Annotation of embedaddon/curl/lib/curl_addrinfo.c, revision 1.1.1.1
1.1 misho 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: #include <curl/curl.h>
26:
27: #ifdef HAVE_NETINET_IN_H
28: # include <netinet/in.h>
29: #endif
30: #ifdef HAVE_NETINET_IN6_H
31: # include <netinet/in6.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 HAVE_SYS_UN_H
40: # include <sys/un.h>
41: #endif
42:
43: #ifdef __VMS
44: # include <in.h>
45: # include <inet.h>
46: #endif
47:
48: #if defined(NETWARE) && defined(__NOVELL_LIBC__)
49: # undef in_addr_t
50: # define in_addr_t unsigned long
51: #endif
52:
53: #include <stddef.h>
54:
55: #include "curl_addrinfo.h"
56: #include "inet_pton.h"
57: #include "warnless.h"
58: /* The last 3 #include files should be in this order */
59: #include "curl_printf.h"
60: #include "curl_memory.h"
61: #include "memdebug.h"
62:
63: /*
64: * Curl_freeaddrinfo()
65: *
66: * This is used to free a linked list of Curl_addrinfo structs along
67: * with all its associated allocated storage. This function should be
68: * called once for each successful call to Curl_getaddrinfo_ex() or to
69: * any function call which actually allocates a Curl_addrinfo struct.
70: */
71:
72: #if defined(__INTEL_COMPILER) && (__INTEL_COMPILER == 910) && \
73: defined(__OPTIMIZE__) && defined(__unix__) && defined(__i386__)
74: /* workaround icc 9.1 optimizer issue */
75: # define vqualifier volatile
76: #else
77: # define vqualifier
78: #endif
79:
80: void
81: Curl_freeaddrinfo(Curl_addrinfo *cahead)
82: {
83: Curl_addrinfo *vqualifier canext;
84: Curl_addrinfo *ca;
85:
86: for(ca = cahead; ca != NULL; ca = canext) {
87: free(ca->ai_addr);
88: free(ca->ai_canonname);
89: canext = ca->ai_next;
90:
91: free(ca);
92: }
93: }
94:
95:
96: #ifdef HAVE_GETADDRINFO
97: /*
98: * Curl_getaddrinfo_ex()
99: *
100: * This is a wrapper function around system's getaddrinfo(), with
101: * the only difference that instead of returning a linked list of
102: * addrinfo structs this one returns a linked list of Curl_addrinfo
103: * ones. The memory allocated by this function *MUST* be free'd with
104: * Curl_freeaddrinfo(). For each successful call to this function
105: * there must be an associated call later to Curl_freeaddrinfo().
106: *
107: * There should be no single call to system's getaddrinfo() in the
108: * whole library, any such call should be 'routed' through this one.
109: */
110:
111: int
112: Curl_getaddrinfo_ex(const char *nodename,
113: const char *servname,
114: const struct addrinfo *hints,
115: Curl_addrinfo **result)
116: {
117: const struct addrinfo *ai;
118: struct addrinfo *aihead;
119: Curl_addrinfo *cafirst = NULL;
120: Curl_addrinfo *calast = NULL;
121: Curl_addrinfo *ca;
122: size_t ss_size;
123: int error;
124:
125: *result = NULL; /* assume failure */
126:
127: error = getaddrinfo(nodename, servname, hints, &aihead);
128: if(error)
129: return error;
130:
131: /* traverse the addrinfo list */
132:
133: for(ai = aihead; ai != NULL; ai = ai->ai_next) {
134:
135: /* ignore elements with unsupported address family, */
136: /* settle family-specific sockaddr structure size. */
137: if(ai->ai_family == AF_INET)
138: ss_size = sizeof(struct sockaddr_in);
139: #ifdef ENABLE_IPV6
140: else if(ai->ai_family == AF_INET6)
141: ss_size = sizeof(struct sockaddr_in6);
142: #endif
143: else
144: continue;
145:
146: /* ignore elements without required address info */
147: if((ai->ai_addr == NULL) || !(ai->ai_addrlen > 0))
148: continue;
149:
150: /* ignore elements with bogus address size */
151: if((size_t)ai->ai_addrlen < ss_size)
152: continue;
153:
154: ca = malloc(sizeof(Curl_addrinfo));
155: if(!ca) {
156: error = EAI_MEMORY;
157: break;
158: }
159:
160: /* copy each structure member individually, member ordering, */
161: /* size, or padding might be different for each platform. */
162:
163: ca->ai_flags = ai->ai_flags;
164: ca->ai_family = ai->ai_family;
165: ca->ai_socktype = ai->ai_socktype;
166: ca->ai_protocol = ai->ai_protocol;
167: ca->ai_addrlen = (curl_socklen_t)ss_size;
168: ca->ai_addr = NULL;
169: ca->ai_canonname = NULL;
170: ca->ai_next = NULL;
171:
172: ca->ai_addr = malloc(ss_size);
173: if(!ca->ai_addr) {
174: error = EAI_MEMORY;
175: free(ca);
176: break;
177: }
178: memcpy(ca->ai_addr, ai->ai_addr, ss_size);
179:
180: if(ai->ai_canonname != NULL) {
181: ca->ai_canonname = strdup(ai->ai_canonname);
182: if(!ca->ai_canonname) {
183: error = EAI_MEMORY;
184: free(ca->ai_addr);
185: free(ca);
186: break;
187: }
188: }
189:
190: /* if the return list is empty, this becomes the first element */
191: if(!cafirst)
192: cafirst = ca;
193:
194: /* add this element last in the return list */
195: if(calast)
196: calast->ai_next = ca;
197: calast = ca;
198:
199: }
200:
201: /* destroy the addrinfo list */
202: if(aihead)
203: freeaddrinfo(aihead);
204:
205: /* if we failed, also destroy the Curl_addrinfo list */
206: if(error) {
207: Curl_freeaddrinfo(cafirst);
208: cafirst = NULL;
209: }
210: else if(!cafirst) {
211: #ifdef EAI_NONAME
212: /* rfc3493 conformant */
213: error = EAI_NONAME;
214: #else
215: /* rfc3493 obsoleted */
216: error = EAI_NODATA;
217: #endif
218: #ifdef USE_WINSOCK
219: SET_SOCKERRNO(error);
220: #endif
221: }
222:
223: *result = cafirst;
224:
225: /* This is not a CURLcode */
226: return error;
227: }
228: #endif /* HAVE_GETADDRINFO */
229:
230:
231: /*
232: * Curl_he2ai()
233: *
234: * This function returns a pointer to the first element of a newly allocated
235: * Curl_addrinfo struct linked list filled with the data of a given hostent.
236: * Curl_addrinfo is meant to work like the addrinfo struct does for a IPv6
237: * stack, but usable also for IPv4, all hosts and environments.
238: *
239: * The memory allocated by this function *MUST* be free'd later on calling
240: * Curl_freeaddrinfo(). For each successful call to this function there
241: * must be an associated call later to Curl_freeaddrinfo().
242: *
243: * Curl_addrinfo defined in "lib/curl_addrinfo.h"
244: *
245: * struct Curl_addrinfo {
246: * int ai_flags;
247: * int ai_family;
248: * int ai_socktype;
249: * int ai_protocol;
250: * curl_socklen_t ai_addrlen; * Follow rfc3493 struct addrinfo *
251: * char *ai_canonname;
252: * struct sockaddr *ai_addr;
253: * struct Curl_addrinfo *ai_next;
254: * };
255: * typedef struct Curl_addrinfo Curl_addrinfo;
256: *
257: * hostent defined in <netdb.h>
258: *
259: * struct hostent {
260: * char *h_name;
261: * char **h_aliases;
262: * int h_addrtype;
263: * int h_length;
264: * char **h_addr_list;
265: * };
266: *
267: * for backward compatibility:
268: *
269: * #define h_addr h_addr_list[0]
270: */
271:
272: Curl_addrinfo *
273: Curl_he2ai(const struct hostent *he, int port)
274: {
275: Curl_addrinfo *ai;
276: Curl_addrinfo *prevai = NULL;
277: Curl_addrinfo *firstai = NULL;
278: struct sockaddr_in *addr;
279: #ifdef ENABLE_IPV6
280: struct sockaddr_in6 *addr6;
281: #endif
282: CURLcode result = CURLE_OK;
283: int i;
284: char *curr;
285:
286: if(!he)
287: /* no input == no output! */
288: return NULL;
289:
290: DEBUGASSERT((he->h_name != NULL) && (he->h_addr_list != NULL));
291:
292: for(i = 0; (curr = he->h_addr_list[i]) != NULL; i++) {
293:
294: size_t ss_size;
295: #ifdef ENABLE_IPV6
296: if(he->h_addrtype == AF_INET6)
297: ss_size = sizeof(struct sockaddr_in6);
298: else
299: #endif
300: ss_size = sizeof(struct sockaddr_in);
301:
302: ai = calloc(1, sizeof(Curl_addrinfo));
303: if(!ai) {
304: result = CURLE_OUT_OF_MEMORY;
305: break;
306: }
307: ai->ai_canonname = strdup(he->h_name);
308: if(!ai->ai_canonname) {
309: result = CURLE_OUT_OF_MEMORY;
310: free(ai);
311: break;
312: }
313: ai->ai_addr = calloc(1, ss_size);
314: if(!ai->ai_addr) {
315: result = CURLE_OUT_OF_MEMORY;
316: free(ai->ai_canonname);
317: free(ai);
318: break;
319: }
320:
321: if(!firstai)
322: /* store the pointer we want to return from this function */
323: firstai = ai;
324:
325: if(prevai)
326: /* make the previous entry point to this */
327: prevai->ai_next = ai;
328:
329: ai->ai_family = he->h_addrtype;
330:
331: /* we return all names as STREAM, so when using this address for TFTP
332: the type must be ignored and conn->socktype be used instead! */
333: ai->ai_socktype = SOCK_STREAM;
334:
335: ai->ai_addrlen = (curl_socklen_t)ss_size;
336:
337: /* leave the rest of the struct filled with zero */
338:
339: switch(ai->ai_family) {
340: case AF_INET:
341: addr = (void *)ai->ai_addr; /* storage area for this info */
342:
343: memcpy(&addr->sin_addr, curr, sizeof(struct in_addr));
344: addr->sin_family = (CURL_SA_FAMILY_T)(he->h_addrtype);
345: addr->sin_port = htons((unsigned short)port);
346: break;
347:
348: #ifdef ENABLE_IPV6
349: case AF_INET6:
350: addr6 = (void *)ai->ai_addr; /* storage area for this info */
351:
352: memcpy(&addr6->sin6_addr, curr, sizeof(struct in6_addr));
353: addr6->sin6_family = (CURL_SA_FAMILY_T)(he->h_addrtype);
354: addr6->sin6_port = htons((unsigned short)port);
355: break;
356: #endif
357: }
358:
359: prevai = ai;
360: }
361:
362: if(result) {
363: Curl_freeaddrinfo(firstai);
364: firstai = NULL;
365: }
366:
367: return firstai;
368: }
369:
370:
371: struct namebuff {
372: struct hostent hostentry;
373: union {
374: struct in_addr ina4;
375: #ifdef ENABLE_IPV6
376: struct in6_addr ina6;
377: #endif
378: } addrentry;
379: char *h_addr_list[2];
380: };
381:
382:
383: /*
384: * Curl_ip2addr()
385: *
386: * This function takes an internet address, in binary form, as input parameter
387: * along with its address family and the string version of the address, and it
388: * returns a Curl_addrinfo chain filled in correctly with information for the
389: * given address/host
390: */
391:
392: Curl_addrinfo *
393: Curl_ip2addr(int af, const void *inaddr, const char *hostname, int port)
394: {
395: Curl_addrinfo *ai;
396:
397: #if defined(__VMS) && \
398: defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64)
399: #pragma pointer_size save
400: #pragma pointer_size short
401: #pragma message disable PTRMISMATCH
402: #endif
403:
404: struct hostent *h;
405: struct namebuff *buf;
406: char *addrentry;
407: char *hoststr;
408: size_t addrsize;
409:
410: DEBUGASSERT(inaddr && hostname);
411:
412: buf = malloc(sizeof(struct namebuff));
413: if(!buf)
414: return NULL;
415:
416: hoststr = strdup(hostname);
417: if(!hoststr) {
418: free(buf);
419: return NULL;
420: }
421:
422: switch(af) {
423: case AF_INET:
424: addrsize = sizeof(struct in_addr);
425: addrentry = (void *)&buf->addrentry.ina4;
426: memcpy(addrentry, inaddr, sizeof(struct in_addr));
427: break;
428: #ifdef ENABLE_IPV6
429: case AF_INET6:
430: addrsize = sizeof(struct in6_addr);
431: addrentry = (void *)&buf->addrentry.ina6;
432: memcpy(addrentry, inaddr, sizeof(struct in6_addr));
433: break;
434: #endif
435: default:
436: free(hoststr);
437: free(buf);
438: return NULL;
439: }
440:
441: h = &buf->hostentry;
442: h->h_name = hoststr;
443: h->h_aliases = NULL;
444: h->h_addrtype = (short)af;
445: h->h_length = (short)addrsize;
446: h->h_addr_list = &buf->h_addr_list[0];
447: h->h_addr_list[0] = addrentry;
448: h->h_addr_list[1] = NULL; /* terminate list of entries */
449:
450: #if defined(__VMS) && \
451: defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64)
452: #pragma pointer_size restore
453: #pragma message enable PTRMISMATCH
454: #endif
455:
456: ai = Curl_he2ai(h, port);
457:
458: free(hoststr);
459: free(buf);
460:
461: return ai;
462: }
463:
464: /*
465: * Given an IPv4 or IPv6 dotted string address, this converts it to a proper
466: * allocated Curl_addrinfo struct and returns it.
467: */
468: Curl_addrinfo *Curl_str2addr(char *address, int port)
469: {
470: struct in_addr in;
471: if(Curl_inet_pton(AF_INET, address, &in) > 0)
472: /* This is a dotted IP address 123.123.123.123-style */
473: return Curl_ip2addr(AF_INET, &in, address, port);
474: #ifdef ENABLE_IPV6
475: {
476: struct in6_addr in6;
477: if(Curl_inet_pton(AF_INET6, address, &in6) > 0)
478: /* This is a dotted IPv6 address ::1-style */
479: return Curl_ip2addr(AF_INET6, &in6, address, port);
480: }
481: #endif
482: return NULL; /* bad input format */
483: }
484:
485: #ifdef USE_UNIX_SOCKETS
486: /**
487: * Given a path to a Unix domain socket, return a newly allocated Curl_addrinfo
488: * struct initialized with this path.
489: * Set '*longpath' to TRUE if the error is a too long path.
490: */
491: Curl_addrinfo *Curl_unix2addr(const char *path, bool *longpath, bool abstract)
492: {
493: Curl_addrinfo *ai;
494: struct sockaddr_un *sa_un;
495: size_t path_len;
496:
497: *longpath = FALSE;
498:
499: ai = calloc(1, sizeof(Curl_addrinfo));
500: if(!ai)
501: return NULL;
502: ai->ai_addr = calloc(1, sizeof(struct sockaddr_un));
503: if(!ai->ai_addr) {
504: free(ai);
505: return NULL;
506: }
507:
508: sa_un = (void *) ai->ai_addr;
509: sa_un->sun_family = AF_UNIX;
510:
511: /* sun_path must be able to store the NUL-terminated path */
512: path_len = strlen(path) + 1;
513: if(path_len > sizeof(sa_un->sun_path)) {
514: free(ai->ai_addr);
515: free(ai);
516: *longpath = TRUE;
517: return NULL;
518: }
519:
520: ai->ai_family = AF_UNIX;
521: ai->ai_socktype = SOCK_STREAM; /* assume reliable transport for HTTP */
522: ai->ai_addrlen = (curl_socklen_t)
523: ((offsetof(struct sockaddr_un, sun_path) + path_len) & 0x7FFFFFFF);
524:
525: /* Abstract Unix domain socket have NULL prefix instead of suffix */
526: if(abstract)
527: memcpy(sa_un->sun_path + 1, path, path_len - 1);
528: else
529: memcpy(sa_un->sun_path, path, path_len); /* copy NUL byte */
530:
531: return ai;
532: }
533: #endif
534:
535: #if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) && \
536: defined(HAVE_FREEADDRINFO)
537: /*
538: * curl_dbg_freeaddrinfo()
539: *
540: * This is strictly for memory tracing and are using the same style as the
541: * family otherwise present in memdebug.c. I put these ones here since they
542: * require a bunch of structs I didn't want to include in memdebug.c
543: */
544:
545: void
546: curl_dbg_freeaddrinfo(struct addrinfo *freethis,
547: int line, const char *source)
548: {
549: curl_dbg_log("ADDR %s:%d freeaddrinfo(%p)\n",
550: source, line, (void *)freethis);
551: #ifdef USE_LWIPSOCK
552: lwip_freeaddrinfo(freethis);
553: #else
554: (freeaddrinfo)(freethis);
555: #endif
556: }
557: #endif /* defined(CURLDEBUG) && defined(HAVE_FREEADDRINFO) */
558:
559:
560: #if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO)
561: /*
562: * curl_dbg_getaddrinfo()
563: *
564: * This is strictly for memory tracing and are using the same style as the
565: * family otherwise present in memdebug.c. I put these ones here since they
566: * require a bunch of structs I didn't want to include in memdebug.c
567: */
568:
569: int
570: curl_dbg_getaddrinfo(const char *hostname,
571: const char *service,
572: const struct addrinfo *hints,
573: struct addrinfo **result,
574: int line, const char *source)
575: {
576: #ifdef USE_LWIPSOCK
577: int res = lwip_getaddrinfo(hostname, service, hints, result);
578: #else
579: int res = (getaddrinfo)(hostname, service, hints, result);
580: #endif
581: if(0 == res)
582: /* success */
583: curl_dbg_log("ADDR %s:%d getaddrinfo() = %p\n",
584: source, line, (void *)*result);
585: else
586: curl_dbg_log("ADDR %s:%d getaddrinfo() failed\n",
587: source, line);
588: return res;
589: }
590: #endif /* defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) */
591:
592: #if defined(HAVE_GETADDRINFO) && defined(USE_RESOLVE_ON_IPS)
593: /*
594: * Work-arounds the sin6_port is always zero bug on iOS 9.3.2 and Mac OS X
595: * 10.11.5.
596: */
597: void Curl_addrinfo_set_port(Curl_addrinfo *addrinfo, int port)
598: {
599: Curl_addrinfo *ca;
600: struct sockaddr_in *addr;
601: #ifdef ENABLE_IPV6
602: struct sockaddr_in6 *addr6;
603: #endif
604: for(ca = addrinfo; ca != NULL; ca = ca->ai_next) {
605: switch(ca->ai_family) {
606: case AF_INET:
607: addr = (void *)ca->ai_addr; /* storage area for this info */
608: addr->sin_port = htons((unsigned short)port);
609: break;
610:
611: #ifdef ENABLE_IPV6
612: case AF_INET6:
613: addr6 = (void *)ca->ai_addr; /* storage area for this info */
614: addr6->sin6_port = htons((unsigned short)port);
615: break;
616: #endif
617: }
618: }
619: }
620: #endif
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