--- /dev/null
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* lib/krb5/krb/parse_host_string.c - Parse host strings into host and port */
+/*
+ * Copyright (C) 2016 by the Massachusetts Institute of Technology.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "k5-int.h"
+#include <ctype.h>
+
+/* Return true if s is composed solely of digits. */
+static krb5_boolean
+is_string_numeric(const char *s)
+{
+ if (*s == '\0')
+ return FALSE;
+
+ for (; *s != '\0'; s++) {
+ if (!isdigit(*s))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*
+ * Parse a string containing a host specifier. The expected format for the
+ * string is:
+ *
+ * host[:port] or port
+ *
+ * host and port are optional, though one must be present. host may have
+ * brackets around it for IPv6 addresses.
+ *
+ * Arguments:
+ * address - The address string that should be parsed.
+ * default_port - The default port to use if no port is found.
+ * host_out - An output pointer for the parsed host, or NULL if no host was
+ * specified or an error occured. Must be freed.
+ * port_out - An output pointer for the parsed port. Will be 0 on error.
+ *
+ * Returns 0 on success, otherwise an error.
+ */
+krb5_error_code
+k5_parse_host_string(const char *address, int default_port, char **host_out,
+ int *port_out)
+{
+ krb5_error_code ret;
+ int port_num;
+ const char *p, *host = NULL, *port = NULL;
+ char *endptr, *hostname = NULL;
+ size_t hostlen = 0;
+ unsigned long l;
+
+ *host_out = NULL;
+ *port_out = 0;
+
+ if (address == NULL || *address == '\0')
+ return EINVAL;
+ if (default_port < 0 || default_port > 65535)
+ return EINVAL;
+
+ /* Find the bounds of the host string and the start of the port string. */
+ if (is_string_numeric(address)) {
+ port = address;
+ } else if (*address == '[' && (p = strchr(address, ']')) != NULL) {
+ host = address + 1;
+ hostlen = p - host;
+ if (*(p + 1) == ':')
+ port = p + 2;
+ } else {
+ host = address;
+ hostlen = strcspn(host, " \t:");
+ if (host[hostlen] == ':')
+ port = host + hostlen + 1;
+ }
+
+ /* Parse the port number, or use the default port. */
+ if (port != NULL) {
+ errno = 0;
+ l = strtoul(port, &endptr, 10);
+ if (errno || endptr == port || *endptr != '\0' || l > 65535)
+ return EINVAL;
+ port_num = l;
+ } else {
+ port_num = default_port;
+ }
+
+ /* Copy the host if it was specified. */
+ if (host != NULL) {
+ hostname = k5memdup0(host, hostlen, &ret);
+ if (hostname == NULL)
+ return ENOMEM;
+ }
+
+ *host_out = hostname;
+ *port_out = port_num;
+ return 0;
+}
projects / thirdparty / krb5.git / commitdiff
