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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/host_port.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/support/string.h"
int gpr_join_host_port(char **out, const char *host, int port) {
if (host[0] != '[' && strchr(host, ':') != NULL) {
/* IPv6 literals must be enclosed in brackets. */
return gpr_asprintf(out, "[%s]:%d", host, port);
} else {
/* Ordinary non-bracketed host:port. */
return gpr_asprintf(out, "%s:%d", host, port);
}
}
int gpr_split_host_port(const char *name, char **host, char **port) {
const char *host_start;
size_t host_len;
const char *port_start;
*host = NULL;
*port = NULL;
if (name[0] == '[') {
/* Parse a bracketed host, typically an IPv6 literal. */
const char *rbracket = strchr(name, ']');
if (rbracket == NULL) {
/* Unmatched [ */
return 0;
}
if (rbracket[1] == '\0') {
/* ]<end> */
port_start = NULL;
} else if (rbracket[1] == ':') {
/* ]:<port?> */
port_start = rbracket + 2;
} else {
/* ]<invalid> */
return 0;
}
host_start = name + 1;
host_len = (size_t)(rbracket - host_start);
if (memchr(host_start, ':', host_len) == NULL) {
/* Require all bracketed hosts to contain a colon, because a hostname or
IPv4 address should never use brackets. */
return 0;
}
} else {
const char *colon = strchr(name, ':');
if (colon != NULL && strchr(colon + 1, ':') == NULL) {
/* Exactly 1 colon. Split into host:port. */
host_start = name;
host_len = (size_t)(colon - name);
port_start = colon + 1;
} else {
/* 0 or 2+ colons. Bare hostname or IPv6 litearal. */
host_start = name;
host_len = strlen(name);
port_start = NULL;
}
}
/* Allocate return values. */
*host = (char *)gpr_malloc(host_len + 1);
memcpy(*host, host_start, host_len);
(*host)[host_len] = '\0';
if (port_start != NULL) {
*port = gpr_strdup(port_start);
}
return 1;
}
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