Merge branch 'vendor-class-id' into 'master'

bootp: add support for UEFI HTTP boot

See merge request slirp/libslirp!111

2 files changed, 24 insertions, 0 deletions

diff --git a/src/bootp.c b/src/bootp.c
index 1a3517e..3ade02c 100644
--- a/src/bootp.c
+++ b/src/bootp.c
@@ -34,6 +34,8 @@
 
 #define LEASE_TIME (24 * 3600)
 
+#define UEFI_HTTP_VENDOR_CLASS_ID "HTTPClient"
+
 static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
 
 #define DPRINTF(fmt, ...) DEBUG_CALL(fmt, ##__VA_ARGS__)
@@ -340,6 +342,27 @@ static void bootp_reply(Slirp *slirp,
                 q += val;
             }
         }
+
+        /* this allows to support UEFI HTTP boot: according to the UEFI
+           specification, DHCP server must send vendor class identifier option
+           set to "HTTPClient" string, when responding to DHCP requests as part
+           of the UEFI HTTP boot
+
+           we assume that, if the bootfile parameter was configured as an http
+           URL, the user intends to perform UEFI HTTP boot, so send this option
+           automatically */
+        if (g_str_has_prefix(slirp->bootp_filename, "http://")) {
+            val = strlen(UEFI_HTTP_VENDOR_CLASS_ID);
+            if (q + val + 2 >= end) {
+                g_warning("DHCP packet size exceeded, "
+                          "omitting vendor class id option.");
+            } else {
+                *q++ = RFC2132_VENDOR_CLASS_ID;
+                *q++ = val;
+                memcpy(q, UEFI_HTTP_VENDOR_CLASS_ID, val);
+                q += val;
+            }
+        }
     } else {
         static const char nak_msg[] = "requested address not available";
 
diff --git a/src/bootp.h b/src/bootp.h
index 31ce5fd..cf7797f 100644
--- a/src/bootp.h
+++ b/src/bootp.h
@@ -71,6 +71,7 @@
 #define RFC2132_MAX_SIZE 57
 #define RFC2132_RENEWAL_TIME 58
 #define RFC2132_REBIND_TIME 59
+#define RFC2132_VENDOR_CLASS_ID 60
 #define RFC2132_TFTP_SERVER_NAME 66
 
 #define DHCPDISCOVER 1