From f67f83b1facdb6515fb0996fd70d172df37d5962 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Wed, 27 Oct 2004 06:03:28 +0000
Subject: [PATCH] Use strlcpy, not strncpy

svn:r2603
---
 src/common/crypto.c |  3 +--
 src/common/util.c   |  6 +++---
 src/or/dirserv.c    |  4 +---
 src/or/dns.c        | 15 +++++----------
 4 files changed, 10 insertions(+), 18 deletions(-)

diff --git a/src/common/crypto.c b/src/common/crypto.c
index f896b27a58..0ab6d3d3c4 100644
--- a/src/common/crypto.c
+++ b/src/common/crypto.c
@@ -462,8 +462,7 @@ crypto_pk_write_private_key_to_filename(crypto_pk_env_t *env,
   len = BIO_get_mem_data(bio, &cp);
   tor_assert(len >= 0);
   s = tor_malloc(len+1);
-  strncpy(s, cp, len);
-  s[len] = '\0';
+  strlcpy(s, cp, len+1);
   r = write_str_to_file(fname, s, 0);
   BIO_free(bio);
   free(s);
diff --git a/src/common/util.c b/src/common/util.c
index f94088ec9a..4084fe1bb8 100644
--- a/src/common/util.c
+++ b/src/common/util.c
@@ -195,8 +195,7 @@ char *tor_strndup(const char *s, size_t n) {
   char *dup;
   tor_assert(s);
   dup = tor_malloc(n+1);
-  strncpy(dup, s, n);
-  dup[n] = 0;
+  strlcpy(dup, s, n+1);
   return dup;
 }
 
@@ -1770,7 +1769,8 @@ char *expand_filename(const char *filename)
       log_fn(LOG_WARN, "Couldn't find $HOME environment variable while expanding %s", filename);
       return NULL;
     }
-    /* minus two characters for ~/, plus one for /, plus one for NUL. */
+    /* minus two characters for ~/, plus one for /, plus one for NUL.
+     * Round up to 16 in case we can't do math. */
     len = strlen(home)+strlen(filename)+16;
     result = tor_malloc(len);
     snprintf(result,len,"%s/%s",home,filename+2);
diff --git a/src/or/dirserv.c b/src/or/dirserv.c
index d78ab7c45c..f108178464 100644
--- a/src/or/dirserv.c
+++ b/src/or/dirserv.c
@@ -386,9 +386,7 @@ dirserv_add_descriptor(const char **desc)
   ent->nickname = tor_strdup(ri->nickname);
   ent->published = ri->published_on;
   ent->desc_len = desc_len;
-  ent->descriptor = tor_malloc(desc_len+1);
-  strncpy(ent->descriptor, start, desc_len);
-  ent->descriptor[desc_len] = '\0';
+  ent->descriptor = tor_strndup(start,desc_len);
   ent->router = ri;
   /* XXX008 is ent->verified useful/used for anything? */
   ent->verified = verified; /* XXXX008 support other possibilities. */
diff --git a/src/or/dns.c b/src/or/dns.c
index 17bb58c594..b097c1d24a 100644
--- a/src/or/dns.c
+++ b/src/or/dns.c
@@ -201,8 +201,7 @@ int dns_resolve(connection_t *exitconn) {
   purge_expired_resolves(now);
 
   /* now check the tree to see if 'address' is already there. */
-  strncpy(search.address, exitconn->address, MAX_ADDRESSLEN);
-  search.address[MAX_ADDRESSLEN-1] = 0;
+  strlcpy(search.address, exitconn->address, sizeof(search.address));
   resolve = SPLAY_FIND(cache_tree, &cache_root, &search);
   if(resolve) { /* already there */
     switch(resolve->state) {
@@ -237,8 +236,7 @@ int dns_resolve(connection_t *exitconn) {
   resolve = tor_malloc_zero(sizeof(struct cached_resolve));
   resolve->state = CACHE_STATE_PENDING;
   resolve->expire = now + MAX_DNS_ENTRY_AGE;
-  strncpy(resolve->address, exitconn->address, MAX_ADDRESSLEN);
-  resolve->address[MAX_ADDRESSLEN-1] = 0;
+  strlcpy(resolve->address, exitconn->address, sizeof(resolve->address));
 
   /* add us to the pending list */
   pending_connection = tor_malloc_zero(sizeof(struct pending_connection_t));
@@ -306,8 +304,7 @@ void connection_dns_remove(connection_t *conn)
   tor_assert(conn->type == CONN_TYPE_EXIT);
   tor_assert(conn->state == EXIT_CONN_STATE_RESOLVING);
 
-  strncpy(search.address, conn->address, MAX_ADDRESSLEN);
-  search.address[MAX_ADDRESSLEN-1] = 0;
+  strlcpy(search.address, conn->address, sizeof(search.address));
 
   resolve = SPLAY_FIND(cache_tree, &cache_root, &search);
   if(!resolve) {
@@ -383,8 +380,7 @@ void dns_cancel_pending_resolve(char *address) {
   struct cached_resolve *resolve;
   connection_t *pendconn;
 
-  strncpy(search.address, address, MAX_ADDRESSLEN);
-  search.address[MAX_ADDRESSLEN-1] = 0;
+  strlcpy(search.address, address, sizeof(search.address));
 
   resolve = SPLAY_FIND(cache_tree, &cache_root, &search);
   if(!resolve) {
@@ -454,8 +450,7 @@ static void dns_found_answer(char *address, uint32_t addr, char outcome) {
   connection_t *pendconn;
   circuit_t *circ;
 
-  strncpy(search.address, address, MAX_ADDRESSLEN);
-  search.address[MAX_ADDRESSLEN-1] = 0;
+  strlcpy(search.address, address, sizeof(search.address));
 
   resolve = SPLAY_FIND(cache_tree, &cache_root, &search);
   if(!resolve) {