 155: signal(SIGALRM, SIG_DFL);
! 156:
! 157: return (ret);
! 158: }
! 159:
! 160: ssize_t
! 161: lg_strip(char *str)
! 162: {
! 163: size_t len;
! 164:
! 165: if ((len = strlen(str)) < 1)
! 166: return (0); /* XXX EINVAL? */
! 167:
! 168: if (isspace(str[len - 1])) {
! 169: str[len - 1] = '\0';
! 170: return (lg_strip(str));
! 171: }
! 172:
! 173: return (strlen(str));
! 174: }
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