ucgi/: Return useful status codes when things go wrong.

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

diff --git a/www-cgi/ucgi.c b/www-cgi/ucgi.c
index c4c072d8c6a2dce15c291038b542ed529338c253..845eb444b891b9ff3e8ade47350d8161704b57f4 100644 (file)
--- a/www-cgi/ucgi.c
+++ b/www-cgi/ucgi.c
@@ -30,13 +30,34 @@
 
 #include "ucgi.h"
 
+static const char *const default_envok[] = {
+  "AUTH_TYPE",
+  "CONTENT_TYPE",
+  "CONTENT_LENGTH",
+  "DOCUMENT_ROOT",
+  "GATEWAY_INTERFACE",
+  "HTTP_*",
+  "HTTPS",
+  "PATH_INFO",
+  "PATH_TRANSLATED",
+  "QUERY_STRING",
+  "REDIRECT_*",
+  "REMOTE_*",
+  "REQUEST_METHOD",
+  "REQUEST_URI",
+  "SCRIPT_*",
+  "SERVER_*",
+  "SSL_*",
+  0
+};
+
 struct buildargs {
   const char **v;
   int n, max;
 };
 
 static void addarg(struct buildargs *args, const char *a) {
-  if (args->n > args->max) error("too many arguments");
+  if (args->n > args->max) error("too many arguments", 500);
   args->v[args->n++]= a;
 }
 
@@ -46,7 +67,8 @@ static void add_userv_var(const char *fulln,
   size_t l;
   char *a;
 
-  l= strlen(ev); if (l > MAX_ENVVAR_VALUE) error("environment variable too long");
+  l= strlen(ev);
+  if (l > MAX_ENVVAR_VALUE) error("environment variable too long", 500);
   a= xmalloc(strlen(en)+l+6);
   sprintf(a,"-DE_%s=%s",en,ev);
   addarg(args, a);
@@ -54,7 +76,8 @@ static void add_userv_var(const char *fulln,
 
 int main(int argc, const char **argv) {
   char *username;
-  const char *slash2, *pathi, *av;
+  const char *slash2, *pathi, *ev, *av;
+  const char *const *envok = 0;
   size_t usernamelen, l;
   struct buildargs args;
   pid_t child, rchild;
@@ -70,24 +93,33 @@ int main(int argc, const char **argv) {
     D( printf(";;; UCGI\n"); )
   }
   
-  if (argc > MAX_ARGS) error("too many arguments");
+  if (argc > MAX_ARGS) error("too many arguments", 500);
+
+  ev= getenv("UCGI_ENV_FILTER");
+  if (ev)
+    envok= load_filters(LOADF_MUST, ev, LF_END);
+  else
+    envok= load_filters(0, "/etc/userv/ucgi.env-filter", LF_END);
 
   pathi= getenv("PATH_INFO");
-  if (!pathi) error("PATH_INFO not found");
+  if (!pathi) error("PATH_INFO not found", 500);
   D( if (debugmode) {
        printf(";; find user name...\n"
              ";;   initial PATH_INFO = `%s'\n",
              pathi);
   } )
-  if (pathi[0] != '/' || pathi[1] != '~') error("PATH_INFO must start with /~");
-  slash2= strchr(pathi+2,'/'); if (!slash2) error("PATH_INFO must have more than one /");
+  if (pathi[0] != '/' || pathi[1] != '~')
+    error("PATH_INFO must start with /~", 400);
+  slash2= strchr(pathi+2,'/');
+  if (!slash2) error("PATH_INFO must have more than one /", 400);
   usernamelen= slash2-(pathi+2);
-  if (usernamelen > MAX_USERNAME_LEN) error("PATH_INFO username too long");
+  if (usernamelen > MAX_USERNAME_LEN) error("PATH_INFO username too long", 400);
   username= xmalloc(usernamelen+1);
   memcpy(username,pathi+2,usernamelen); username[usernamelen]= 0;
   D( if (debugmode)
        printf(";;   user = `%s'; tail = `%s'\n", username, slash2); )
-  if (!isalpha(username[0])) error("username 1st character is not alphabetic");
+  if (!isalpha(username[0]))
+    error("username 1st character is not alphabetic", 400);
   xsetenv("PATH_INFO",slash2,1);
 
   args.n= 0; args.max= argc + MAX_ENVVARS + 10;
@@ -96,7 +128,8 @@ int main(int argc, const char **argv) {
   addarg(&args, "userv");
   if (debugmode) addarg(&args, "-DDEBUG=1");
 
-  filter_environment(FILTF_WILDCARD, "", envok, add_userv_var, &args);
+  filter_environment(FILTF_WILDCARD, "", envok, default_envok,
+                    add_userv_var, &args);
 
   addarg(&args, username);
   addarg(&args, "www-cgi");