group.c revision 158115
1/*- 2 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: head/usr.sbin/nscd/agents/group.c 158115 2006-04-28 12:03:38Z ume $"); 30 31#include <sys/param.h> 32#include <sys/types.h> 33#include <assert.h> 34#include <nsswitch.h> 35#include <grp.h> 36#include <string.h> 37#include <stdlib.h> 38#include "../debug.h" 39#include "passwd.h" 40 41static int group_marshal_func(struct group *, char *, size_t *); 42static int group_lookup_func(const char *, size_t, char **, size_t *); 43static void *group_mp_init_func(); 44static int group_mp_lookup_func(char **, size_t *, void *); 45static void group_mp_destroy_func(void *); 46 47static int 48group_marshal_func(struct group *grp, char *buffer, size_t *buffer_size) 49{ 50 struct group new_grp; 51 size_t desired_size, size, mem_size; 52 char *p, **mem; 53 54 TRACE_IN(group_marshal_func); 55 desired_size = ALIGNBYTES + sizeof(struct group) + sizeof(char *); 56 57 if (grp->gr_name != NULL) 58 desired_size += strlen(grp->gr_name) + 1; 59 if (grp->gr_passwd != NULL) 60 desired_size += strlen(grp->gr_passwd) + 1; 61 62 if (grp->gr_mem != NULL) { 63 mem_size = 0; 64 for (mem = grp->gr_mem; *mem; ++mem) { 65 desired_size += strlen(*mem) + 1; 66 ++mem_size; 67 } 68 69 desired_size += ALIGNBYTES + (mem_size + 1) * sizeof(char *); 70 } 71 72 if ((desired_size > *buffer_size) || (buffer == NULL)) { 73 *buffer_size = desired_size; 74 TRACE_OUT(group_marshal_func); 75 return (NS_RETURN); 76 } 77 78 memcpy(&new_grp, grp, sizeof(struct group)); 79 memset(buffer, 0, desired_size); 80 81 *buffer_size = desired_size; 82 p = buffer + sizeof(struct group) + sizeof(char *); 83 memcpy(buffer + sizeof(struct group), &p, sizeof(char *)); 84 p = (char *)ALIGN(p); 85 86 if (new_grp.gr_name != NULL) { 87 size = strlen(new_grp.gr_name); 88 memcpy(p, new_grp.gr_name, size); 89 new_grp.gr_name = p; 90 p += size + 1; 91 } 92 93 if (new_grp.gr_passwd != NULL) { 94 size = strlen(new_grp.gr_passwd); 95 memcpy(p, new_grp.gr_passwd, size); 96 new_grp.gr_passwd = p; 97 p += size + 1; 98 } 99 100 if (new_grp.gr_mem != NULL) { 101 p = (char *)ALIGN(p); 102 memcpy(p, new_grp.gr_mem, sizeof(char *) * mem_size); 103 new_grp.gr_mem = (char **)p; 104 p += sizeof(char *) * (mem_size + 1); 105 106 for (mem = new_grp.gr_mem; *mem; ++mem) { 107 size = strlen(*mem); 108 memcpy(p, *mem, size); 109 *mem = p; 110 p += size + 1; 111 } 112 } 113 114 memcpy(buffer, &new_grp, sizeof(struct group)); 115 TRACE_OUT(group_marshal_func); 116 return (NS_SUCCESS); 117} 118 119static int 120group_lookup_func(const char *key, size_t key_size, char **buffer, 121 size_t *buffer_size) 122{ 123 enum nss_lookup_type lookup_type; 124 char *name; 125 size_t size; 126 gid_t gid; 127 128 struct group *result; 129 130 TRACE_IN(group_lookup_func); 131 assert(buffer != NULL); 132 assert(buffer_size != NULL); 133 134 if (key_size < sizeof(enum nss_lookup_type)) { 135 TRACE_OUT(group_lookup_func); 136 return (NS_UNAVAIL); 137 } 138 memcpy(&lookup_type, key, sizeof(enum nss_lookup_type)); 139 140 switch (lookup_type) { 141 case nss_lt_name: 142 size = key_size - sizeof(enum nss_lookup_type) + 1; 143 name = (char *)malloc(size); 144 assert(name != NULL); 145 memset(name, 0, size); 146 memcpy(name, key + sizeof(enum nss_lookup_type), size - 1); 147 break; 148 case nss_lt_id: 149 if (key_size < sizeof(enum nss_lookup_type) + 150 sizeof(gid_t)) { 151 TRACE_OUT(passwd_lookup_func); 152 return (NS_UNAVAIL); 153 } 154 155 memcpy(&gid, key + sizeof(enum nss_lookup_type), sizeof(gid_t)); 156 break; 157 default: 158 TRACE_OUT(group_lookup_func); 159 return (NS_UNAVAIL); 160 } 161 162 switch (lookup_type) { 163 case nss_lt_name: 164 TRACE_STR(name); 165 result = getgrnam(name); 166 free(name); 167 break; 168 case nss_lt_id: 169 result = getgrgid(gid); 170 break; 171 default: 172 /* SHOULD NOT BE REACHED */ 173 break; 174 } 175 176 if (result != NULL) { 177 group_marshal_func(result, NULL, buffer_size); 178 *buffer = (char *)malloc(*buffer_size); 179 assert(*buffer != NULL); 180 group_marshal_func(result, *buffer, buffer_size); 181 } 182 183 TRACE_OUT(group_lookup_func); 184 return (result == NULL ? NS_NOTFOUND : NS_SUCCESS); 185} 186 187static void * 188group_mp_init_func() 189{ 190 TRACE_IN(group_mp_init_func); 191 setgrent(); 192 TRACE_OUT(group_mp_init_func); 193 194 return (NULL); 195} 196 197static int 198group_mp_lookup_func(char **buffer, size_t *buffer_size, void *mdata) 199{ 200 struct group *result; 201 202 TRACE_IN(group_mp_lookup_func); 203 result = getgrent(); 204 if (result != NULL) { 205 group_marshal_func(result, NULL, buffer_size); 206 *buffer = (char *)malloc(*buffer_size); 207 assert(*buffer != NULL); 208 group_marshal_func(result, *buffer, buffer_size); 209 } 210 211 TRACE_OUT(group_mp_lookup_func); 212 return (result == NULL ? NS_NOTFOUND : NS_SUCCESS); 213} 214 215static void 216group_mp_destroy_func(void *mdata) 217{ 218 TRACE_IN(group_mp_destroy_func); 219 TRACE_OUT(group_mp_destroy_func); 220} 221 222struct agent * 223init_group_agent() 224{ 225 struct common_agent *retval; 226 227 TRACE_IN(init_group_agent); 228 retval = (struct common_agent *)malloc(sizeof(struct common_agent)); 229 assert(retval != NULL); 230 memset(retval, 0, sizeof(struct common_agent)); 231 232 retval->parent.name = strdup("group"); 233 assert(retval->parent.name != NULL); 234 235 retval->parent.type = COMMON_AGENT; 236 retval->lookup_func = group_lookup_func; 237 238 TRACE_OUT(init_group_agent); 239 return ((struct agent *)retval); 240} 241 242struct agent * 243init_group_mp_agent() 244{ 245 struct multipart_agent *retval; 246 247 TRACE_IN(init_group_mp_agent); 248 retval = (struct multipart_agent *)malloc( 249 sizeof(struct multipart_agent)); 250 assert(retval != NULL); 251 memset(retval, 0, sizeof(struct multipart_agent)); 252 253 retval->parent.name = strdup("group"); 254 retval->parent.type = MULTIPART_AGENT; 255 retval->mp_init_func = group_mp_init_func; 256 retval->mp_lookup_func = group_mp_lookup_func; 257 retval->mp_destroy_func = group_mp_destroy_func; 258 assert(retval->parent.name != NULL); 259 260 TRACE_OUT(init_group_mp_agent); 261 return ((struct agent *)retval); 262} 263