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authorDan Winship <danw@src.gnome.org>2000-11-28 11:26:51 +0800
committerDan Winship <danw@src.gnome.org>2000-11-28 11:26:51 +0800
commit89ae418e500b8503bd8edddb60c5a429539404ee (patch)
tree27fe3048b93d9850670c85acb94aeeabb4e91cc9 /camel/providers/imap
parent26fccb498293b89b9bef804fc85436e00a4ee1cd (diff)
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Make this gratuitously more complicated. No wait, I mean, fix bugs. Now
* providers/imap/camel-imap-command.c (imap_read_untagged): Make this gratuitously more complicated. No wait, I mean, fix bugs. Now fully handles NULs in the data stream (which "can't happen" but do) and also handles responses containing multiple literals. Also does less copying than the original code. * camel-stream-buffer.c (stream_read): Fix a bug that could make it lose sync and/or overrun buffers. svn path=/trunk/; revision=6688
Diffstat (limited to 'camel/providers/imap')
-rw-r--r--camel/providers/imap/camel-imap-command.c137
1 files changed, 89 insertions, 48 deletions
diff --git a/camel/providers/imap/camel-imap-command.c b/camel/providers/imap/camel-imap-command.c
index e615453198..4f2b0ca500 100644
--- a/camel/providers/imap/camel-imap-command.c
+++ b/camel/providers/imap/camel-imap-command.c
@@ -228,78 +228,119 @@ imap_read_response (CamelImapStore *store, CamelException *ex)
}
/* Given a line that is the start of an untagged response, read and
- * return the complete response. (This will be a no-op if the line
- * in question doesn't end with a literal.)
- *
- * FIXME: this won't deal with multiple literals in a single response.
+ * return the complete response, which may include an arbitrary number
+ * of literals.
*/
static char *
imap_read_untagged (CamelImapStore *store, char *line, CamelException *ex)
{
- int fulllen, length, left, i;
+ int fulllen, length, ldigits, nread, i;
GPtrArray *data;
- char *end, *p;
- int n;
+ GString *str;
+ char *end, *p, *s, *d;
p = strrchr (line, '{');
if (!p)
return line;
- length = strtoul (p + 1, &end, 10);
- if (*end != '}' || *(end + 1) || end == p + 1)
- return line;
-
- fulllen = length + strlen (line) + 1;
-
- /* OK. We have a literal. @length is the length including CRLF
- * pairs, which camel_remote_store_recv_line won't return.
- */
data = g_ptr_array_new ();
- g_ptr_array_add (data, line);
- left = length;
+ fulllen = 0;
+
while (1) {
- if ((n = camel_remote_store_recv_line (CAMEL_REMOTE_STORE (store), &line, ex)) < 0) {
- for (i = 0; i < data->len; i++)
- g_free (data->pdata[i]);
- g_ptr_array_free (data, TRUE);
- return NULL;
- }
- g_ptr_array_add (data, line);
+ str = g_string_new (line);
+ g_free (line);
+ fulllen += str->len;
+ g_ptr_array_add (data, str);
- if (left <= 0)
+ p = strrchr (str->str, '{');
+ if (!p)
break;
-
- left -= n + 2;
-
- /* The output string will have only LF, not CRLF, so
- * decrement the length by one.
+
+ length = strtoul (p + 1, &end, 10);
+ if (*end != '}' || *(end + 1) || end == p + 1)
+ break;
+ ldigits = end - (p + 1);
+
+ /* Read the literal */
+ str = g_string_sized_new (length + 2);
+ str->str[0] = '\n';
+ nread = camel_stream_read (CAMEL_REMOTE_STORE (store)->istream,
+ str->str + 1, length);
+ if (nread < length) {
+ camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
+ _("Server response ended too soon."));
+ camel_service_disconnect (CAMEL_SERVICE (store),
+ FALSE, NULL);
+ goto lose;
+ }
+ str->str[length] = '\0';
+
+ /* Fix up the literal, turning CRLFs into LF. Also, if
+ * we find any embedded NULs, strip them. This is
+ * dubious, but:
+ * - The IMAP grammar says you can't have NULs here
+ * anyway, so this will not affect our behavior
+ * against any completely correct server.
+ * - WU-imapd 12.264 (at least) will cheerily pass
+ * NULs along if they are embedded in the message
+ * - The only cause of embedded NULs we've seen is an
+ * Evolution base64-encoder bug that sometimes
+ * inserts a NUL into the last line when it
+ * shouldn't.
+ */
+
+ s = d = str->str + 1;
+ end = str->str + 1 + length;
+ while (s < end) {
+ while (*s == '\0' && s < end) {
+ s++;
+ length--;
+ }
+ if (*s == '\r' && *(s + 1) == '\n') {
+ s++;
+ length--;
+ }
+ *d++ = *s++;
+ }
+ *d = '\0';
+ str->len = length + 1;
+
+ /* p points to the "{" in the line that starts the
+ * literal. The length of the CR-less response must be
+ * less than or equal to the length of the response
+ * with CRs, therefore overwriting the old value with
+ * the new value cannot cause an overrun. However, we
+ * don't want it to be shorter either, because then the
+ * GString's length would be off...
*/
- length--;
+ sprintf (p, "{%0*d}", ldigits, str->len);
+
+ fulllen += str->len;
+ g_ptr_array_add (data, str);
+
+ /* Read the next line. */
+ if (camel_remote_store_recv_line (CAMEL_REMOTE_STORE (store),
+ &line, ex) < 0)
+ goto lose;
}
-
- /* Add the length of the post-literal line. */
- fulllen += n;
-
- /* p points to the "{" in the line that starts the literal.
- * The length of the CR-less response must be less than or
- * equal to the length of the response with CRs, therefore
- * overwriting the old value with the new value cannot cause
- * an overrun.
- */
- sprintf (p, "{%d}", length);
/* Now reassemble the data. */
p = line = g_malloc (fulllen + 1);
for (i = 0; i < data->len; i++) {
- length = strlen (data->pdata[i]);
- memcpy (p, data->pdata[i], length);
- g_free (data->pdata[i]);
- p += length;
- *p++ = '\n';
+ str = data->pdata[i];
+ memcpy (p, str->str, str->len);
+ p += str->len;
+ g_string_free (str, TRUE);
}
*p = '\0';
g_ptr_array_free (data, TRUE);
return line;
+
+ lose:
+ for (i = 0; i < data->len; i++)
+ g_string_free (data->pdata[i], TRUE);
+ g_ptr_array_free (data, TRUE);
+ return NULL;
}