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c7ab0aef | 1 | /* Operations on network stuff. |
42a4f53d | 2 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
c7ab0aef SDJ |
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 <winsock2.h> | |
25 | #include <wspiapi.h> | |
26 | #else | |
27 | #include <netinet/in.h> | |
28 | #include <arpa/inet.h> | |
29 | #include <netdb.h> | |
30 | #include <sys/socket.h> | |
31 | #include <netinet/tcp.h> | |
32 | #endif | |
33 | ||
34 | /* See common/netstuff.h. */ | |
35 | ||
36 | scoped_free_addrinfo::~scoped_free_addrinfo () | |
37 | { | |
38 | freeaddrinfo (m_res); | |
39 | } | |
40 | ||
41 | /* See common/netstuff.h. */ | |
42 | ||
43 | parsed_connection_spec | |
44 | parse_connection_spec_without_prefix (std::string spec, struct addrinfo *hint) | |
45 | { | |
46 | parsed_connection_spec ret; | |
47 | size_t last_colon_pos = 0; | |
48 | /* We're dealing with IPv6 if: | |
49 | ||
50 | - ai_family is AF_INET6, or | |
51 | - ai_family is not AF_INET, and | |
52 | - spec[0] is '[', or | |
53 | - the number of ':' on spec is greater than 1. */ | |
54 | bool is_ipv6 = (hint->ai_family == AF_INET6 | |
55 | || (hint->ai_family != AF_INET | |
56 | && (spec[0] == '[' | |
57 | || std::count (spec.begin (), | |
58 | spec.end (), ':') > 1))); | |
59 | ||
60 | if (is_ipv6) | |
61 | { | |
62 | if (spec[0] == '[') | |
63 | { | |
64 | /* IPv6 addresses can be written as '[ADDR]:PORT', and we | |
65 | support this notation. */ | |
66 | size_t close_bracket_pos = spec.find_first_of (']'); | |
67 | ||
68 | if (close_bracket_pos == std::string::npos) | |
69 | error (_("Missing close bracket in hostname '%s'"), | |
70 | spec.c_str ()); | |
71 | ||
72 | hint->ai_family = AF_INET6; | |
73 | ||
74 | const char c = spec[close_bracket_pos + 1]; | |
75 | ||
76 | if (c == '\0') | |
77 | last_colon_pos = std::string::npos; | |
78 | else if (c != ':') | |
79 | error (_("Invalid cruft after close bracket in '%s'"), | |
80 | spec.c_str ()); | |
81 | ||
82 | /* Erase both '[' and ']'. */ | |
83 | spec.erase (0, 1); | |
84 | spec.erase (close_bracket_pos - 1, 1); | |
85 | } | |
86 | else if (spec.find_first_of (']') != std::string::npos) | |
87 | error (_("Missing open bracket in hostname '%s'"), | |
88 | spec.c_str ()); | |
89 | } | |
90 | ||
91 | if (last_colon_pos == 0) | |
92 | last_colon_pos = spec.find_last_of (':'); | |
93 | ||
94 | /* The length of the hostname part. */ | |
95 | size_t host_len; | |
96 | ||
97 | if (last_colon_pos != std::string::npos) | |
98 | { | |
99 | /* The user has provided a port. */ | |
100 | host_len = last_colon_pos; | |
101 | ret.port_str = spec.substr (last_colon_pos + 1); | |
102 | } | |
103 | else | |
104 | host_len = spec.size (); | |
105 | ||
106 | ret.host_str = spec.substr (0, host_len); | |
107 | ||
108 | /* Default hostname is localhost. */ | |
109 | if (ret.host_str.empty ()) | |
110 | ret.host_str = "localhost"; | |
111 | ||
112 | return ret; | |
113 | } | |
114 | ||
115 | /* See common/netstuff.h. */ | |
116 | ||
117 | parsed_connection_spec | |
118 | parse_connection_spec (const char *spec, struct addrinfo *hint) | |
119 | { | |
120 | /* Struct to hold the association between valid prefixes, their | |
121 | family and socktype. */ | |
122 | struct host_prefix | |
123 | { | |
124 | /* The prefix. */ | |
125 | const char *prefix; | |
126 | ||
127 | /* The 'ai_family'. */ | |
128 | int family; | |
129 | ||
130 | /* The 'ai_socktype'. */ | |
131 | int socktype; | |
132 | }; | |
133 | static const struct host_prefix prefixes[] = | |
134 | { | |
135 | { "udp:", AF_UNSPEC, SOCK_DGRAM }, | |
136 | { "tcp:", AF_UNSPEC, SOCK_STREAM }, | |
137 | { "udp4:", AF_INET, SOCK_DGRAM }, | |
138 | { "tcp4:", AF_INET, SOCK_STREAM }, | |
139 | { "udp6:", AF_INET6, SOCK_DGRAM }, | |
140 | { "tcp6:", AF_INET6, SOCK_STREAM }, | |
141 | }; | |
142 | ||
143 | for (const host_prefix prefix : prefixes) | |
144 | if (startswith (spec, prefix.prefix)) | |
145 | { | |
146 | spec += strlen (prefix.prefix); | |
147 | hint->ai_family = prefix.family; | |
148 | hint->ai_socktype = prefix.socktype; | |
149 | hint->ai_protocol | |
150 | = hint->ai_socktype == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP; | |
151 | break; | |
152 | } | |
153 | ||
154 | return parse_connection_spec_without_prefix (spec, hint); | |
155 | } |