+/*
+ * 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;
+}