3 ** OpenBSD emulation routines
5 ** Damien Miller <djm@ibs.com.au>
7 ** Copyright 1999 Damien Miller
8 ** Copyright 1999 Internet Business Solutions
10 ** Permission is hereby granted, free of charge, to any person
11 ** obtaining a copy of this software and associated documentation
12 ** files (the "Software"), to deal in the Software without
13 ** restriction, including without limitation the rights to use, copy,
14 ** modify, merge, publish, distribute, sublicense, and/or sell copies
15 ** of the Software, and to permit persons to whom the Software is
16 ** furnished to do so, subject to the following conditions:
18 ** The above copyright notice and this permission notice shall be
19 ** included in all copies or substantial portions of the Software.
21 ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
22 ** KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
23 ** WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
24 ** AND NONINFRINGEMENT. IN NO EVENT SHALL DAMIEN MILLER OR INTERNET
25 ** BUSINESS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 ** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27 ** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
28 ** OR OTHER DEALINGS IN THE SOFTWARE.
30 ** Except as contained in this notice, the name of Internet Business
31 ** Solutions shall not be used in advertising or otherwise to promote
32 ** the sale, use or other dealings in this Software without prior
33 ** written authorization from Internet Business Solutions.
45 #include <sys/types.h>
47 #include <sys/socket.h>
59 #define offsetof(type, member) ((size_t) &((type *)0)->member)
62 #ifndef HAVE_ARC4RANDOM
71 void get_random_bytes(unsigned char *buf, int len);
72 void rc4_key(rc4_t *r, unsigned char *key, int len);
73 void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len);
75 static rc4_t *rc4 = NULL;
77 void rc4_key(rc4_t *r, unsigned char *key, int len)
81 for(r->i = 0; r->i < 256; r->i++)
85 for(r->i = 0; r->i < 256; r->i++)
87 r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256;
89 r->s[r->i] = r->s[r->j];
95 void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len)
103 r->i = (r->i + 1) % 256;
104 r->j = (r->j + r->s[r->i]) % 256;
106 r->s[r->i] = r->s[r->j];
109 t = (r->s[r->i] + r->s[r->j]) % 256;
116 unsigned int arc4random(void)
123 rc4_getbytes(rc4, (unsigned char *)&r, sizeof(r));
128 void arc4random_stir(void)
130 unsigned char rand_buf[32];
133 rc4 = xmalloc(sizeof(*rc4));
135 get_random_bytes(rand_buf, sizeof(rand_buf));
136 rc4_key(rc4, rand_buf, sizeof(rand_buf));
139 void get_random_bytes(unsigned char *buf, int len)
141 static int random_pool;
144 char egd_message[2] = { 0x02, 0x00 };
145 struct sockaddr_un addr;
148 memset(&addr, '\0', sizeof(addr));
149 addr.sun_family = AF_UNIX;
151 /* FIXME: compile time check? */
152 if (sizeof(RANDOM_POOL) > sizeof(addr.sun_path))
153 fatal("Random pool path is too long");
155 strcpy(addr.sun_path, RANDOM_POOL);
157 addr_len = offsetof(struct sockaddr_un, sun_path) + sizeof(RANDOM_POOL);
159 random_pool = socket(AF_UNIX, SOCK_STREAM, 0);
161 if (random_pool == -1)
162 fatal("Couldn't create AF_UNIX socket: %s", strerror(errno));
164 if (connect(random_pool, (struct sockaddr*)&addr, addr_len) == -1)
165 fatal("Couldn't connect to EGD socket \"%s\": %s", addr.sun_path, strerror(errno));
168 fatal("Too many bytes to read from EGD");
170 /* Send blocking read request to EGD */
171 egd_message[1] = len;
173 c = atomicio(write, random_pool, egd_message, sizeof(egd_message));
175 fatal("Couldn't write to EGD socket \"%s\": %s", RANDOM_POOL, strerror(errno));
179 random_pool = open(RANDOM_POOL, O_RDONLY);
180 if (random_pool == -1)
181 fatal("Couldn't open random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
183 #endif /* HAVE_EGD */
185 c = atomicio(read, random_pool, buf, len);
187 fatal("Couldn't read from random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
191 #endif /* !HAVE_ARC4RANDOM */
193 #ifndef HAVE_SETPROCTITLE
194 void setproctitle(const char *fmt, ...)
198 #endif /* !HAVE_SETPROCTITLE */
201 int setenv(const char *name, const char *value, int overwrite)
206 /* Don't overwrite existing env. var if overwrite is 0 */
207 if (!overwrite && (getenv(name) != NULL))
210 env_string = xmalloc(strlen(name) + strlen(value) + 2);
211 sprintf(env_string, "%s=%s", name, value);
213 result = putenv(env_string);
219 #endif /* !HAVE_SETENV */
221 #ifndef HAVE_SETLOGIN
222 int setlogin(const char *name)
226 #endif /* !HAVE_SETLOGIN */
229 int innetgr(const char *netgroup, const char *host,
230 const char *user, const char *domain)
234 #endif /* HAVE_INNETGR */
236 #if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
237 int seteuid(uid_t euid)
239 return(setreuid(-1,euid));
241 #endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */