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authorDamien Miller <djm@mindrot.org>1999-12-30 01:29:35 +1100
committerDamien Miller <djm@mindrot.org>1999-12-30 01:29:35 +1100
commit753331ee5e0a61adf6cf26ae0e75606a3e68947a (patch)
treeec939470e51501a9652d52516cda19f7751882c6 /bsd-misc.c
parent58ca7d8503b4e6346bed0844a6ab94a9a4f2b1ec (diff)
- Rename helper.[ch] to (more appropriate) bsd-misc.[ch]
Diffstat (limited to 'bsd-misc.c')
-rw-r--r--bsd-misc.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/bsd-misc.c b/bsd-misc.c
new file mode 100644
index 00000000..c952fd0f
--- /dev/null
+++ b/bsd-misc.c
@@ -0,0 +1,214 @@
+/*
+**
+** OpenBSD emulation routines
+**
+** Damien Miller <djm@ibs.com.au>
+**
+** Copyright 1999 Internet Business Solutions
+**
+** Permission is hereby granted, free of charge, to any person
+** obtaining a copy of this software and associated documentation
+** files (the "Software"), to deal in the Software without
+** restriction, including without limitation the rights to use, copy,
+** modify, merge, publish, distribute, sublicense, and/or sell copies
+** of the Software, and to permit persons to whom the Software is
+** furnished to do so, subject to the following conditions:
+**
+** The above copyright notice and this permission notice shall be
+** included in all copies or substantial portions of the Software.
+**
+** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+** KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+** WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+** AND NONINFRINGEMENT. IN NO EVENT SHALL DAMIEN MILLER OR INTERNET
+** BUSINESS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
+** OR OTHER DEALINGS IN THE SOFTWARE.
+**
+** Except as contained in this notice, the name of Internet Business
+** Solutions shall not be used in advertising or otherwise to promote
+** the sale, use or other dealings in this Software without prior
+** written authorization from Internet Business Solutions.
+**
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <fcntl.h>
+
+#include "xmalloc.h"
+#include "ssh.h"
+#include "config.h"
+#include "bsd-misc.h"
+
+#ifndef offsetof
+#define offsetof(type, member) ((size_t) &((type *)0)->member)
+#endif
+
+#ifndef HAVE_ARC4RANDOM
+
+typedef struct
+{
+ unsigned int s[256];
+ int i;
+ int j;
+} rc4_t;
+
+void get_random_bytes(unsigned char *buf, int len);
+void rc4_key(rc4_t *r, unsigned char *key, int len);
+void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len);
+
+static rc4_t *rc4 = NULL;
+
+void rc4_key(rc4_t *r, unsigned char *key, int len)
+{
+ int t;
+
+ for(r->i = 0; r->i < 256; r->i++)
+ r->s[r->i] = r->i;
+
+ r->j = 0;
+ for(r->i = 0; r->i < 256; r->i++)
+ {
+ r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256;
+ t = r->s[r->i];
+ r->s[r->i] = r->s[r->j];
+ r->s[r->j] = t;
+ }
+ r->i = r->j = 0;
+}
+
+void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len)
+{
+ int t;
+ int c;
+
+ c = 0;
+ while(c < len)
+ {
+ r->i = (r->i + 1) % 256;
+ r->j = (r->j + r->s[r->i]) % 256;
+ t = r->s[r->i];
+ r->s[r->i] = r->s[r->j];
+ r->s[r->j] = t;
+
+ t = (r->s[r->i] + r->s[r->j]) % 256;
+
+ buffer[c] = r->s[t];
+ c++;
+ }
+}
+
+unsigned int arc4random(void)
+{
+ unsigned int r;
+
+ if (rc4 == NULL)
+ arc4random_stir();
+
+ rc4_getbytes(rc4, (unsigned char *)&r, sizeof(r));
+
+ return(r);
+}
+
+void arc4random_stir(void)
+{
+ unsigned char rand_buf[32];
+
+ if (rc4 == NULL)
+ rc4 = xmalloc(sizeof(*rc4));
+
+ get_random_bytes(rand_buf, sizeof(rand_buf));
+ rc4_key(rc4, rand_buf, sizeof(rand_buf));
+}
+
+void get_random_bytes(unsigned char *buf, int len)
+{
+ static int random_pool;
+ int c;
+#ifdef HAVE_EGD
+ char egd_message[2] = { 0x02, 0x00 };
+ struct sockaddr_un addr;
+ int addr_len;
+
+ memset(&addr, '\0', sizeof(addr));
+ addr.sun_family = AF_UNIX;
+
+ /* FIXME: compile time check? */
+ if (sizeof(RANDOM_POOL) > sizeof(addr.sun_path))
+ fatal("Random pool path is too long");
+
+ strcpy(addr.sun_path, RANDOM_POOL);
+
+ addr_len = offsetof(struct sockaddr_un, sun_path) + sizeof(RANDOM_POOL);
+
+ random_pool = socket(AF_UNIX, SOCK_STREAM, 0);
+
+ if (random_pool == -1)
+ fatal("Couldn't create AF_UNIX socket: %s", strerror(errno));
+
+ if (connect(random_pool, (struct sockaddr*)&addr, addr_len) == -1)
+ fatal("Couldn't connect to EGD socket \"%s\": %s", addr.sun_path, strerror(errno));
+
+ if (len > 255)
+ fatal("Too many bytes to read from EGD");
+
+ /* Send blocking read request to EGD */
+ egd_message[1] = len;
+
+ c = atomicio(write, random_pool, egd_message, sizeof(egd_message));
+ if (c == -1)
+ fatal("Couldn't write to EGD socket \"%s\": %s", RANDOM_POOL, strerror(errno));
+
+#else /* HAVE_EGD */
+
+ random_pool = open(RANDOM_POOL, O_RDONLY);
+ if (random_pool == -1)
+ fatal("Couldn't open random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
+
+#endif /* HAVE_EGD */
+
+ c = atomicio(read, random_pool, buf, len);
+ if (c <= 0)
+ fatal("Couldn't read from random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
+
+ close(random_pool);
+}
+#endif /* !HAVE_ARC4RANDOM */
+
+#ifndef HAVE_SETPROCTITLE
+void setproctitle(const char *fmt, ...)
+{
+ /* FIXME */
+}
+#endif /* !HAVE_SETPROCTITLE */
+
+#ifndef HAVE_SETENV
+int setenv(const char *name, const char *value, int overwrite)
+{
+ char *env_string;
+ int result;
+
+ /* Don't overwrite existing env. var if overwrite is 0 */
+ if (!overwrite && (getenv(name) != NULL))
+ return(0);
+
+ env_string = xmalloc(strlen(name) + strlen(value) + 2);
+ sprintf(env_string, "%s=%s", name, value);
+
+ result = putenv(env_string);
+
+ xfree(env_string);
+
+ return(result);
+}
+#endif /* !HAVE_SETENV */