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author | neksard <neksard@yandex-team.ru> | 2022-02-10 16:45:23 +0300 |
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committer | Daniil Cherednik <dcherednik@yandex-team.ru> | 2022-02-10 16:45:23 +0300 |
commit | 8f7cf138264e0caa318144bf8a2c950e0b0a8593 (patch) | |
tree | 83bf5c8c8047c42d8475e6095df90ccdc3d1b57f /contrib/libs/c-ares/ares_gethostbyname.c | |
parent | d3a398281c6fd1d3672036cb2d63f842d2cb28c5 (diff) | |
download | ydb-8f7cf138264e0caa318144bf8a2c950e0b0a8593.tar.gz |
Restoring authorship annotation for <neksard@yandex-team.ru>. Commit 1 of 2.
Diffstat (limited to 'contrib/libs/c-ares/ares_gethostbyname.c')
-rw-r--r-- | contrib/libs/c-ares/ares_gethostbyname.c | 1000 |
1 files changed, 500 insertions, 500 deletions
diff --git a/contrib/libs/c-ares/ares_gethostbyname.c b/contrib/libs/c-ares/ares_gethostbyname.c index ecd03e7931..128d9ec2a6 100644 --- a/contrib/libs/c-ares/ares_gethostbyname.c +++ b/contrib/libs/c-ares/ares_gethostbyname.c @@ -1,100 +1,100 @@ - -/* Copyright 1998, 2011, 2013 by the Massachusetts Institute of Technology. - * - * Permission to use, copy, modify, and distribute this - * software and its documentation for any purpose and without - * fee is hereby granted, provided that the above copyright - * notice appear in all copies and that both that copyright - * notice and this permission notice appear in supporting - * documentation, and that the name of M.I.T. not be used in - * advertising or publicity pertaining to distribution of the - * software without specific, written prior permission. - * M.I.T. makes no representations about the suitability of - * this software for any purpose. It is provided "as is" - * without express or implied warranty. - */ - -#include "ares_setup.h" - -#ifdef HAVE_NETINET_IN_H -# include <netinet/in.h> -#endif -#ifdef HAVE_NETDB_H -# include <netdb.h> -#endif -#ifdef HAVE_ARPA_INET_H -# include <arpa/inet.h> -#endif -#ifdef HAVE_ARPA_NAMESER_H -# include <arpa/nameser.h> -#else -# include "nameser.h" -#endif -#ifdef HAVE_ARPA_NAMESER_COMPAT_H -# include <arpa/nameser_compat.h> -#endif - -#ifdef HAVE_STRINGS_H -#include <strings.h> -#endif - -#include "ares.h" -#include "ares_inet_net_pton.h" -#include "bitncmp.h" -#include "ares_platform.h" -#include "ares_nowarn.h" -#include "ares_private.h" - -#ifdef WATT32 -#undef WIN32 -#endif - -struct host_query { - /* Arguments passed to ares_gethostbyname() */ - ares_channel channel; - char *name; - ares_host_callback callback; - void *arg; - int sent_family; /* this family is what was is being used */ - int want_family; /* this family is what is asked for in the API */ - const char *remaining_lookups; - int timeouts; -}; - -static void next_lookup(struct host_query *hquery, int status_code); -static void host_callback(void *arg, int status, int timeouts, - unsigned char *abuf, int alen); -static void end_hquery(struct host_query *hquery, int status, - struct hostent *host); -static int fake_hostent(const char *name, int family, - ares_host_callback callback, void *arg); -static int file_lookup(const char *name, int family, struct hostent **host); -static void sort_addresses(struct hostent *host, - const struct apattern *sortlist, int nsort); -static void sort6_addresses(struct hostent *host, - const struct apattern *sortlist, int nsort); -static int get_address_index(const struct in_addr *addr, - const struct apattern *sortlist, int nsort); -static int get6_address_index(const struct ares_in6_addr *addr, - const struct apattern *sortlist, int nsort); - -void ares_gethostbyname(ares_channel channel, const char *name, int family, - ares_host_callback callback, void *arg) -{ - struct host_query *hquery; - - /* Right now we only know how to look up Internet addresses - and unspec - means try both basically. */ - switch (family) { - case AF_INET: - case AF_INET6: - case AF_UNSPEC: - break; - default: - callback(arg, ARES_ENOTIMP, 0, NULL); - return; - } - + +/* Copyright 1998, 2011, 2013 by the Massachusetts Institute of Technology. + * + * Permission to use, copy, modify, and distribute this + * software and its documentation for any purpose and without + * fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting + * documentation, and that the name of M.I.T. not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" + * without express or implied warranty. + */ + +#include "ares_setup.h" + +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif +#ifdef HAVE_NETDB_H +# include <netdb.h> +#endif +#ifdef HAVE_ARPA_INET_H +# include <arpa/inet.h> +#endif +#ifdef HAVE_ARPA_NAMESER_H +# include <arpa/nameser.h> +#else +# include "nameser.h" +#endif +#ifdef HAVE_ARPA_NAMESER_COMPAT_H +# include <arpa/nameser_compat.h> +#endif + +#ifdef HAVE_STRINGS_H +#include <strings.h> +#endif + +#include "ares.h" +#include "ares_inet_net_pton.h" +#include "bitncmp.h" +#include "ares_platform.h" +#include "ares_nowarn.h" +#include "ares_private.h" + +#ifdef WATT32 +#undef WIN32 +#endif + +struct host_query { + /* Arguments passed to ares_gethostbyname() */ + ares_channel channel; + char *name; + ares_host_callback callback; + void *arg; + int sent_family; /* this family is what was is being used */ + int want_family; /* this family is what is asked for in the API */ + const char *remaining_lookups; + int timeouts; +}; + +static void next_lookup(struct host_query *hquery, int status_code); +static void host_callback(void *arg, int status, int timeouts, + unsigned char *abuf, int alen); +static void end_hquery(struct host_query *hquery, int status, + struct hostent *host); +static int fake_hostent(const char *name, int family, + ares_host_callback callback, void *arg); +static int file_lookup(const char *name, int family, struct hostent **host); +static void sort_addresses(struct hostent *host, + const struct apattern *sortlist, int nsort); +static void sort6_addresses(struct hostent *host, + const struct apattern *sortlist, int nsort); +static int get_address_index(const struct in_addr *addr, + const struct apattern *sortlist, int nsort); +static int get6_address_index(const struct ares_in6_addr *addr, + const struct apattern *sortlist, int nsort); + +void ares_gethostbyname(ares_channel channel, const char *name, int family, + ares_host_callback callback, void *arg) +{ + struct host_query *hquery; + + /* Right now we only know how to look up Internet addresses - and unspec + means try both basically. */ + switch (family) { + case AF_INET: + case AF_INET6: + case AF_UNSPEC: + break; + default: + callback(arg, ARES_ENOTIMP, 0, NULL); + return; + } + /* Per RFC 7686, reject queries for ".onion" domain names with NXDOMAIN. */ if (ares__is_onion_domain(name)) { @@ -102,115 +102,115 @@ void ares_gethostbyname(ares_channel channel, const char *name, int family, return; } - if (fake_hostent(name, family, callback, arg)) - return; - - /* Allocate and fill in the host query structure. */ + if (fake_hostent(name, family, callback, arg)) + return; + + /* Allocate and fill in the host query structure. */ hquery = ares_malloc(sizeof(struct host_query)); - if (!hquery) - { - callback(arg, ARES_ENOMEM, 0, NULL); - return; - } - hquery->channel = channel; + if (!hquery) + { + callback(arg, ARES_ENOMEM, 0, NULL); + return; + } + hquery->channel = channel; hquery->name = ares_strdup(name); - hquery->want_family = family; - hquery->sent_family = -1; /* nothing is sent yet */ - if (!hquery->name) { + hquery->want_family = family; + hquery->sent_family = -1; /* nothing is sent yet */ + if (!hquery->name) { ares_free(hquery); - callback(arg, ARES_ENOMEM, 0, NULL); - return; - } - hquery->callback = callback; - hquery->arg = arg; - hquery->remaining_lookups = channel->lookups; - hquery->timeouts = 0; - - /* Start performing lookups according to channel->lookups. */ - next_lookup(hquery, ARES_ECONNREFUSED /* initial error code */); -} - -static void next_lookup(struct host_query *hquery, int status_code) -{ - const char *p; - struct hostent *host; - int status = status_code; - - for (p = hquery->remaining_lookups; *p; p++) - { - switch (*p) - { - case 'b': - /* DNS lookup */ - hquery->remaining_lookups = p + 1; - if ((hquery->want_family == AF_INET6) || - (hquery->want_family == AF_UNSPEC)) { - /* if inet6 or unspec, start out with AAAA */ - hquery->sent_family = AF_INET6; - ares_search(hquery->channel, hquery->name, C_IN, T_AAAA, - host_callback, hquery); - } - else { - hquery->sent_family = AF_INET; - ares_search(hquery->channel, hquery->name, C_IN, T_A, - host_callback, hquery); - } - return; - - case 'f': - /* Host file lookup */ - status = file_lookup(hquery->name, hquery->want_family, &host); - - /* this status check below previously checked for !ARES_ENOTFOUND, - but we should not assume that this single error code is the one - that can occur, as that is in fact no longer the case */ - if (status == ARES_SUCCESS) - { - end_hquery(hquery, status, host); - return; - } - status = status_code; /* Use original status code */ - break; - } - } - end_hquery(hquery, status, NULL); -} - -static void host_callback(void *arg, int status, int timeouts, - unsigned char *abuf, int alen) -{ - struct host_query *hquery = (struct host_query *) arg; - ares_channel channel = hquery->channel; - struct hostent *host = NULL; - - hquery->timeouts += timeouts; - if (status == ARES_SUCCESS) - { - if (hquery->sent_family == AF_INET) - { - status = ares_parse_a_reply(abuf, alen, &host, NULL, NULL); - if (host && channel->nsort) - sort_addresses(host, channel->sortlist, channel->nsort); - } - else if (hquery->sent_family == AF_INET6) - { - status = ares_parse_aaaa_reply(abuf, alen, &host, NULL, NULL); + callback(arg, ARES_ENOMEM, 0, NULL); + return; + } + hquery->callback = callback; + hquery->arg = arg; + hquery->remaining_lookups = channel->lookups; + hquery->timeouts = 0; + + /* Start performing lookups according to channel->lookups. */ + next_lookup(hquery, ARES_ECONNREFUSED /* initial error code */); +} + +static void next_lookup(struct host_query *hquery, int status_code) +{ + const char *p; + struct hostent *host; + int status = status_code; + + for (p = hquery->remaining_lookups; *p; p++) + { + switch (*p) + { + case 'b': + /* DNS lookup */ + hquery->remaining_lookups = p + 1; + if ((hquery->want_family == AF_INET6) || + (hquery->want_family == AF_UNSPEC)) { + /* if inet6 or unspec, start out with AAAA */ + hquery->sent_family = AF_INET6; + ares_search(hquery->channel, hquery->name, C_IN, T_AAAA, + host_callback, hquery); + } + else { + hquery->sent_family = AF_INET; + ares_search(hquery->channel, hquery->name, C_IN, T_A, + host_callback, hquery); + } + return; + + case 'f': + /* Host file lookup */ + status = file_lookup(hquery->name, hquery->want_family, &host); + + /* this status check below previously checked for !ARES_ENOTFOUND, + but we should not assume that this single error code is the one + that can occur, as that is in fact no longer the case */ + if (status == ARES_SUCCESS) + { + end_hquery(hquery, status, host); + return; + } + status = status_code; /* Use original status code */ + break; + } + } + end_hquery(hquery, status, NULL); +} + +static void host_callback(void *arg, int status, int timeouts, + unsigned char *abuf, int alen) +{ + struct host_query *hquery = (struct host_query *) arg; + ares_channel channel = hquery->channel; + struct hostent *host = NULL; + + hquery->timeouts += timeouts; + if (status == ARES_SUCCESS) + { + if (hquery->sent_family == AF_INET) + { + status = ares_parse_a_reply(abuf, alen, &host, NULL, NULL); + if (host && channel->nsort) + sort_addresses(host, channel->sortlist, channel->nsort); + } + else if (hquery->sent_family == AF_INET6) + { + status = ares_parse_aaaa_reply(abuf, alen, &host, NULL, NULL); if ((status == ARES_ENODATA || status == ARES_EBADRESP || (status == ARES_SUCCESS && host && host->h_addr_list[0] == NULL)) && hquery->want_family == AF_UNSPEC) { - /* The query returned something but either there were no AAAA - records (e.g. just CNAME) or the response was malformed. Try - looking up A instead. */ + /* The query returned something but either there were no AAAA + records (e.g. just CNAME) or the response was malformed. Try + looking up A instead. */ if (host) ares_free_hostent(host); - hquery->sent_family = AF_INET; - ares_search(hquery->channel, hquery->name, C_IN, T_A, - host_callback, hquery); - return; - } - if (host && channel->nsort) - sort6_addresses(host, channel->sortlist, channel->nsort); - } + hquery->sent_family = AF_INET; + ares_search(hquery->channel, hquery->name, C_IN, T_A, + host_callback, hquery); + return; + } + if (host && channel->nsort) + sort6_addresses(host, channel->sortlist, channel->nsort); + } if (status == ARES_SUCCESS && host && host->h_addr_list[0] == NULL) { /* The query returned something but had no A/AAAA record @@ -218,320 +218,320 @@ static void host_callback(void *arg, int status, int timeouts, so we should treat this as an error */ status = ARES_ENODATA; } - end_hquery(hquery, status, host); - } - else if ((status == ARES_ENODATA || status == ARES_EBADRESP || - status == ARES_ETIMEOUT) && (hquery->sent_family == AF_INET6 && - hquery->want_family == AF_UNSPEC)) - { - /* The AAAA query yielded no useful result. Now look up an A instead. */ - hquery->sent_family = AF_INET; - ares_search(hquery->channel, hquery->name, C_IN, T_A, host_callback, - hquery); - } - else if (status == ARES_EDESTRUCTION) - end_hquery(hquery, status, NULL); - else - next_lookup(hquery, status); -} - -static void end_hquery(struct host_query *hquery, int status, - struct hostent *host) -{ - hquery->callback(hquery->arg, status, hquery->timeouts, host); - if (host) - ares_free_hostent(host); + end_hquery(hquery, status, host); + } + else if ((status == ARES_ENODATA || status == ARES_EBADRESP || + status == ARES_ETIMEOUT) && (hquery->sent_family == AF_INET6 && + hquery->want_family == AF_UNSPEC)) + { + /* The AAAA query yielded no useful result. Now look up an A instead. */ + hquery->sent_family = AF_INET; + ares_search(hquery->channel, hquery->name, C_IN, T_A, host_callback, + hquery); + } + else if (status == ARES_EDESTRUCTION) + end_hquery(hquery, status, NULL); + else + next_lookup(hquery, status); +} + +static void end_hquery(struct host_query *hquery, int status, + struct hostent *host) +{ + hquery->callback(hquery->arg, status, hquery->timeouts, host); + if (host) + ares_free_hostent(host); ares_free(hquery->name); ares_free(hquery); -} - -/* If the name looks like an IP address, fake up a host entry, end the - * query immediately, and return true. Otherwise return false. - */ -static int fake_hostent(const char *name, int family, - ares_host_callback callback, void *arg) -{ - struct hostent hostent; - char *aliases[1] = { NULL }; - char *addrs[2]; - int result = 0; - struct in_addr in; - struct ares_in6_addr in6; - - if (family == AF_INET || family == AF_INET6) - { - /* It only looks like an IP address if it's all numbers and dots. */ - int numdots = 0, valid = 1; - const char *p; - for (p = name; *p; p++) - { - if (!ISDIGIT(*p) && *p != '.') { - valid = 0; - break; - } else if (*p == '.') { - numdots++; - } - } - - /* if we don't have 3 dots, it is illegal +} + +/* If the name looks like an IP address, fake up a host entry, end the + * query immediately, and return true. Otherwise return false. + */ +static int fake_hostent(const char *name, int family, + ares_host_callback callback, void *arg) +{ + struct hostent hostent; + char *aliases[1] = { NULL }; + char *addrs[2]; + int result = 0; + struct in_addr in; + struct ares_in6_addr in6; + + if (family == AF_INET || family == AF_INET6) + { + /* It only looks like an IP address if it's all numbers and dots. */ + int numdots = 0, valid = 1; + const char *p; + for (p = name; *p; p++) + { + if (!ISDIGIT(*p) && *p != '.') { + valid = 0; + break; + } else if (*p == '.') { + numdots++; + } + } + + /* if we don't have 3 dots, it is illegal * (although inet_pton doesn't think so). - */ - if (numdots != 3 || !valid) - result = 0; - else + */ + if (numdots != 3 || !valid) + result = 0; + else result = (ares_inet_pton(AF_INET, name, &in) < 1 ? 0 : 1); - - if (result) - family = AF_INET; - } - if (family == AF_INET6) - result = (ares_inet_pton(AF_INET6, name, &in6) < 1 ? 0 : 1); - - if (!result) - return 0; - - if (family == AF_INET) - { - hostent.h_length = (int)sizeof(struct in_addr); - addrs[0] = (char *)∈ - } - else if (family == AF_INET6) - { - hostent.h_length = (int)sizeof(struct ares_in6_addr); - addrs[0] = (char *)&in6; - } - /* Duplicate the name, to avoid a constness violation. */ + + if (result) + family = AF_INET; + } + if (family == AF_INET6) + result = (ares_inet_pton(AF_INET6, name, &in6) < 1 ? 0 : 1); + + if (!result) + return 0; + + if (family == AF_INET) + { + hostent.h_length = (int)sizeof(struct in_addr); + addrs[0] = (char *)∈ + } + else if (family == AF_INET6) + { + hostent.h_length = (int)sizeof(struct ares_in6_addr); + addrs[0] = (char *)&in6; + } + /* Duplicate the name, to avoid a constness violation. */ hostent.h_name = ares_strdup(name); - if (!hostent.h_name) - { - callback(arg, ARES_ENOMEM, 0, NULL); - return 1; - } - - /* Fill in the rest of the host structure and terminate the query. */ - addrs[1] = NULL; - hostent.h_aliases = aliases; - hostent.h_addrtype = aresx_sitoss(family); - hostent.h_addr_list = addrs; - callback(arg, ARES_SUCCESS, 0, &hostent); - + if (!hostent.h_name) + { + callback(arg, ARES_ENOMEM, 0, NULL); + return 1; + } + + /* Fill in the rest of the host structure and terminate the query. */ + addrs[1] = NULL; + hostent.h_aliases = aliases; + hostent.h_addrtype = aresx_sitoss(family); + hostent.h_addr_list = addrs; + callback(arg, ARES_SUCCESS, 0, &hostent); + ares_free((char *)(hostent.h_name)); - return 1; -} - -/* This is an API method */ -int ares_gethostbyname_file(ares_channel channel, const char *name, - int family, struct hostent **host) -{ - int result; - - /* We only take the channel to ensure that ares_init() been called. */ - if(channel == NULL) - { - /* Anything will do, really. This seems fine, and is consistent with - other error cases. */ - *host = NULL; - return ARES_ENOTFOUND; - } - - /* Just chain to the internal implementation we use here; it's exactly - * what we want. - */ - result = file_lookup(name, family, host); - if(result != ARES_SUCCESS) - { - /* We guarantee a NULL hostent on failure. */ - *host = NULL; - } - return result; -} - -static int file_lookup(const char *name, int family, struct hostent **host) -{ - FILE *fp; - char **alias; - int status; - int error; - -#ifdef WIN32 - char PATH_HOSTS[MAX_PATH]; - win_platform platform; - - PATH_HOSTS[0] = '\0'; - - platform = ares__getplatform(); - - if (platform == WIN_NT) { - char tmp[MAX_PATH]; - HKEY hkeyHosts; - + return 1; +} + +/* This is an API method */ +int ares_gethostbyname_file(ares_channel channel, const char *name, + int family, struct hostent **host) +{ + int result; + + /* We only take the channel to ensure that ares_init() been called. */ + if(channel == NULL) + { + /* Anything will do, really. This seems fine, and is consistent with + other error cases. */ + *host = NULL; + return ARES_ENOTFOUND; + } + + /* Just chain to the internal implementation we use here; it's exactly + * what we want. + */ + result = file_lookup(name, family, host); + if(result != ARES_SUCCESS) + { + /* We guarantee a NULL hostent on failure. */ + *host = NULL; + } + return result; +} + +static int file_lookup(const char *name, int family, struct hostent **host) +{ + FILE *fp; + char **alias; + int status; + int error; + +#ifdef WIN32 + char PATH_HOSTS[MAX_PATH]; + win_platform platform; + + PATH_HOSTS[0] = '\0'; + + platform = ares__getplatform(); + + if (platform == WIN_NT) { + char tmp[MAX_PATH]; + HKEY hkeyHosts; + if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY, 0, KEY_READ, - &hkeyHosts) == ERROR_SUCCESS) - { - DWORD dwLength = MAX_PATH; + &hkeyHosts) == ERROR_SUCCESS) + { + DWORD dwLength = MAX_PATH; RegQueryValueExA(hkeyHosts, DATABASEPATH, NULL, NULL, (LPBYTE)tmp, - &dwLength); + &dwLength); ExpandEnvironmentStringsA(tmp, PATH_HOSTS, MAX_PATH); - RegCloseKey(hkeyHosts); - } - } - else if (platform == WIN_9X) + RegCloseKey(hkeyHosts); + } + } + else if (platform == WIN_9X) GetWindowsDirectoryA(PATH_HOSTS, MAX_PATH); - else - return ARES_ENOTFOUND; - - strcat(PATH_HOSTS, WIN_PATH_HOSTS); - -#elif defined(WATT32) - extern const char *_w32_GetHostsFile (void); - const char *PATH_HOSTS = _w32_GetHostsFile(); - - if (!PATH_HOSTS) - return ARES_ENOTFOUND; -#endif - + else + return ARES_ENOTFOUND; + + strcat(PATH_HOSTS, WIN_PATH_HOSTS); + +#elif defined(WATT32) + extern const char *_w32_GetHostsFile (void); + const char *PATH_HOSTS = _w32_GetHostsFile(); + + if (!PATH_HOSTS) + return ARES_ENOTFOUND; +#endif + /* Per RFC 7686, reject queries for ".onion" domain names with NXDOMAIN. */ if (ares__is_onion_domain(name)) return ARES_ENOTFOUND; - fp = fopen(PATH_HOSTS, "r"); - if (!fp) - { - error = ERRNO; - switch(error) - { - case ENOENT: - case ESRCH: - return ARES_ENOTFOUND; - default: - DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", - error, strerror(error))); - DEBUGF(fprintf(stderr, "Error opening file: %s\n", - PATH_HOSTS)); - *host = NULL; - return ARES_EFILE; - } - } - while ((status = ares__get_hostent(fp, family, host)) == ARES_SUCCESS) - { - if (strcasecmp((*host)->h_name, name) == 0) - break; - for (alias = (*host)->h_aliases; *alias; alias++) - { - if (strcasecmp(*alias, name) == 0) - break; - } - if (*alias) - break; - ares_free_hostent(*host); - } - fclose(fp); - if (status == ARES_EOF) - status = ARES_ENOTFOUND; - if (status != ARES_SUCCESS) - *host = NULL; - return status; -} - -static void sort_addresses(struct hostent *host, - const struct apattern *sortlist, int nsort) -{ - struct in_addr a1, a2; - int i1, i2, ind1, ind2; - - /* This is a simple insertion sort, not optimized at all. i1 walks - * through the address list, with the loop invariant that everything - * to the left of i1 is sorted. In the loop body, the value at i1 is moved - * back through the list (via i2) until it is in sorted order. - */ - for (i1 = 0; host->h_addr_list[i1]; i1++) - { - memcpy(&a1, host->h_addr_list[i1], sizeof(struct in_addr)); - ind1 = get_address_index(&a1, sortlist, nsort); - for (i2 = i1 - 1; i2 >= 0; i2--) - { - memcpy(&a2, host->h_addr_list[i2], sizeof(struct in_addr)); - ind2 = get_address_index(&a2, sortlist, nsort); - if (ind2 <= ind1) - break; - memcpy(host->h_addr_list[i2 + 1], &a2, sizeof(struct in_addr)); - } - memcpy(host->h_addr_list[i2 + 1], &a1, sizeof(struct in_addr)); - } -} - -/* Find the first entry in sortlist which matches addr. Return nsort - * if none of them match. - */ -static int get_address_index(const struct in_addr *addr, - const struct apattern *sortlist, - int nsort) -{ - int i; - - for (i = 0; i < nsort; i++) - { - if (sortlist[i].family != AF_INET) - continue; - if (sortlist[i].type == PATTERN_MASK) - { - if ((addr->s_addr & sortlist[i].mask.addr4.s_addr) - == sortlist[i].addrV4.s_addr) - break; - } - else - { - if (!ares__bitncmp(&addr->s_addr, &sortlist[i].addrV4.s_addr, - sortlist[i].mask.bits)) - break; - } - } - return i; -} - -static void sort6_addresses(struct hostent *host, - const struct apattern *sortlist, int nsort) -{ - struct ares_in6_addr a1, a2; - int i1, i2, ind1, ind2; - - /* This is a simple insertion sort, not optimized at all. i1 walks - * through the address list, with the loop invariant that everything - * to the left of i1 is sorted. In the loop body, the value at i1 is moved - * back through the list (via i2) until it is in sorted order. - */ - for (i1 = 0; host->h_addr_list[i1]; i1++) - { - memcpy(&a1, host->h_addr_list[i1], sizeof(struct ares_in6_addr)); - ind1 = get6_address_index(&a1, sortlist, nsort); - for (i2 = i1 - 1; i2 >= 0; i2--) - { - memcpy(&a2, host->h_addr_list[i2], sizeof(struct ares_in6_addr)); - ind2 = get6_address_index(&a2, sortlist, nsort); - if (ind2 <= ind1) - break; - memcpy(host->h_addr_list[i2 + 1], &a2, sizeof(struct ares_in6_addr)); - } - memcpy(host->h_addr_list[i2 + 1], &a1, sizeof(struct ares_in6_addr)); - } -} - -/* Find the first entry in sortlist which matches addr. Return nsort - * if none of them match. - */ -static int get6_address_index(const struct ares_in6_addr *addr, - const struct apattern *sortlist, - int nsort) -{ - int i; - - for (i = 0; i < nsort; i++) - { - if (sortlist[i].family != AF_INET6) - continue; - if (!ares__bitncmp(addr, &sortlist[i].addrV6, sortlist[i].mask.bits)) - break; - } - return i; -} + fp = fopen(PATH_HOSTS, "r"); + if (!fp) + { + error = ERRNO; + switch(error) + { + case ENOENT: + case ESRCH: + return ARES_ENOTFOUND; + default: + DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", + error, strerror(error))); + DEBUGF(fprintf(stderr, "Error opening file: %s\n", + PATH_HOSTS)); + *host = NULL; + return ARES_EFILE; + } + } + while ((status = ares__get_hostent(fp, family, host)) == ARES_SUCCESS) + { + if (strcasecmp((*host)->h_name, name) == 0) + break; + for (alias = (*host)->h_aliases; *alias; alias++) + { + if (strcasecmp(*alias, name) == 0) + break; + } + if (*alias) + break; + ares_free_hostent(*host); + } + fclose(fp); + if (status == ARES_EOF) + status = ARES_ENOTFOUND; + if (status != ARES_SUCCESS) + *host = NULL; + return status; +} + +static void sort_addresses(struct hostent *host, + const struct apattern *sortlist, int nsort) +{ + struct in_addr a1, a2; + int i1, i2, ind1, ind2; + + /* This is a simple insertion sort, not optimized at all. i1 walks + * through the address list, with the loop invariant that everything + * to the left of i1 is sorted. In the loop body, the value at i1 is moved + * back through the list (via i2) until it is in sorted order. + */ + for (i1 = 0; host->h_addr_list[i1]; i1++) + { + memcpy(&a1, host->h_addr_list[i1], sizeof(struct in_addr)); + ind1 = get_address_index(&a1, sortlist, nsort); + for (i2 = i1 - 1; i2 >= 0; i2--) + { + memcpy(&a2, host->h_addr_list[i2], sizeof(struct in_addr)); + ind2 = get_address_index(&a2, sortlist, nsort); + if (ind2 <= ind1) + break; + memcpy(host->h_addr_list[i2 + 1], &a2, sizeof(struct in_addr)); + } + memcpy(host->h_addr_list[i2 + 1], &a1, sizeof(struct in_addr)); + } +} + +/* Find the first entry in sortlist which matches addr. Return nsort + * if none of them match. + */ +static int get_address_index(const struct in_addr *addr, + const struct apattern *sortlist, + int nsort) +{ + int i; + + for (i = 0; i < nsort; i++) + { + if (sortlist[i].family != AF_INET) + continue; + if (sortlist[i].type == PATTERN_MASK) + { + if ((addr->s_addr & sortlist[i].mask.addr4.s_addr) + == sortlist[i].addrV4.s_addr) + break; + } + else + { + if (!ares__bitncmp(&addr->s_addr, &sortlist[i].addrV4.s_addr, + sortlist[i].mask.bits)) + break; + } + } + return i; +} + +static void sort6_addresses(struct hostent *host, + const struct apattern *sortlist, int nsort) +{ + struct ares_in6_addr a1, a2; + int i1, i2, ind1, ind2; + + /* This is a simple insertion sort, not optimized at all. i1 walks + * through the address list, with the loop invariant that everything + * to the left of i1 is sorted. In the loop body, the value at i1 is moved + * back through the list (via i2) until it is in sorted order. + */ + for (i1 = 0; host->h_addr_list[i1]; i1++) + { + memcpy(&a1, host->h_addr_list[i1], sizeof(struct ares_in6_addr)); + ind1 = get6_address_index(&a1, sortlist, nsort); + for (i2 = i1 - 1; i2 >= 0; i2--) + { + memcpy(&a2, host->h_addr_list[i2], sizeof(struct ares_in6_addr)); + ind2 = get6_address_index(&a2, sortlist, nsort); + if (ind2 <= ind1) + break; + memcpy(host->h_addr_list[i2 + 1], &a2, sizeof(struct ares_in6_addr)); + } + memcpy(host->h_addr_list[i2 + 1], &a1, sizeof(struct ares_in6_addr)); + } +} + +/* Find the first entry in sortlist which matches addr. Return nsort + * if none of them match. + */ +static int get6_address_index(const struct ares_in6_addr *addr, + const struct apattern *sortlist, + int nsort) +{ + int i; + + for (i = 0; i < nsort; i++) + { + if (sortlist[i].family != AF_INET6) + continue; + if (!ares__bitncmp(addr, &sortlist[i].addrV6, sortlist[i].mask.bits)) + break; + } + return i; +} |