Found in davenant:/usr/local/src/misc

[userv-utils.git] / www-cgi / ucgitarget.c

diff --git a/www-cgi/ucgitarget.c b/www-cgi/ucgitarget.c
new file mode 100644 (file)
index 0000000..795d804
--- /dev/null
+++ b/www-cgi/ucgitarget.c
@@ -0,0 +1,108 @@
+/*
+ * Usage: as CGI script, but called by userv
+ * environment variables are USERV_U_E_...
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+
+#include "ucgi.h"
+
+static void *xrealloc(void *ptr, size_t sz) {
+  void *r;
+
+  r= realloc(ptr,sz);
+  if (!r) syserror("realloc failed");
+  return r;
+}
+
+int main(int argc, const char **argv) {
+  char *uservarn, *scriptpath, *newvar;
+  const char *nextslash, *lastslash, *pathi, *ev, *ev2, *en, *scriptdir, *av;
+  const char *const *ep;
+  const char **arguments;
+  size_t scriptdirlen, scriptpathlen, l, uservarnl;
+  struct stat stab;
+  int r, nargs;
+
+  ev= getenv("USERV_U_DEBUG");
+  if (ev && *ev) debugmode= 1;
+  
+  if (argc > MAX_ARGS) error("too many arguments");
+
+  if (!*++argv) error("no script directory argument");
+  ev= getenv("HOME"); if (!ev) error("no HOME env. var");
+  l= strlen(*argv)+strlen(ev);
+  newvar= xmalloc(l+2);
+  sprintf(newvar,"%s/%s",ev,*argv);
+  scriptdir= newvar;
+  scriptdirlen= strlen(scriptdir);
+
+  uservarn= 0;
+  uservarnl= 0;
+  for (ep= envok; (en= *ep); ep++) {
+    l= strlen(en)+11;
+    if (uservarnl<l) { uservarn= xrealloc(uservarn,l); uservarnl= l; }
+    sprintf(uservarn,"USERV_U_E_%s",en);
+    ev= getenv(uservarn); if (!ev) continue;
+    if (strlen(ev) > MAX_ENVVAR_VALUE) error("environment variable too long");
+    if (setenv(en,ev,1)) syserror("setenv");
+    unsetenv(uservarn);
+  }
+
+  scriptpath= 0;
+  pathi= getenv("PATH_INFO");
+  if (!pathi) error("PATH_INFO not found");
+  lastslash= pathi;
+  for (;;) {
+    if (*lastslash != '/') error("PATH_INFO expected slash not found");
+    if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1]) error("bad char begin");
+    nextslash= strchr(lastslash+1,'/');
+    if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1);
+    if (!nextslash) error("insufficient elements in PATH_INFO");
+    if (nextslash==lastslash+1) error("empty component in PATH_INFO");
+    if (nextslash-pathi > MAX_SCRIPTPATH_LEN) error("PATH_INFO script path too long");
+    scriptpathlen= scriptdirlen+(nextslash-pathi);
+    scriptpath= xrealloc(scriptpath,scriptpathlen+1);
+    strcpy(scriptpath,scriptdir);
+    memcpy(scriptpath+scriptdirlen,pathi,nextslash-pathi);
+    scriptpath[scriptpathlen]= 0;
+    if (scriptpath[scriptpathlen-1]=='~') error("bad char end");
+    r= stat(scriptpath,&stab); if (r) syserror("stat script");
+    if (S_ISREG(stab.st_mode)) break;
+    if (!S_ISDIR(stab.st_mode)) syserror("script not directory or file");
+    lastslash= nextslash;
+  }
+  if (*nextslash) xsetenv("PATH_INFO",nextslash,1);
+  else unsetenv("PATH_INFO");
+
+  newvar= xmalloc(scriptpathlen+strlen(nextslash)+3);
+  sprintf(newvar,"%s%s",scriptpath,nextslash);
+  xsetenv("PATH_TRANSLATED",newvar,1);
+
+  xsetenv("SCRIPT_FILENAME",scriptpath,1);
+
+  ev= getenv("SCRIPT_NAME");
+  if (ev) {
+    ev2= getenv("USER"); if (!ev2) error("no USER variable");
+    newvar= xmalloc(strlen(ev)+2+strlen(ev2)+scriptpathlen-scriptdirlen+2);
+    sprintf(newvar,"%s/~%s%s",ev,ev2,scriptpath+scriptdirlen);
+    xsetenv("SCRIPT_NAME",newvar,1);
+  }
+
+  arguments= xmalloc(sizeof(const char*)*(argc+5));
+  nargs= 0;
+  
+  arguments[nargs++]= scriptpath;
+  while ((av= (*++argv))) arguments[nargs++]= av;
+  arguments[nargs++]= 0;
+
+  execvp(scriptpath,(char*const*)arguments);
+  syserror("exec script");
+  return -1;
+}