1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
9: *
10: * This software is licensed as described in the file COPYING, which
11: * you should have received as part of this distribution. The terms
12: * are also available at https://curl.haxx.se/docs/copyright.html.
13: *
14: * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15: * copies of the Software, and permit persons to whom the Software is
16: * furnished to do so, under the terms of the COPYING file.
17: *
18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19: * KIND, either express or implied.
20: *
21: ***************************************************************************/
22:
23: #include "curl_setup.h"
24:
25: /***********************************************************************
26: * Only for IPv6-enabled builds
27: **********************************************************************/
28: #ifdef CURLRES_IPV6
29:
30: #ifdef HAVE_NETINET_IN_H
31: #include <netinet/in.h>
32: #endif
33: #ifdef HAVE_NETDB_H
34: #include <netdb.h>
35: #endif
36: #ifdef HAVE_ARPA_INET_H
37: #include <arpa/inet.h>
38: #endif
39: #ifdef __VMS
40: #include <in.h>
41: #include <inet.h>
42: #endif
43:
44: #ifdef HAVE_PROCESS_H
45: #include <process.h>
46: #endif
47:
48: #include "urldata.h"
49: #include "sendf.h"
50: #include "hostip.h"
51: #include "hash.h"
52: #include "share.h"
53: #include "strerror.h"
54: #include "url.h"
55: #include "inet_pton.h"
56: #include "connect.h"
57: /* The last 3 #include files should be in this order */
58: #include "curl_printf.h"
59: #include "curl_memory.h"
60: #include "memdebug.h"
61:
62: /*
63: * Curl_ipv6works() returns TRUE if IPv6 seems to work.
64: */
65: bool Curl_ipv6works(struct connectdata *conn)
66: {
67: if(conn) {
68: /* the nature of most system is that IPv6 status doesn't come and go
69: during a program's lifetime so we only probe the first time and then we
70: have the info kept for fast re-use */
71: DEBUGASSERT(conn);
72: DEBUGASSERT(conn->data);
73: DEBUGASSERT(conn->data->multi);
74: return conn->data->multi->ipv6_works;
75: }
76: else {
77: int ipv6_works = -1;
78: /* probe to see if we have a working IPv6 stack */
79: curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
80: if(s == CURL_SOCKET_BAD)
81: /* an IPv6 address was requested but we can't get/use one */
82: ipv6_works = 0;
83: else {
84: ipv6_works = 1;
85: Curl_closesocket(NULL, s);
86: }
87: return (ipv6_works>0)?TRUE:FALSE;
88: }
89: }
90:
91: /*
92: * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
93: * been set and returns TRUE if they are OK.
94: */
95: bool Curl_ipvalid(struct connectdata *conn)
96: {
97: if(conn->ip_version == CURL_IPRESOLVE_V6)
98: return Curl_ipv6works(conn);
99:
100: return TRUE;
101: }
102:
103: #if defined(CURLRES_SYNCH)
104:
105: #ifdef DEBUG_ADDRINFO
106: static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
107: {
108: printf("dump_addrinfo:\n");
109: for(; ai; ai = ai->ai_next) {
110: char buf[INET6_ADDRSTRLEN];
111: printf(" fam %2d, CNAME %s, ",
112: ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
113: if(Curl_printable_address(ai, buf, sizeof(buf)))
114: printf("%s\n", buf);
115: else {
116: char buffer[STRERROR_LEN];
117: printf("failed; %s\n",
118: Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
119: }
120: }
121: }
122: #else
123: #define dump_addrinfo(x,y) Curl_nop_stmt
124: #endif
125:
126: /*
127: * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
128: * non-ares version).
129: *
130: * Returns name information about the given hostname and port number. If
131: * successful, the 'addrinfo' is returned and the forth argument will point to
132: * memory we need to free after use. That memory *MUST* be freed with
133: * Curl_freeaddrinfo(), nothing else.
134: */
135: Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
136: const char *hostname,
137: int port,
138: int *waitp)
139: {
140: struct addrinfo hints;
141: Curl_addrinfo *res;
142: int error;
143: char sbuf[12];
144: char *sbufptr = NULL;
145: #ifndef USE_RESOLVE_ON_IPS
146: char addrbuf[128];
147: #endif
148: int pf;
149: #if !defined(CURL_DISABLE_VERBOSE_STRINGS)
150: struct Curl_easy *data = conn->data;
151: #endif
152:
153: *waitp = 0; /* synchronous response only */
154:
155: /* Check if a limited name resolve has been requested */
156: switch(conn->ip_version) {
157: case CURL_IPRESOLVE_V4:
158: pf = PF_INET;
159: break;
160: case CURL_IPRESOLVE_V6:
161: pf = PF_INET6;
162: break;
163: default:
164: pf = PF_UNSPEC;
165: break;
166: }
167:
168: if((pf != PF_INET) && !Curl_ipv6works(conn))
169: /* The stack seems to be a non-IPv6 one */
170: pf = PF_INET;
171:
172: memset(&hints, 0, sizeof(hints));
173: hints.ai_family = pf;
174: hints.ai_socktype = (conn->transport == TRNSPRT_TCP) ?
175: SOCK_STREAM : SOCK_DGRAM;
176:
177: #ifndef USE_RESOLVE_ON_IPS
178: /*
179: * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
180: * an IPv4 address on iOS and Mac OS X.
181: */
182: if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
183: (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
184: /* the given address is numerical only, prevent a reverse lookup */
185: hints.ai_flags = AI_NUMERICHOST;
186: }
187: #endif
188:
189: if(port) {
190: msnprintf(sbuf, sizeof(sbuf), "%d", port);
191: sbufptr = sbuf;
192: }
193:
194: error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
195: if(error) {
196: infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
197: return NULL;
198: }
199:
200: if(port) {
201: Curl_addrinfo_set_port(res, port);
202: }
203:
204: dump_addrinfo(conn, res);
205:
206: return res;
207: }
208: #endif /* CURLRES_SYNCH */
209:
210: #endif /* CURLRES_IPV6 */
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