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/* Operations on network stuff.
Copyright (C) 2018-2019 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "common/common-defs.h"
#include "common/netstuff.h"
/* Standard C++ includes. */
#include <algorithm>
#ifdef USE_WIN32API
#if _WIN32_WINNT < 0x0501
# undef _WIN32_WINNT
# define _WIN32_WINNT 0x0501
#endif
#include <ws2tcpip.h>
#else
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#endif
/* See common/netstuff.h. */
scoped_free_addrinfo::~scoped_free_addrinfo ()
{
freeaddrinfo (m_res);
}
/* See common/netstuff.h. */
parsed_connection_spec
parse_connection_spec_without_prefix (std::string spec, struct addrinfo *hint)
{
parsed_connection_spec ret;
size_t last_colon_pos = 0;
/* We're dealing with IPv6 if:
- ai_family is AF_INET6, or
- ai_family is not AF_INET, and
- spec[0] is '[', or
- the number of ':' on spec is greater than 1. */
bool is_ipv6 = (hint->ai_family == AF_INET6
|| (hint->ai_family != AF_INET
&& (spec[0] == '['
|| std::count (spec.begin (),
spec.end (), ':') > 1)));
if (is_ipv6)
{
if (spec[0] == '[')
{
/* IPv6 addresses can be written as '[ADDR]:PORT', and we
support this notation. */
size_t close_bracket_pos = spec.find_first_of (']');
if (close_bracket_pos == std::string::npos)
error (_("Missing close bracket in hostname '%s'"),
spec.c_str ());
hint->ai_family = AF_INET6;
const char c = spec[close_bracket_pos + 1];
if (c == '\0')
last_colon_pos = std::string::npos;
else if (c != ':')
error (_("Invalid cruft after close bracket in '%s'"),
spec.c_str ());
/* Erase both '[' and ']'. */
spec.erase (0, 1);
spec.erase (close_bracket_pos - 1, 1);
}
else if (spec.find_first_of (']') != std::string::npos)
error (_("Missing open bracket in hostname '%s'"),
spec.c_str ());
}
if (last_colon_pos == 0)
last_colon_pos = spec.find_last_of (':');
/* The length of the hostname part. */
size_t host_len;
if (last_colon_pos != std::string::npos)
{
/* The user has provided a port. */
host_len = last_colon_pos;
ret.port_str = spec.substr (last_colon_pos + 1);
}
else
host_len = spec.size ();
ret.host_str = spec.substr (0, host_len);
/* Default hostname is localhost. */
if (ret.host_str.empty ())
ret.host_str = "localhost";
return ret;
}
/* See common/netstuff.h. */
parsed_connection_spec
parse_connection_spec (const char *spec, struct addrinfo *hint)
{
/* Struct to hold the association between valid prefixes, their
family and socktype. */
struct host_prefix
{
/* The prefix. */
const char *prefix;
/* The 'ai_family'. */
int family;
/* The 'ai_socktype'. */
int socktype;
};
static const struct host_prefix prefixes[] =
{
{ "udp:", AF_UNSPEC, SOCK_DGRAM },
{ "tcp:", AF_UNSPEC, SOCK_STREAM },
{ "udp4:", AF_INET, SOCK_DGRAM },
{ "tcp4:", AF_INET, SOCK_STREAM },
{ "udp6:", AF_INET6, SOCK_DGRAM },
{ "tcp6:", AF_INET6, SOCK_STREAM },
};
for (const host_prefix prefix : prefixes)
if (startswith (spec, prefix.prefix))
{
spec += strlen (prefix.prefix);
hint->ai_family = prefix.family;
hint->ai_socktype = prefix.socktype;
hint->ai_protocol
= hint->ai_socktype == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP;
break;
}
return parse_connection_spec_without_prefix (spec, hint);
}
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