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/*
* authbind.c - main invoker program
*
* authbind is Copyright (C) 1998 Ian Jackson
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>
#include "authbind.h"
static void printusage(FILE *f) {
if (fprintf(f,
"usage: authbind [<options>] <program> <arg> <arg> ...\n"
"options: --deep --depth <levels>\n")
== EOF) { perror("printf usage"); exit(-1); }
}
static void usageerror(const char *msg) {
fprintf(stderr,"usage error: %s\n",msg);
printusage(stderr);
exit(-1);
}
static void mustsetenv(const char *var, const char *val) {
if (setenv(var,val,1)) { perror("authbind: setenv"); exit(-1); }
}
int main(int argc, char *const *argv) {
const char *expreload, *authbindlib, *preload;
char *newpreload, *ep;
char buf[50];
unsigned long depth;
depth= 1;
while (argc>1 && argv[1][0]=='-') {
argc--; argv++;
if (!argv[0][1]) break;
if (!strcmp("--deep",argv[0])) { depth= 0; }
else if (!strcmp("--depth",argv[0])) {
if (argc<=1) usageerror("--depth requires a value");
argc--; argv++;
depth= strtoul(argv[0],&ep,10);
if (*ep || depth<=0 || depth>100) usageerror("--depth value is not valid");
} else if (!strcmp("--help",argv[0]) || !strcmp("--help",argv[0])) {
printusage(stdout);
exit(0);
}
}
if (argc<2) usageerror("need program name");
authbindlib= getenv(AUTHBINDLIB_VAR);
if (!authbindlib) {
authbindlib= LIBAUTHBIND;
mustsetenv(AUTHBINDLIB_VAR,authbindlib);
}
if ((expreload= getenv(PRELOAD_VAR))) {
newpreload= malloc(strlen(expreload)+strlen(authbindlib)+2);
strcpy(newpreload,expreload);
strcat(newpreload,":");
strcat(newpreload,authbindlib);
preload= newpreload;
} else {
preload= authbindlib;
}
mustsetenv(PRELOAD_VAR,preload);
if (depth > 1) {
sprintf(buf,"%ld",depth-1);
mustsetenv(AUTHBIND_LEVELS_VAR,buf);
} else if (depth == 0) {
mustsetenv(AUTHBIND_LEVELS_VAR,"y");
} else {
assert(depth==1);
}
execvp(argv[1],argv+1);
perror(argv[1]); exit(-1);
}
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