Function exec_preprocessor

cfg_pp.c:631–814

}

static int exec_preprocessor(FILE *flat_cfg, const char *preproc_cmdline,
                             str *out)
{
	int parent_w[2], parent_r[2], cfgsz = 0, cfgbufsz = 0;
	char chunk[1024], *cfgbuf = NULL;
	ssize_t written, bytes;
	size_t bytes2write;
	char *p, *tok, *cmd, **argv = NULL, *pp_binary = NULL;
	int argv_len = 0, flags, have_input = 0, done_writing = 0;

	if (strlen(preproc_cmdline) == 0) {
		LM_ERR("preprocessor command (-p) is an empty string!\n");
		goto out_err;
	}

	if (pipe(parent_w) != 0 || pipe(parent_r) != 0) {
		LM_ERR("failed to create pipe: %d (%s)\n", errno, strerror(errno));
		goto out_err;
	}

	/* fork a data-hungry preprocessor beast! (a.k.a. some tiny sed) */
	if (fork() == 0) {
		close(parent_w[1]);
		if (dup2(parent_w[0], STDIN_FILENO) < 0) {
			LM_ERR("dup2 failed with: %d (%s)\n", errno, strerror(errno));
			exit(-1);
		}
		close(parent_w[0]);

		close(parent_r[0]);
		if (dup2(parent_r[1], STDOUT_FILENO) < 0) {
			LM_ERR("dup2 failed with: %d (%s)\n", errno, strerror(errno));
			exit(-1);
		}
		close(parent_w[1]);

		for (cmd = strdup(preproc_cmdline); ; cmd = NULL) {
			tok = strtok(cmd, " \t\r\n");
			if (!tok)
				break;

			if (!pp_binary)
				pp_binary = tok;

			argv = realloc(argv, (argv_len + 1) * sizeof *argv);
			argv[argv_len++] = tok;
		}

		argv = realloc(argv, (argv_len + 1) * sizeof *argv);
		argv[argv_len++] = NULL;

		if (pp_binary) {
			execvp(pp_binary, argv);
			LM_ERR("failed to exec preprocessor '%s': %d (%s)\n",
				   preproc_cmdline, errno, strerror(errno));
		} else
			LM_ERR("no binary to run: '%s'\n", preproc_cmdline);