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.
42 #include <sys/types.h>
44 #include <sys/socket.h>
54 #define offsetof(type, member) ((size_t) &((type *)0)->member)
57 #ifndef HAVE_ARC4RANDOM
66 void get_random_bytes(unsigned char *buf, int len);
67 void rc4_key(rc4_t *r, unsigned char *key, int len);
68 void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len);
70 static rc4_t *rc4 = NULL;
72 void rc4_key(rc4_t *r, unsigned char *key, int len)
76 for(r->i = 0; r->i < 256; r->i++)
80 for(r->i = 0; r->i < 256; r->i++)
82 r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256;
84 r->s[r->i] = r->s[r->j];
90 void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len)
98 r->i = (r->i + 1) % 256;
99 r->j = (r->j + r->s[r->i]) % 256;
101 r->s[r->i] = r->s[r->j];
104 t = (r->s[r->i] + r->s[r->j]) % 256;
111 unsigned int arc4random(void)
118 rc4_getbytes(rc4, (unsigned char *)&r, sizeof(r));
123 void arc4random_stir(void)
125 unsigned char rand_buf[32];
128 rc4 = xmalloc(sizeof(*rc4));
130 get_random_bytes(rand_buf, sizeof(rand_buf));
131 rc4_key(rc4, rand_buf, sizeof(rand_buf));
134 void get_random_bytes(unsigned char *buf, int len)
136 static int random_pool;
139 char egd_message[2] = { 0x02, 0x00 };
140 struct sockaddr_un addr;
143 memset(&addr, '\0', sizeof(addr));
144 addr.sun_family = AF_UNIX;
146 /* FIXME: compile time check? */
147 if (sizeof(RANDOM_POOL) > sizeof(addr.sun_path))
148 fatal("Random pool path is too long");
150 strcpy(addr.sun_path, RANDOM_POOL);
152 addr_len = offsetof(struct sockaddr_un, sun_path) + sizeof(RANDOM_POOL);
154 random_pool = socket(AF_UNIX, SOCK_STREAM, 0);
156 if (random_pool == -1)
157 fatal("Couldn't create AF_UNIX socket: %s", strerror(errno));
159 if (connect(random_pool, (struct sockaddr*)&addr, addr_len) == -1)
160 fatal("Couldn't connect to EGD socket \"%s\": %s", addr.sun_path, strerror(errno));
163 fatal("Too many bytes to read from EGD");
165 /* Send blocking read request to EGD */
166 egd_message[1] = len;
168 c = atomicio(write, random_pool, egd_message, sizeof(egd_message));
170 fatal("Couldn't write to EGD socket \"%s\": %s", RANDOM_POOL, strerror(errno));
174 random_pool = open(RANDOM_POOL, O_RDONLY);
175 if (random_pool == -1)
176 fatal("Couldn't open random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
178 #endif /* HAVE_EGD */
180 c = atomicio(read, random_pool, buf, len);
182 fatal("Couldn't read from random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
186 #endif /* !HAVE_ARC4RANDOM */
188 #ifndef HAVE_SETPROCTITLE
189 void setproctitle(const char *fmt, ...)
193 #endif /* !HAVE_SETPROCTITLE */
196 int setenv(const char *name, const char *value, int overwrite)
201 /* Don't overwrite existing env. var if overwrite is 0 */
202 if (!overwrite && (getenv(name) != NULL))
205 env_string = xmalloc(strlen(name) + strlen(value) + 2);
206 sprintf(env_string, "%s=%s", name, value);
208 result = putenv(env_string);
214 #endif /* !HAVE_SETENV */
216 #ifndef HAVE_SETLOGIN
217 int setlogin(const char *name)
221 #endif /* !HAVE_SETLOGIN */
224 int innetgr(const char *netgroup, const char *host,
225 const char *user, const char *domain)
229 #endif /* HAVE_INNETGR */
231 #if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
232 int seteuid(uid_t euid)
234 return(setreuid(-1,euid));
236 #endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */