X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;ds=sidebyside;f=util.c;h=4982c93c58e6ae84fa0d8edc1eefedd59156862a;hb=ee43fb13660683cdbcebd2c58faf7a067cb26745;hp=6742dad52de4d000b3b2476040c1dd2cca148aaa;hpb=887c6ac76e2435cdbb89f3e0df423fac75ec373c;p=secnet.git

diff --git a/util.c b/util.c
index 6742dad..4982c93 100644
--- a/util.c
+++ b/util.c
@@ -6,26 +6,22 @@
  * - MPI convenience functions
  */
 /*
- *  This file is
- *    Copyright (C) 1995--2001 Stephen Early <steve@greenend.org.uk>
+ * This file is part of secnet.
+ * See README for full list of copyright holders.
  *
- *  It is part of secnet, which is
- *    Copyright (C) 1995--2001 Stephen Early <steve@greenend.org.uk>
- *    Copyright (C) 1998 Ross Anderson, Eli Biham, Lars Knudsen
- *  
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2, or (at your option)
- *  any later version.
- *  
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *  
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software Foundation,
- *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
+ * secnet is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * secnet is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * version 3 along with secnet; if not, see
+ * https://www.gnu.org/licenses/gpl.html.
  */
 
 #include "secnet.h"
@@ -97,31 +93,23 @@ void *safe_malloc_ary(size_t size, size_t count, const char *message) {
     return safe_realloc_ary(0,size,count,message);
 }
 
-/* Convert a buffer into its MP_INT representation */
-void read_mpbin(MP_INT *a, uint8_t *bin, int binsize)
+void hex_encode(const uint8_t *bin, int binsize, char *buff)
 {
-    char *buff;
     int i;
 
-    buff=safe_malloc(binsize*2 + 1,"read_mpbin");
-
     for (i=0; i<binsize; i++) {
 	buff[i*2]=hexdigits[(bin[i] & 0xf0) >> 4];
 	buff[i*2+1]=hexdigits[(bin[i] & 0xf)];
     }
     buff[binsize*2]=0;
-
-    mpz_set_str(a, buff, 16);
-    free(buff);
 }
 
-/* Convert a MP_INT into a hex string */
-char *write_mpstring(MP_INT *a)
+string_t hex_encode_alloc(const uint8_t *bin, int binsize)
 {
     char *buff;
 
-    buff=safe_malloc(mpz_sizeinbase(a,16)+2,"write_mpstring");
-    mpz_get_str(buff, 16, a);
+    buff=safe_malloc(hex_encode_size(binsize),"hex_encode");
+    hex_encode(bin,binsize,buff);
     return buff;
 }
 
@@ -154,27 +142,54 @@ static uint8_t hexval(uint8_t c)
     return -1;
 }
 
-/* Convert a MP_INT into a buffer; return length; truncate if necessary */
-int32_t write_mpbin(MP_INT *a, uint8_t *buffer, int32_t buflen)
+bool_t hex_decode(uint8_t *buffer, int32_t buflen, int32_t *outlen,
+		  cstring_t hb, bool_t allow_odd_nibble)
 {
-    char *hb;
-    int i,j,l;
-    
-    if (buflen==0) return 0;
-    hb=write_mpstring(a);
-    
-    l=strlen(hb);
-    i=0; j=0;
+    int i = 0, j = 0, l = strlen(hb), hi, lo;
+    bool_t ok = False;
+
+    if (!l || !buflen) { ok = !l; goto done; }
     if (l&1) {
 	/* The number starts with a half-byte */
-	buffer[i++]=hexval(hb[j++]);
+	if (!allow_odd_nibble) goto done;
+	lo = hexval(hb[j++]); if (lo < 0) goto done;
+	buffer[i++] = lo;
     }
-    for (; hb[j] && i<buflen; i++) {
-	buffer[i]=(hexval(hb[j])<<4)|hexval(hb[j+1]);
-	j+=2;
+    for (; hb[j] && i < buflen; i++) {
+	hi = hexval(hb[j++]);
+	lo = hexval(hb[j++]);
+	if (hi < 0 || lo < 0) goto done;
+	buffer[i] = (hi << 4) | lo;
     }
+    ok = !hb[j];
+done:
+    *outlen = i;
+    return ok;
+}
+
+void read_mpbin(MP_INT *a, uint8_t *bin, int binsize)
+{
+    char *buff = hex_encode_alloc(bin, binsize);
+    mpz_set_str(a, buff, 16);
+    free(buff);
+}
+
+char *write_mpstring(MP_INT *a)
+{
+    char *buff;
+
+    buff=safe_malloc(mpz_sizeinbase(a,16)+2,"write_mpstring");
+    mpz_get_str(buff, 16, a);
+    return buff;
+}
+
+int32_t write_mpbin(MP_INT *a, uint8_t *buffer, int32_t buflen)
+{
+    char *hb = write_mpstring(a);
+    int32_t len;
+    hex_decode(buffer, buflen, &len, hb, True);
     free(hb);
-    return i;
+    return len;
 }
 
 #define DEFINE_SETFDFLAG(fn,FL,FLAG)					\
@@ -336,8 +351,6 @@ void *buf_unprepend(struct buffer_if *buf, int32_t amount) {
     return p;
 }
 
-/* Append a two-byte length and the string to the buffer. Length is in
-   network byte order. */
 void buf_append_string(struct buffer_if *buf, cstring_t s)
 {
     size_t len;
@@ -452,7 +465,7 @@ void send_nak(const struct comm_addr *dest, uint32_t our_index,
 		" %s; sending NAK\n",
 		comm_addr_to_string(dest),
 		our_index, their_index, msgtype, logwhy);
-    dest->comm->sendmsg(dest->comm->st, buf, dest);
+    dest->comm->sendmsg(dest->comm->st, buf, dest, 0);
 }
 
 int consttime_memeq(const void *s1in, const void *s2in, size_t n)
@@ -471,6 +484,14 @@ int consttime_memeq(const void *s1in, const void *s2in, size_t n)
     return accumulator;
 }
 
+void hash_hash(const struct hash_if *hashi, const void *msg, int32_t len,
+	       uint8_t *digest) {
+    uint8_t hst[hashi->slen];
+    hashi->init(hst);
+    hashi->update(hst,msg,len);
+    hashi->final(hst,digest);
+}
+
 void util_module(dict_t *dict)
 {
     add_closure(dict,"sysbuffer",buffer_apply);
@@ -525,7 +546,7 @@ void string_item_to_iaddr(const item_t *item, uint16_t port, union iaddr *ia,
 #ifndef CONFIG_IPV6
 
     ia->sin.sin_family=AF_INET;
-    ia->sin.sin_addr.s_addr=string_item_to_ipaddr(item,desc);
+    ia->sin.sin_addr.s_addr=htonl(string_item_to_ipaddr(item,desc));
     ia->sin.sin_port=htons(port);
 
 #else /* CONFIG_IPV6 => we have adns_text2addr */