diff options
Diffstat (limited to 'src/lib/ares__get_hostent.c')
| -rw-r--r-- | src/lib/ares__get_hostent.c | 415 |
1 files changed, 222 insertions, 193 deletions
diff --git a/src/lib/ares__get_hostent.c b/src/lib/ares__get_hostent.c index 367f390..9568b3b 100644 --- a/src/lib/ares__get_hostent.c +++ b/src/lib/ares__get_hostent.c @@ -1,17 +1,28 @@ - -/* Copyright 1998, 2011 by the Massachusetts Institute of Technology. +/* MIT License + * + * Copyright (c) 1998, 2011 Massachusetts Institute of Technology + * Copyright (c) The c-ares project and its contributors + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. * - * 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. + * SPDX-License-Identifier: MIT */ #include "ares_setup.h" @@ -28,17 +39,23 @@ #include "ares.h" #include "ares_inet_net_pton.h" -#include "ares_nowarn.h" #include "ares_private.h" -int ares__get_hostent(FILE *fp, int family, struct hostent **host) +ares_status_t ares__get_hostent(FILE *fp, int family, struct hostent **host) { - char *line = NULL, *p, *q, **alias; - char *txtaddr, *txthost, *txtalias; - int status; - size_t addrlen, linesize, naliases; + char *line = NULL; + char *p; + char *q; + char **alias; + const char *txtaddr; + const char *txthost; + char *txtalias; + ares_status_t status; + size_t addrlen; + size_t linesize; + size_t naliases; struct ares_addr addr; - struct hostent *hostent = NULL; + struct hostent *hostent = NULL; *host = NULL; /* Assume failure */ @@ -52,209 +69,221 @@ int ares__get_hostent(FILE *fp, int family, struct hostent **host) return ARES_EBADFAMILY; } - while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) - { - - /* Trim line comment. */ - p = line; - while (*p && (*p != '#')) - p++; - *p = '\0'; + while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) { + /* Trim line comment. */ + p = line; + while (*p && (*p != '#')) { + p++; + } + *p = '\0'; - /* Trim trailing whitespace. */ - q = p - 1; - while ((q >= line) && ISSPACE(*q)) - q--; - *++q = '\0'; + /* Trim trailing whitespace. */ + q = p - 1; + while ((q >= line) && ISSPACE(*q)) { + q--; + } + *++q = '\0'; - /* Skip leading whitespace. */ - p = line; - while (*p && ISSPACE(*p)) - p++; - if (!*p) - /* Ignore line if empty. */ - continue; + /* Skip leading whitespace. */ + p = line; + while (*p && ISSPACE(*p)) { + p++; + } + if (!*p) { + /* Ignore line if empty. */ + continue; + } - /* Pointer to start of IPv4 or IPv6 address part. */ - txtaddr = p; + /* Pointer to start of IPv4 or IPv6 address part. */ + txtaddr = p; - /* Advance past address part. */ - while (*p && !ISSPACE(*p)) - p++; - if (!*p) - /* Ignore line if reached end of line. */ - continue; + /* Advance past address part. */ + while (*p && !ISSPACE(*p)) { + p++; + } + if (!*p) { + /* Ignore line if reached end of line. */ + continue; + } - /* Null terminate address part. */ - *p = '\0'; + /* Null terminate address part. */ + *p = '\0'; - /* Advance to host name */ + /* Advance to host name */ + p++; + while (*p && ISSPACE(*p)) { p++; - while (*p && ISSPACE(*p)) - p++; - if (!*p) - /* Ignore line if reached end of line. */ - continue; /* LCOV_EXCL_LINE: trailing whitespace already stripped */ - - /* Pointer to start of host name. */ - txthost = p; + } + if (!*p) { + /* Ignore line if reached end of line. */ + continue; /* LCOV_EXCL_LINE: trailing whitespace already stripped */ + } - /* Advance past host name. */ - while (*p && !ISSPACE(*p)) - p++; + /* Pointer to start of host name. */ + txthost = p; - /* Pointer to start of first alias. */ - txtalias = NULL; - if (*p) - { - q = p + 1; - while (*q && ISSPACE(*q)) - q++; - if (*q) - txtalias = q; - } + /* Advance past host name. */ + while (*p && !ISSPACE(*p)) { + p++; + } - /* Null terminate host name. */ - *p = '\0'; + /* Pointer to start of first alias. */ + txtalias = NULL; + if (*p) { + q = p + 1; + while (*q && ISSPACE(*q)) { + q++; + } + if (*q) { + txtalias = q; + } + } - /* find out number of aliases. */ - naliases = 0; - if (txtalias) - { - p = txtalias; - while (*p) - { - while (*p && !ISSPACE(*p)) - p++; - while (*p && ISSPACE(*p)) - p++; - naliases++; - } - } + /* Null terminate host name. */ + *p = '\0'; - /* Convert address string to network address for the requested family. */ - addrlen = 0; - addr.family = AF_UNSPEC; - addr.addrV4.s_addr = INADDR_NONE; - if ((family == AF_INET) || (family == AF_UNSPEC)) - { - if (ares_inet_pton(AF_INET, txtaddr, &addr.addrV4) > 0) - { - /* Actual network address family and length. */ - addr.family = AF_INET; - addrlen = sizeof(addr.addrV4); - } + /* find out number of aliases. */ + naliases = 0; + if (txtalias) { + p = txtalias; + while (*p) { + while (*p && !ISSPACE(*p)) { + p++; } - if ((family == AF_INET6) || ((family == AF_UNSPEC) && (!addrlen))) - { - if (ares_inet_pton(AF_INET6, txtaddr, &addr.addrV6) > 0) - { - /* Actual network address family and length. */ - addr.family = AF_INET6; - addrlen = sizeof(addr.addrV6); - } + while (*p && ISSPACE(*p)) { + p++; } - if (!addrlen) - /* Ignore line if invalid address string for the requested family. */ - continue; + naliases++; + } + } + + /* Convert address string to network address for the requested family. */ + addrlen = 0; + addr.family = AF_UNSPEC; + addr.addrV4.s_addr = INADDR_NONE; + if ((family == AF_INET || family == AF_UNSPEC) && + ares_inet_pton(AF_INET, txtaddr, &addr.addrV4) > 0) { + /* Actual network address family and length. */ + addr.family = AF_INET; + addrlen = sizeof(addr.addrV4); + } + if ((family == AF_INET6 || (family == AF_UNSPEC && !addrlen)) && + ares_inet_pton(AF_INET6, txtaddr, &addr.addrV6) > 0) { + /* Actual network address family and length. */ + addr.family = AF_INET6; + addrlen = sizeof(addr.addrV6); + } + if (!addrlen) { + /* Ignore line if invalid address string for the requested family. */ + continue; + } - /* - ** Actual address family possible values are AF_INET and AF_INET6 only. - */ + /* + ** Actual address family possible values are AF_INET and AF_INET6 only. + */ - /* Allocate memory for the hostent structure. */ - hostent = ares_malloc(sizeof(struct hostent)); - if (!hostent) - break; + /* Allocate memory for the hostent structure. */ + hostent = ares_malloc(sizeof(struct hostent)); + if (!hostent) { + break; + } - /* Initialize fields for out of memory condition. */ - hostent->h_aliases = NULL; - hostent->h_addr_list = NULL; + /* Initialize fields for out of memory condition. */ + hostent->h_aliases = NULL; + hostent->h_addr_list = NULL; - /* Copy official host name. */ - hostent->h_name = ares_strdup(txthost); - if (!hostent->h_name) - break; + /* Copy official host name. */ + hostent->h_name = ares_strdup(txthost); + if (!hostent->h_name) { + break; + } - /* Copy network address. */ - hostent->h_addr_list = ares_malloc(2 * sizeof(char *)); - if (!hostent->h_addr_list) - break; - hostent->h_addr_list[1] = NULL; - hostent->h_addr_list[0] = ares_malloc(addrlen); - if (!hostent->h_addr_list[0]) - break; - if (addr.family == AF_INET) - memcpy(hostent->h_addr_list[0], &addr.addrV4, sizeof(addr.addrV4)); - else - memcpy(hostent->h_addr_list[0], &addr.addrV6, sizeof(addr.addrV6)); + /* Copy network address. */ + hostent->h_addr_list = ares_malloc(2 * sizeof(char *)); + if (!hostent->h_addr_list) { + break; + } + hostent->h_addr_list[1] = NULL; + hostent->h_addr_list[0] = ares_malloc(addrlen); + if (!hostent->h_addr_list[0]) { + break; + } + if (addr.family == AF_INET) { + memcpy(hostent->h_addr_list[0], &addr.addrV4, sizeof(addr.addrV4)); + } else { + memcpy(hostent->h_addr_list[0], &addr.addrV6, sizeof(addr.addrV6)); + } - /* Copy aliases. */ - hostent->h_aliases = ares_malloc((naliases + 1) * sizeof(char *)); - if (!hostent->h_aliases) - break; - alias = hostent->h_aliases; - while (naliases) - *(alias + naliases--) = NULL; - *alias = NULL; - while (txtalias) - { - p = txtalias; - while (*p && !ISSPACE(*p)) - p++; - q = p; - while (*q && ISSPACE(*q)) - q++; - *p = '\0'; - if ((*alias = ares_strdup(txtalias)) == NULL) - break; - alias++; - txtalias = *q ? q : NULL; - } - if (txtalias) - /* Alias memory allocation failure. */ + /* Copy aliases. */ + hostent->h_aliases = ares_malloc((naliases + 1) * sizeof(char *)); + if (!hostent->h_aliases) { + break; + } + alias = hostent->h_aliases; + while (naliases) { + *(alias + naliases--) = NULL; + } + *alias = NULL; + while (txtalias) { + p = txtalias; + while (*p && !ISSPACE(*p)) { + p++; + } + q = p; + while (*q && ISSPACE(*q)) { + q++; + } + *p = '\0'; + if ((*alias = ares_strdup(txtalias)) == NULL) { break; + } + alias++; + txtalias = *q ? q : NULL; + } + if (txtalias) { + /* Alias memory allocation failure. */ + break; + } - /* Copy actual network address family and length. */ - hostent->h_addrtype = aresx_sitoss(addr.family); - hostent->h_length = aresx_uztoss(addrlen); - - /* Free line buffer. */ - ares_free(line); + /* Copy actual network address family and length. */ + hostent->h_addrtype = addr.family; + hostent->h_length = (int)addrlen; - /* Return hostent successfully */ - *host = hostent; - return ARES_SUCCESS; + /* Free line buffer. */ + ares_free(line); - } + /* Return hostent successfully */ + *host = hostent; + return ARES_SUCCESS; + } /* If allocated, free line buffer. */ - if (line) + if (line) { ares_free(line); + } - if (status == ARES_SUCCESS) - { - /* Memory allocation failure; clean up. */ - if (hostent) - { - if (hostent->h_name) - ares_free((char *) hostent->h_name); - if (hostent->h_aliases) - { - for (alias = hostent->h_aliases; *alias; alias++) - ares_free(*alias); - ares_free(hostent->h_aliases); - } - if (hostent->h_addr_list) - { - if (hostent->h_addr_list[0]) - ares_free(hostent->h_addr_list[0]); - ares_free(hostent->h_addr_list); - } - ares_free(hostent); + if (status == ARES_SUCCESS) { + /* Memory allocation failure; clean up. */ + if (hostent) { + if (hostent->h_name) { + ares_free(hostent->h_name); + } + if (hostent->h_aliases) { + for (alias = hostent->h_aliases; *alias; alias++) { + ares_free(*alias); } - return ARES_ENOMEM; + ares_free(hostent->h_aliases); + } + if (hostent->h_addr_list) { + if (hostent->h_addr_list[0]) { + ares_free(hostent->h_addr_list[0]); + } + ares_free(hostent->h_addr_list); + } + ares_free(hostent); } + return ARES_ENOMEM; + } return status; } |