3 ** OpenBSD emulation routines
5 ** Damien Miller <djm@ibs.com.au>
7 ** Copyright 1999 Internet Business Solutions
9 ** Permission is hereby granted, free of charge, to any person
10 ** obtaining a copy of this software and associated documentation
11 ** files (the "Software"), to deal in the Software without
12 ** restriction, including without limitation the rights to use, copy,
13 ** modify, merge, publish, distribute, sublicense, and/or sell copies
14 ** of the Software, and to permit persons to whom the Software is
15 ** furnished to do so, subject to the following conditions:
17 ** The above copyright notice and this permission notice shall be
18 ** included in all copies or substantial portions of the Software.
20 ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
21 ** KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
22 ** WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
23 ** AND NONINFRINGEMENT. IN NO EVENT SHALL DAMIEN MILLER OR INTERNET
24 ** BUSINESS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 ** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
26 ** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
27 ** OR OTHER DEALINGS IN THE SOFTWARE.
29 ** Except as contained in this notice, the name of Internet Business
30 ** Solutions shall not be used in advertising or otherwise to promote
31 ** the sale, use or other dealings in this Software without prior
32 ** written authorization from Internet Business Solutions.
44 #include <sys/types.h>
46 #include <sys/socket.h>
55 #define offsetof(type, member) ((size_t) &((type *)0)->member)
58 #ifndef HAVE_ARC4RANDOM
67 void get_random_bytes(unsigned char *buf, int len);
68 void rc4_key(rc4_t *r, unsigned char *key, int len);
69 void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len);
71 static rc4_t *rc4 = NULL;
73 void rc4_key(rc4_t *r, unsigned char *key, int len)
77 for(r->i = 0; r->i < 256; r->i++)
81 for(r->i = 0; r->i < 256; r->i++)
83 r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256;
85 r->s[r->i] = r->s[r->j];
91 void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len)
99 r->i = (r->i + 1) % 256;
100 r->j = (r->j + r->s[r->i]) % 256;
102 r->s[r->i] = r->s[r->j];
105 t = (r->s[r->i] + r->s[r->j]) % 256;
112 unsigned int arc4random(void)
119 rc4_getbytes(rc4, (unsigned char *)&r, sizeof(r));
124 void arc4random_stir(void)
126 unsigned char rand_buf[32];
129 rc4 = xmalloc(sizeof(*rc4));
131 get_random_bytes(rand_buf, sizeof(rand_buf));
132 rc4_key(rc4, rand_buf, sizeof(rand_buf));
135 void get_random_bytes(unsigned char *buf, int len)
137 static int random_pool;
140 char egd_message[2] = { 0x02, 0x00 };
141 struct sockaddr_un addr;
144 memset(&addr, '\0', sizeof(addr));
145 addr.sun_family = AF_UNIX;
147 /* FIXME: compile time check? */
148 if (sizeof(RANDOM_POOL) > sizeof(addr.sun_path))
149 fatal("Random pool path is too long");
151 strcpy(addr.sun_path, RANDOM_POOL);
153 addr_len = offsetof(struct sockaddr_un, sun_path) + sizeof(RANDOM_POOL);
155 random_pool = socket(AF_UNIX, SOCK_STREAM, 0);
157 if (random_pool == -1)
158 fatal("Couldn't create AF_UNIX socket: %s", strerror(errno));
160 if (connect(random_pool, (struct sockaddr*)&addr, addr_len) == -1)
161 fatal("Couldn't connect to EGD socket \"%s\": %s", addr.sun_path, strerror(errno));
164 fatal("Too many bytes to read from EGD");
166 /* Send blocking read request to EGD */
167 egd_message[1] = len;
169 c = atomicio(write, random_pool, egd_message, sizeof(egd_message));
171 fatal("Couldn't write to EGD socket \"%s\": %s", RANDOM_POOL, strerror(errno));
175 random_pool = open(RANDOM_POOL, O_RDONLY);
176 if (random_pool == -1)
177 fatal("Couldn't open random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
179 #endif /* HAVE_EGD */
181 c = atomicio(read, random_pool, buf, len);
183 fatal("Couldn't read from random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
187 #endif /* !HAVE_ARC4RANDOM */
189 #ifndef HAVE_SETPROCTITLE
190 void setproctitle(const char *fmt, ...)
194 #endif /* !HAVE_SETPROCTITLE */
197 int setenv(const char *name, const char *value, int overwrite)
202 /* Don't overwrite existing env. var if overwrite is 0 */
203 if (!overwrite && (getenv(name) != NULL))
206 env_string = xmalloc(strlen(name) + strlen(value) + 2);
207 sprintf(env_string, "%s=%s", name, value);
209 result = putenv(env_string);
215 #endif /* !HAVE_SETENV */
217 #ifndef HAVE_SETLOGIN
218 int setlogin(const char *name)
222 #endif /* !HAVE_SETLOGIN */
225 int innetgr(const char *netgroup, const char *host,
226 const char *user, const char *domain)
230 #endif /* HAVE_INNETGR */
232 #if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
233 int seteuid(uid_t euid)
235 return(setreuid(-1,euid));
237 #endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */