Annotation of embedaddon/sudo/src/hooks.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (c) 2012 Todd C. Miller <Todd.Miller@courtesan.com>
! 3: *
! 4: * Permission to use, copy, modify, and distribute this software for any
! 5: * purpose with or without fee is hereby granted, provided that the above
! 6: * copyright notice and this permission notice appear in all copies.
! 7: *
! 8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 15: */
! 16:
! 17: #include <config.h>
! 18:
! 19: #include <sys/types.h>
! 20: #include <stdio.h>
! 21: #ifdef STDC_HEADERS
! 22: # include <stdlib.h>
! 23: # include <stddef.h>
! 24: #else
! 25: # ifdef HAVE_STDLIB_H
! 26: # include <stdlib.h>
! 27: # endif
! 28: #endif /* STDC_HEADERS */
! 29: #ifdef HAVE_STRING_H
! 30: # include <string.h>
! 31: #endif /* HAVE_STRING_H */
! 32: #ifdef HAVE_STRINGS_H
! 33: # include <strings.h>
! 34: #endif /* HAVE_STRINGS_H */
! 35: #ifdef HAVE_UNISTD_H
! 36: # include <unistd.h>
! 37: #endif /* HAVE_UNISTD_H */
! 38:
! 39: #include "sudo.h"
! 40: #include "sudo_plugin.h"
! 41: #include "sudo_plugin_int.h"
! 42: #include "sudo_debug.h"
! 43:
! 44: /* Singly linked hook list. */
! 45: struct sudo_hook_list {
! 46: struct sudo_hook_list *next;
! 47: union {
! 48: sudo_hook_fn_t generic_fn;
! 49: sudo_hook_fn_setenv_t setenv_fn;
! 50: sudo_hook_fn_unsetenv_t unsetenv_fn;
! 51: sudo_hook_fn_getenv_t getenv_fn;
! 52: sudo_hook_fn_putenv_t putenv_fn;
! 53: } u;
! 54: void *closure;
! 55: };
! 56:
! 57: /* Each hook type gets own hook list. */
! 58: static struct sudo_hook_list *sudo_hook_setenv_list;
! 59: static struct sudo_hook_list *sudo_hook_unsetenv_list;
! 60: static struct sudo_hook_list *sudo_hook_getenv_list;
! 61: static struct sudo_hook_list *sudo_hook_putenv_list;
! 62:
! 63: int
! 64: process_hooks_setenv(const char *name, const char *value, int overwrite)
! 65: {
! 66: struct sudo_hook_list *hook;
! 67: int rc = SUDO_HOOK_RET_NEXT;
! 68: debug_decl(process_hooks_setenv, SUDO_DEBUG_HOOKS)
! 69:
! 70: /* First process the hooks. */
! 71: for (hook = sudo_hook_setenv_list; hook != NULL; hook = hook->next) {
! 72: rc = hook->u.setenv_fn(name, value, overwrite, hook->closure);
! 73: switch (rc) {
! 74: case SUDO_HOOK_RET_NEXT:
! 75: break;
! 76: case SUDO_HOOK_RET_ERROR:
! 77: case SUDO_HOOK_RET_STOP:
! 78: goto done;
! 79: default:
! 80: warningx("invalid setenv hook return value: %d", rc);
! 81: break;
! 82: }
! 83: }
! 84: done:
! 85: debug_return_int(rc);
! 86: }
! 87:
! 88: int
! 89: process_hooks_putenv(char *string)
! 90: {
! 91: struct sudo_hook_list *hook;
! 92: int rc = SUDO_HOOK_RET_NEXT;
! 93: debug_decl(process_hooks_putenv, SUDO_DEBUG_HOOKS)
! 94:
! 95: /* First process the hooks. */
! 96: for (hook = sudo_hook_putenv_list; hook != NULL; hook = hook->next) {
! 97: rc = hook->u.putenv_fn(string, hook->closure);
! 98: switch (rc) {
! 99: case SUDO_HOOK_RET_NEXT:
! 100: break;
! 101: case SUDO_HOOK_RET_ERROR:
! 102: case SUDO_HOOK_RET_STOP:
! 103: goto done;
! 104: default:
! 105: warningx("invalid putenv hook return value: %d", rc);
! 106: break;
! 107: }
! 108: }
! 109: done:
! 110: debug_return_int(rc);
! 111: }
! 112:
! 113: int
! 114: process_hooks_getenv(const char *name, char **value)
! 115: {
! 116: struct sudo_hook_list *hook;
! 117: char *val = NULL;
! 118: int rc = SUDO_HOOK_RET_NEXT;
! 119: debug_decl(process_hooks_getenv, SUDO_DEBUG_HOOKS)
! 120:
! 121: /* First process the hooks. */
! 122: for (hook = sudo_hook_getenv_list; hook != NULL; hook = hook->next) {
! 123: rc = hook->u.getenv_fn(name, &val, hook->closure);
! 124: switch (rc) {
! 125: case SUDO_HOOK_RET_NEXT:
! 126: break;
! 127: case SUDO_HOOK_RET_ERROR:
! 128: case SUDO_HOOK_RET_STOP:
! 129: goto done;
! 130: default:
! 131: warningx("invalid getenv hook return value: %d", rc);
! 132: break;
! 133: }
! 134: }
! 135: done:
! 136: if (val != NULL)
! 137: *value = val;
! 138: debug_return_int(rc);
! 139: }
! 140:
! 141: int
! 142: process_hooks_unsetenv(const char *name)
! 143: {
! 144: struct sudo_hook_list *hook;
! 145: int rc = SUDO_HOOK_RET_NEXT;
! 146: debug_decl(process_hooks_unsetenv, SUDO_DEBUG_HOOKS)
! 147:
! 148: /* First process the hooks. */
! 149: for (hook = sudo_hook_unsetenv_list; hook != NULL; hook = hook->next) {
! 150: rc = hook->u.unsetenv_fn(name, hook->closure);
! 151: switch (rc) {
! 152: case SUDO_HOOK_RET_NEXT:
! 153: break;
! 154: case SUDO_HOOK_RET_ERROR:
! 155: case SUDO_HOOK_RET_STOP:
! 156: goto done;
! 157: default:
! 158: warningx("invalid unsetenv hook return value: %d", rc);
! 159: break;
! 160: }
! 161: }
! 162: done:
! 163: debug_return_int(rc);
! 164: }
! 165:
! 166: /* Hook registration internals. */
! 167: static void
! 168: register_hook_internal(struct sudo_hook_list **head,
! 169: int (*hook_fn)(), void *closure)
! 170: {
! 171: struct sudo_hook_list *hook;
! 172: debug_decl(register_hook_internal, SUDO_DEBUG_HOOKS)
! 173:
! 174: hook = ecalloc(1, sizeof(*hook));
! 175: hook->u.generic_fn = hook_fn;
! 176: hook->closure = closure;
! 177: hook->next = *head;
! 178: *head = hook;
! 179:
! 180: debug_return;
! 181: }
! 182:
! 183: /* Register the specified hook. */
! 184: int
! 185: register_hook(struct sudo_hook *hook)
! 186: {
! 187: int rval = 0;
! 188: debug_decl(register_hook, SUDO_DEBUG_HOOKS)
! 189:
! 190: if (SUDO_HOOK_VERSION_GET_MAJOR(hook->hook_version) != SUDO_HOOK_VERSION_MAJOR) {
! 191: /* Major versions must match. */
! 192: rval = -1;
! 193: } else {
! 194: switch (hook->hook_type) {
! 195: case SUDO_HOOK_GETENV:
! 196: register_hook_internal(&sudo_hook_getenv_list, hook->hook_fn,
! 197: hook->closure);
! 198: break;
! 199: case SUDO_HOOK_PUTENV:
! 200: register_hook_internal(&sudo_hook_putenv_list, hook->hook_fn,
! 201: hook->closure);
! 202: break;
! 203: case SUDO_HOOK_SETENV:
! 204: register_hook_internal(&sudo_hook_setenv_list, hook->hook_fn,
! 205: hook->closure);
! 206: break;
! 207: case SUDO_HOOK_UNSETENV:
! 208: register_hook_internal(&sudo_hook_unsetenv_list, hook->hook_fn,
! 209: hook->closure);
! 210: break;
! 211: default:
! 212: /* XXX - use define for unknown value */
! 213: rval = 1;
! 214: break;
! 215: }
! 216: }
! 217:
! 218: debug_return_int(rval);
! 219: }
! 220:
! 221: /* Hook deregistration internals. */
! 222: static void
! 223: deregister_hook_internal(struct sudo_hook_list **head,
! 224: int (*hook_fn)(), void *closure)
! 225: {
! 226: struct sudo_hook_list *hook, *prev = NULL;
! 227: debug_decl(deregister_hook_internal, SUDO_DEBUG_HOOKS)
! 228:
! 229: for (hook = *head, prev = NULL; hook != NULL; prev = hook, hook = hook->next) {
! 230: if (hook->u.generic_fn == hook_fn && hook->closure == closure) {
! 231: /* Remove from list and free. */
! 232: if (prev == NULL)
! 233: *head = hook->next;
! 234: else
! 235: prev->next = hook->next;
! 236: efree(hook);
! 237: break;
! 238: }
! 239: }
! 240:
! 241: debug_return;
! 242: }
! 243:
! 244: /* Deregister the specified hook. */
! 245: int
! 246: deregister_hook(struct sudo_hook *hook)
! 247: {
! 248: int rval = 0;
! 249: debug_decl(deregister_hook, SUDO_DEBUG_HOOKS)
! 250:
! 251: if (SUDO_HOOK_VERSION_GET_MAJOR(hook->hook_version) != SUDO_HOOK_VERSION_MAJOR) {
! 252: /* Major versions must match. */
! 253: rval = -1;
! 254: } else {
! 255: switch (hook->hook_type) {
! 256: case SUDO_HOOK_GETENV:
! 257: deregister_hook_internal(&sudo_hook_getenv_list, hook->hook_fn,
! 258: hook->closure);
! 259: break;
! 260: case SUDO_HOOK_PUTENV:
! 261: deregister_hook_internal(&sudo_hook_putenv_list, hook->hook_fn,
! 262: hook->closure);
! 263: break;
! 264: case SUDO_HOOK_SETENV:
! 265: deregister_hook_internal(&sudo_hook_setenv_list, hook->hook_fn,
! 266: hook->closure);
! 267: break;
! 268: case SUDO_HOOK_UNSETENV:
! 269: deregister_hook_internal(&sudo_hook_unsetenv_list, hook->hook_fn,
! 270: hook->closure);
! 271: break;
! 272: default:
! 273: /* XXX - use define for unknown value */
! 274: rval = 1;
! 275: break;
! 276: }
! 277: }
! 278:
! 279: debug_return_int(rval);
! 280: }
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