1 #pragma ident "%Z%%M% %I% %E% SMI" 2 /* 3 * lib/krb5/os/get_krbhst.c 4 * 5 * Copyright 1990,1991 by the Massachusetts Institute of Technology. 6 * All Rights Reserved. 7 * 8 * Export of this software from the United States of America may 9 * require a specific license from the United States Government. 10 * It is the responsibility of any person or organization contemplating 11 * export to obtain such a license before exporting. 12 * 13 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 14 * distribute this software and its documentation for any purpose and 15 * without fee is hereby granted, provided that the above copyright 16 * notice appear in all copies and that both that copyright notice and 17 * this permission notice appear in supporting documentation, and that 18 * the name of M.I.T. not be used in advertising or publicity pertaining 19 * to distribution of the software without specific, written prior 20 * permission. Furthermore if you modify this software you must label 21 * your software as modified software and not distribute it in such a 22 * fashion that it might be confused with the original M.I.T. software. 23 * M.I.T. makes no representations about the suitability of 24 * this software for any purpose. It is provided "as is" without express 25 * or implied warranty. 26 * 27 * 28 * krb5_get_krbhst() function. 29 */ 30 31 #include <k5-int.h> 32 #include <stdio.h> 33 #include <ctype.h> 34 35 /* 36 Figures out the Kerberos server names for the given realm, filling in a 37 pointer to an argv[] style list of names, terminated with a null pointer. 38 39 If the realm is unknown, the filled-in pointer is set to NULL. 40 41 The pointer array and strings pointed to are all in allocated storage, 42 and should be freed by the caller when finished. 43 44 returns system errors 45 */ 46 47 /* 48 * Implementation: the server names for given realms are stored in a 49 * configuration file, 50 * named by krb5_config_file; the first token (on the first line) in 51 * this file is taken as the default local realm name. 52 * 53 * Each succeeding line has a realm name as the first token, and a server name 54 * as a second token. Additional tokens may be present on the line, but 55 * are ignored by this function. 56 * 57 * All lines which begin with the desired realm name will have the 58 * hostname added to the list returned. 59 */ 60 61 krb5_error_code 62 krb5_get_krbhst(context, realm, hostlist) 63 krb5_context context; 64 const krb5_data *realm; 65 char ***hostlist; 66 { 67 char **values, **cpp, *cp; 68 const char *realm_kdc_names[4]; 69 krb5_error_code retval; 70 int i, count; 71 char **rethosts; 72 73 rethosts = 0; 74 75 realm_kdc_names[0] = "realms"; 76 realm_kdc_names[1] = realm->data; 77 realm_kdc_names[2] = "kdc"; 78 realm_kdc_names[3] = 0; 79 80 if (context->profile == 0) 81 return KRB5_CONFIG_CANTOPEN; 82 83 retval = profile_get_values(context->profile, realm_kdc_names, &values); 84 if (retval == PROF_NO_SECTION) 85 return KRB5_REALM_UNKNOWN; 86 if (retval == PROF_NO_RELATION) 87 return KRB5_CONFIG_BADFORMAT; 88 if (retval) 89 return retval; 90 91 /* 92 * Do cleanup over the list. We allow for some extra field to be 93 * added to the kdc line later (maybe the port number) 94 */ 95 for (cpp = values; *cpp; cpp++) { 96 cp = strchr(*cpp, ' '); 97 if (cp) 98 *cp = 0; 99 cp = strchr(*cpp, '\t'); 100 if (cp) 101 *cp = 0; 102 cp = strchr(*cpp, ':'); 103 if (cp) 104 *cp = 0; 105 } 106 count = cpp - values; 107 rethosts = malloc(sizeof(char *) * (count + 1)); 108 if (!rethosts) { 109 retval = ENOMEM; 110 goto cleanup; 111 } 112 for (i = 0; i < count; i++) { 113 int len = strlen (values[i]) + 1; 114 rethosts[i] = malloc(len); 115 if (!rethosts[i]) { 116 retval = ENOMEM; 117 goto cleanup; 118 } 119 memcpy (rethosts[i], values[i], len); 120 } 121 rethosts[count] = 0; 122 cleanup: 123 if (retval && rethosts) { 124 for (cpp = rethosts; *cpp; cpp++) 125 free(*cpp); 126 free(rethosts); 127 rethosts = 0; 128 } 129 profile_free_list(values); 130 *hostlist = rethosts; 131 return retval; 132 } 133