| 1 | /* Operations on network stuff. |
| 2 | Copyright (C) 2018-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "common-defs.h" |
| 20 | #include "netstuff.h" |
| 21 | #include <algorithm> |
| 22 | |
| 23 | #ifdef USE_WIN32API |
| 24 | #include <ws2tcpip.h> |
| 25 | #else |
| 26 | #include <netinet/in.h> |
| 27 | #include <arpa/inet.h> |
| 28 | #include <netdb.h> |
| 29 | #include <sys/socket.h> |
| 30 | #include <netinet/tcp.h> |
| 31 | #endif |
| 32 | |
| 33 | /* See gdbsupport/netstuff.h. */ |
| 34 | |
| 35 | scoped_free_addrinfo::~scoped_free_addrinfo () |
| 36 | { |
| 37 | freeaddrinfo (m_res); |
| 38 | } |
| 39 | |
| 40 | /* See gdbsupport/netstuff.h. */ |
| 41 | |
| 42 | parsed_connection_spec |
| 43 | parse_connection_spec_without_prefix (std::string spec, struct addrinfo *hint) |
| 44 | { |
| 45 | parsed_connection_spec ret; |
| 46 | size_t last_colon_pos = 0; |
| 47 | /* We're dealing with IPv6 if: |
| 48 | |
| 49 | - ai_family is AF_INET6, or |
| 50 | - ai_family is not AF_INET, and |
| 51 | - spec[0] is '[', or |
| 52 | - the number of ':' on spec is greater than 1. */ |
| 53 | bool is_ipv6 = (hint->ai_family == AF_INET6 |
| 54 | || (hint->ai_family != AF_INET |
| 55 | && (spec[0] == '[' |
| 56 | || std::count (spec.begin (), |
| 57 | spec.end (), ':') > 1))); |
| 58 | |
| 59 | if (is_ipv6) |
| 60 | { |
| 61 | if (spec[0] == '[') |
| 62 | { |
| 63 | /* IPv6 addresses can be written as '[ADDR]:PORT', and we |
| 64 | support this notation. */ |
| 65 | size_t close_bracket_pos = spec.find_first_of (']'); |
| 66 | |
| 67 | if (close_bracket_pos == std::string::npos) |
| 68 | error (_("Missing close bracket in hostname '%s'"), |
| 69 | spec.c_str ()); |
| 70 | |
| 71 | hint->ai_family = AF_INET6; |
| 72 | |
| 73 | const char c = spec[close_bracket_pos + 1]; |
| 74 | |
| 75 | if (c == '\0') |
| 76 | last_colon_pos = std::string::npos; |
| 77 | else if (c != ':') |
| 78 | error (_("Invalid cruft after close bracket in '%s'"), |
| 79 | spec.c_str ()); |
| 80 | |
| 81 | /* Erase both '[' and ']'. */ |
| 82 | spec.erase (0, 1); |
| 83 | spec.erase (close_bracket_pos - 1, 1); |
| 84 | } |
| 85 | else if (spec.find_first_of (']') != std::string::npos) |
| 86 | error (_("Missing open bracket in hostname '%s'"), |
| 87 | spec.c_str ()); |
| 88 | } |
| 89 | |
| 90 | if (last_colon_pos == 0) |
| 91 | last_colon_pos = spec.find_last_of (':'); |
| 92 | |
| 93 | /* The length of the hostname part. */ |
| 94 | size_t host_len; |
| 95 | |
| 96 | if (last_colon_pos != std::string::npos) |
| 97 | { |
| 98 | /* The user has provided a port. */ |
| 99 | host_len = last_colon_pos; |
| 100 | ret.port_str = spec.substr (last_colon_pos + 1); |
| 101 | } |
| 102 | else |
| 103 | host_len = spec.size (); |
| 104 | |
| 105 | ret.host_str = spec.substr (0, host_len); |
| 106 | |
| 107 | /* Default hostname is localhost. */ |
| 108 | if (ret.host_str.empty ()) |
| 109 | ret.host_str = "localhost"; |
| 110 | |
| 111 | return ret; |
| 112 | } |
| 113 | |
| 114 | /* See gdbsupport/netstuff.h. */ |
| 115 | |
| 116 | parsed_connection_spec |
| 117 | parse_connection_spec (const char *spec, struct addrinfo *hint) |
| 118 | { |
| 119 | /* Struct to hold the association between valid prefixes, their |
| 120 | family and socktype. */ |
| 121 | struct host_prefix |
| 122 | { |
| 123 | /* The prefix. */ |
| 124 | const char *prefix; |
| 125 | |
| 126 | /* The 'ai_family'. */ |
| 127 | int family; |
| 128 | |
| 129 | /* The 'ai_socktype'. */ |
| 130 | int socktype; |
| 131 | }; |
| 132 | static const struct host_prefix prefixes[] = |
| 133 | { |
| 134 | { "udp:", AF_UNSPEC, SOCK_DGRAM }, |
| 135 | { "tcp:", AF_UNSPEC, SOCK_STREAM }, |
| 136 | { "udp4:", AF_INET, SOCK_DGRAM }, |
| 137 | { "tcp4:", AF_INET, SOCK_STREAM }, |
| 138 | { "udp6:", AF_INET6, SOCK_DGRAM }, |
| 139 | { "tcp6:", AF_INET6, SOCK_STREAM }, |
| 140 | }; |
| 141 | |
| 142 | for (const host_prefix prefix : prefixes) |
| 143 | if (startswith (spec, prefix.prefix)) |
| 144 | { |
| 145 | spec += strlen (prefix.prefix); |
| 146 | hint->ai_family = prefix.family; |
| 147 | hint->ai_socktype = prefix.socktype; |
| 148 | hint->ai_protocol |
| 149 | = hint->ai_socktype == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP; |
| 150 | break; |
| 151 | } |
| 152 | |
| 153 | return parse_connection_spec_without_prefix (spec, hint); |
| 154 | } |