finalise 2.0.0

[authbind.git] / authbind.c

diff --git a/authbind.c b/authbind.c
index 6d957aeba5df4cb9d4d8dc1532eb6d544d9ca1db..484f0e74f332f1d9a87a33eed7386832934724d1 100644 (file)
--- a/authbind.c
+++ b/authbind.c
@@ -1,28 +1,80 @@
-/**/
+/*
+ *  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>
 
-#define LD_PRELOAD "LD_PRELOAD"
-#define AUTHBINDLIB "AUTHBIND_LIB"
-#define LIBAUTHBIND "/usr/lib/authbind/libauthbind.so.0"
+#include "authbind.h"
+
+static void printusage(FILE *f) {
+  if (fprintf(f,
+             "usage:       authbind [<options>] <program> <arg> <arg> ...\n"
+             "options:     --deep    --depth <levels>\n"
+             "version:     " MAJOR_VER "." MINOR_VER "\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;
+  char *newpreload, *ep;
+  char buf[50];
+  unsigned long depth;
 
-  authbindlib= getenv(AUTHBINDLIB);
-  if (!authbindlib) {
-    if (setenv(AUTHBINDLIB,LIBAUTHBIND,0)) {
-      perror("authbind: setenv " AUTHBINDLIB);
-      exit(-1);
+  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(LD_PRELOAD))) {
+  if ((expreload= getenv(PRELOAD_VAR))) {
     newpreload= malloc(strlen(expreload)+strlen(authbindlib)+2);
     strcpy(newpreload,expreload);
     strcat(newpreload,":");
@@ -31,7 +83,16 @@ int main(int argc, char *const *argv) {
   } else {
     preload= authbindlib;
   }
-  if (setenv(LD_PRELOAD,preload,1)) { perror("authbind: setenv"); exit(-1); }
+  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);