X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=secnet.git;a=blobdiff_plain;f=util.c;h=fff5b6d13e5e0f74544723ea4ff9e8f9013634f5;hp=d2a3e98b76e7692e948a08c9bd3598823ec35ffe;hb=45cfab8ca7db61ce4677e2e77e76b9266c57ab12;hpb=040ee979539e88ef71fb21a80d4a05d24961ae70

diff --git a/util.c b/util.c
index d2a3e98..fff5b6d 100644
--- a/util.c
+++ b/util.c
@@ -74,6 +74,12 @@ void *safe_malloc(size_t size, const char *message)
     }
     return r;
 }
+void *safe_malloc_ary(size_t size, size_t count, const char *message) {
+    if (count >= INT_MAX/size) {
+	fatal("array allocation overflow: %s", message);
+    }
+    return safe_malloc(size*count, message);
+}
 
 /* Convert a buffer into its MP_INT representation */
 void read_mpbin(MP_INT *a, uint8_t *bin, int binsize)
@@ -133,7 +139,7 @@ static uint8_t hexval(uint8_t c)
 }
 
 /* Convert a MP_INT into a buffer; return length; truncate if necessary */
-uint32_t write_mpbin(MP_INT *a, uint8_t *buffer, uint32_t buflen)
+int32_t write_mpbin(MP_INT *a, uint8_t *buffer, int32_t buflen)
 {
     char *hb;
     int i,j,l;
@@ -198,12 +204,17 @@ bool_t remove_hook(uint32_t phase, hook_fn *fn, void *state)
     return False;
 }
 
+void vslilog(struct log_if *lf, int priority, const char *message, va_list ap)
+{
+    lf->vlog(lf->st,priority,message,ap);
+}
+
 void slilog(struct log_if *lf, int priority, const char *message, ...)
 {
     va_list ap;
     
     va_start(ap,message);
-    lf->vlog(lf->st,priority,message,ap);
+    vslilog(lf,priority,message,ap);
     va_end(ap);
 }
 
@@ -213,7 +224,7 @@ struct buffer {
 };
 
 void buffer_assert_free(struct buffer_if *buffer, cstring_t file,
-			uint32_t line)
+			int line)
 {
     if (!buffer->free) {
 	fatal("BUF_ASSERT_FREE, %s line %d, owned by %s",
@@ -222,7 +233,7 @@ void buffer_assert_free(struct buffer_if *buffer, cstring_t file,
 }
 
 void buffer_assert_used(struct buffer_if *buffer, cstring_t file,
-			uint32_t line)
+			int line)
 {
     if (buffer->free) {
 	fatal("BUF_ASSERT_USED, %s line %d, last owned by %s",
@@ -230,30 +241,32 @@ void buffer_assert_used(struct buffer_if *buffer, cstring_t file,
     }
 }
 
-void buffer_init(struct buffer_if *buffer, uint32_t max_start_pad)
+void buffer_init(struct buffer_if *buffer, int32_t max_start_pad)
 {
     buffer->start=buffer->base+max_start_pad;
     buffer->size=0;
 }
 
-void *buf_append(struct buffer_if *buf, uint32_t amount) {
+void *buf_append(struct buffer_if *buf, int32_t amount) {
     void *p;
+    assert(buf->size <= buf->len - amount);
     p=buf->start + buf->size;
     buf->size+=amount;
     return p;
 }
 
-void *buf_prepend(struct buffer_if *buf, uint32_t amount) {
+void *buf_prepend(struct buffer_if *buf, int32_t amount) {
+    assert(amount <= buf->start - buf->base);
     buf->size+=amount;
     return buf->start-=amount;
 }
 
-void *buf_unappend(struct buffer_if *buf, uint32_t amount) {
+void *buf_unappend(struct buffer_if *buf, int32_t amount) {
     if (buf->size < amount) return 0;
     return buf->start+(buf->size-=amount);
 }
 
-void *buf_unprepend(struct buffer_if *buf, uint32_t amount) {
+void *buf_unprepend(struct buffer_if *buf, int32_t amount) {
     void *p;
     p=buf->start;
     buf->start+=amount;
@@ -265,14 +278,15 @@ void *buf_unprepend(struct buffer_if *buf, uint32_t amount) {
    network byte order. */
 void buf_append_string(struct buffer_if *buf, cstring_t s)
 {
-    uint16_t len;
+    size_t len;
 
     len=strlen(s);
+    /* fixme: if string is longer than 65535, result is a corrupted packet */
     buf_append_uint16(buf,len);
     memcpy(buf_append(buf,len),s,len);
 }
 
-void buffer_new(struct buffer_if *buf, uint32_t len)
+void buffer_new(struct buffer_if *buf, int32_t len)
 {
     buf->free=True;
     buf->owner=NULL;
@@ -335,7 +349,6 @@ static list_t *buffer_apply(closure_t *self, struct cloc loc, dict_t *context,
     return new_closure(&st->cl);
 }
 
-init_module util_module;
 void util_module(dict_t *dict)
 {
     add_closure(dict,"sysbuffer",buffer_apply);