Add ALPN support to libtls.

ok beck@ doug@

1 files changed, 68 insertions, 1 deletions

diff --git a/src/lib/libtls/tls_config.c b/src/lib/libtls/tls_config.c
index 63054ab1e9..e690b9ee76 100644
--- a/src/lib/libtls/tls_config.c
+++ b/src/lib/libtls/tls_config.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tls_config.c,v 1.24 2016/08/02 07:47:11 jsing Exp $ */
+/* $OpenBSD: tls_config.c,v 1.25 2016/08/12 15:10:59 jsing Exp $ */
 /*
  * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
  *
@@ -166,6 +166,7 @@ tls_config_free(struct tls_config *config)
 
         free(config->error.msg);
 
+        free(config->alpn);
         free((char *)config->ca_file);
         free((char *)config->ca_mem);
         free((char *)config->ca_path);
@@ -249,6 +250,72 @@ tls_config_parse_protocols(uint32_t *protocols, const char *protostr)
         return (0);
 }
 
+static int
+tls_config_parse_alpn(struct tls_config *config, const char *alpn,
+    char **alpn_data, size_t *alpn_len)
+{
+        size_t buf_len, i, len;
+        char *buf = NULL;
+        char *s = NULL;
+        char *p, *q;
+
+        if ((buf_len = strlen(alpn) + 1) > 65535) {
+                tls_config_set_errorx(config, "alpn too large");
+                goto err;
+        }
+
+        if ((buf = malloc(buf_len)) == NULL) {
+                tls_config_set_errorx(config, "out of memory");
+                goto err;
+        }
+
+        if ((s = strdup(alpn)) == NULL) {
+                tls_config_set_errorx(config, "out of memory");
+                goto err;
+        }
+
+        i = 0;
+        q = s;
+        while ((p = strsep(&q, ",")) != NULL) {
+                if ((len = strlen(p)) == 0) {
+                        tls_config_set_errorx(config,
+                            "alpn protocol with zero length");
+                        goto err;
+                }
+                if (len > 255) {
+                        tls_config_set_errorx(config,
+                            "alpn protocol too long");
+                        goto err;
+                }
+                buf[i++] = len & 0xff;
+                memcpy(&buf[i], p, len);
+                i += len;
+        }
+
+        free(s);
+
+        *alpn_data = buf;
+        *alpn_len = buf_len;
+
+        return (0);
+
+ err:
+        free(buf);
+        free(s);
+
+        *alpn_data = NULL;
+        *alpn_len = 0;
+
+        return (-1);
+}
+
+int
+tls_config_set_alpn(struct tls_config *config, const char *alpn)
+{
+        return tls_config_parse_alpn(config, alpn, &config->alpn,
+            &config->alpn_len);
+}
+
 int
 tls_config_set_ca_file(struct tls_config *config, const char *ca_file)
 {