mdw@git.distorted.org.uk Git - userv-utils/blob - www-cgi/ucgitarget.c~

   1 /*
   2  * Usage: as CGI script, but called by userv
   3  * environment variables are USERV_U_E_...
   4  */
   5
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <ctype.h>
   9 #include <unistd.h>
  10 #include <sys/types.h>
  11 #include <sys/wait.h>
  12 #include <stat.h>
  13
  14 #include "ucgi.h"
  15
  16 void *xrealloc(void *ptr, size_t sz) {
  17   void *r;
  18
  19   r= realloc(ptr,sz);
  20   if (!r) syserror("realloc failed");
  21   return r;
  22 }
  23
  24 int main(int argc, const char **argv) {
  25   char *uservar, *scriptpath;
  26   const char *nextslash, *lastslash, *pathi, *ev, *en, *scriptdir;
  27   const char *const *ep;
  28   const char **arguments;
  29   size_t scriptdirlen, scriptpathlen, l, uservarnl;
  30   struct stat stab;
  31
  32   ev= getenv("USERV_U_DEBUG");
  33   if (ev && *ev) debugmode= 1;
  34
  35   if (argc > MAX_ARGS) error("too many arguments");
  36
  37   scriptdir= *++argv;
  38   if (!scriptdir) error("no argv[1] (script directory)");
  39   scriptdirlen= strlen(scriptdir);
  40
  41   for (ep= envok; (en= *ep); ep++) {
  42     l= strlen(en)+11;
  43     if (uservarnl<l) { uservarn= xrealloc(uservarn,l); uservarnl= l; }
  44     sprintf(uservarn,"USERV_U_E_%s",en);
  45     ev= getenv(uservarn); if (!ev) continue;
  46     if (strlen(ev) > MAX_ENVVAR_VALUE) error("environment variable too long");
  47     if (setenv(en,ev,1)) syserror("setenv");
  48     if (unsetenv(uservarn)) syserror("unsetenv");
  49   }
  50
  51   pathi= getenv("PATH_INFO");
  52   if (!pathi) error("PATH_INFO not found");
  53   if (pathi[0] != '/') error("PATH_INFO must start with /");
  54   lastslash= pathi;
  55   for (;;) {
  56     nextslash= strchr(lastslash+1,'/');
  57     if (!nextslash) error("insufficient slashes in PATH_INFO beyond directory");
  58     if (nextslash[1]=='.' || nextslash[1]=='#' || !nextslash[1]) error("bad char begin");
  59     if (nextslash-pathi > MAX_SCRIPTPATH_LEN) error("PATH_INFO script dir too long");
  60     scriptpathlen= scriptdirlen+(nextslash-pathi);
  61     scriptpath= xrealloc(scriptpath,scriptpathlen);
  62     memcpy(scriptpath,pathi,scriptpathlen); scriptpath[scriptpathlen]= 0;
  63     if (scriptpath[scriptpathlen-1]=='~') error("bad char end");
  64     r= stat(scriptpath,&stab); if (r) syserror("stat script");
  65     if (S_ISREG(stab.st_mode)) break;
  66     if (!S_ISDIR(stab.st_mode)) syserror("script not directory or file");
  67     lastlash= nextslash;
  68   }
  69   if (setenv("PATH_INFO",nextslash,1)) syserror("setenv PATH_INFO");
  70
  71   arguments= xmalloc(sizeof(const char*)*(argc+5));
  72   nargs= 0;
  73
  74   arguments[nargs++]= scriptpath;
  75   while ((av= (*++argv))) arguments[nargs++]= av;
  76   arguments[nargs++]= 0;
  77
  78   execvp(scriptpath,(char*const*)arguments);
  79   syserror("exec script");
  80   return -1;
  81 }