initial commit

nobotgate.c

@@ -0,0 +1,57 @@
+#define _XOPEN_SOURCE 700
+#include <libowfat/buffer.h>
+#include <libowfat/errmsg.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "nobotgate.h"
+
+#define dieusage() die(100,"usage: ",argv0," tokenfile allowed-handler denied-handler")
+
+static stralloc token;
+static char *tokenfile, *cmd_valid, *cmd_invalid;
+
+static void run(void) {
+  char tmp[] = PATH_TMP"/nobotgate.XXXXXX";
+  int tmpfd;
+  char buf[8192];
+  buffer b;
+  char *cmd;
+  tmpfd = mkstemp(tmp);
+
+  buffer_init_write(&b,tmpfd,buf,sizeof buf);
+  if (!send_headers(buffer_0, &b))
+    die(111,"copy stdin to temporary file");
+
+  lseek(tmpfd,0,SEEK_SET);
+  buffer_init_read(&b,tmpfd,buf,sizeof buf);
+  if (!parse_token(&b,&token)) {
+    carp("failed to parse token");
+    goto err;
+  }
+
+  cmd=check_token(tokenfile,&token)
+    ? cmd_valid
+    : cmd_invalid;
+  lseek(tmpfd,0,SEEK_SET);
+  dup2(tmpfd,0);
+  unlink(tmp);
+  buffer_close(&b);
+  stralloc_free(&token);
+  carp("execing ",cmd);
+  execlp(cmd,cmd,NULL);
+err:
+  unlink(tmp);
+  exit(111);
+}
+
+int main(int argc,char **argv)
+{
+  errmsg_iam(*argv);
+  argv++; argc--;
+  if (argc != 3) dieusage();
+  tokenfile=argv[0];
+  cmd_valid=argv[1];
+  cmd_invalid=argv[2];
+  run();
+}