summaryrefslogtreecommitdiffstats
path: root/comm/third_party/libotr/toolkit/readotr.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--comm/third_party/libotr/toolkit/readotr.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/comm/third_party/libotr/toolkit/readotr.c b/comm/third_party/libotr/toolkit/readotr.c
new file mode 100644
index 0000000000..77ffcbb6a6
--- /dev/null
+++ b/comm/third_party/libotr/toolkit/readotr.c
@@ -0,0 +1,91 @@
+/*
+ * Off-the-Record Messaging Toolkit
+ * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Nikita Borisov
+ * <otr@cypherpunks.ca>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/* system headers */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+ char *data;
+ size_t len;
+ size_t alloclen;
+} Buffer;
+
+static void buf_new(Buffer *bufp)
+{
+ bufp->data = NULL;
+ bufp->len = 0;
+ bufp->alloclen = 0;
+}
+
+static void buf_put(Buffer *bufp, const char *str, size_t len)
+{
+ while (bufp->len + len + 1 > bufp->alloclen) {
+ char *newdata = realloc(bufp->data, bufp->alloclen + 1024);
+ if (!newdata) {
+ fprintf(stderr, "Out of memory!\n");
+ exit(1);
+ }
+ bufp->data = newdata;
+ bufp->alloclen += 1024;
+ }
+ memmove(bufp->data + bufp->len, str, len);
+ bufp->len += len;
+ bufp->data[bufp->len] = '\0';
+}
+
+static void buf_putc(Buffer *bufp, char c)
+{
+ buf_put(bufp, &c, 1);
+}
+
+/* Read from the given stream until we see a complete OTR Key Exchange
+ * or OTR Data message. Return a newly-allocated pointer to a copy of
+ * this message, which the caller should free(). Returns NULL if no
+ * such message could be found. */
+char *readotr(FILE *stream)
+{
+ int seen = 0;
+ const char header[] = "?OTR:"; /* There are no '?' chars other than
+ the leading one */
+ int headerlen = strlen(header);
+ Buffer buf;
+
+ while(seen < headerlen) {
+ int c = fgetc(stream);
+ if (c == EOF) return NULL;
+ else if (c == header[seen]) seen++;
+ else if (c == header[0]) seen = 1;
+ else seen = 0;
+ }
+
+ buf_new(&buf);
+ buf_put(&buf, header, headerlen);
+
+ /* Look for the trailing '.' */
+ while(1) {
+ int c = fgetc(stream);
+ if (c == EOF) break;
+ buf_putc(&buf, c);
+ if (c == '.') break;
+ }
+
+ return buf.data;
+}