From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aaron Miller <aaronmiller@fb.com>
Date: Fri, 29 Jul 2016 17:41:38 +0800
Subject: [PATCH] net: read bracketed ipv6 addrs and port numbers

Allow specifying port numbers for http and tftp paths, and allow ipv6 addresses
to be recognized with brackets around them, which is required to specify a port
number

Signed-off-by: Aaron Miller <aaronmiller@fb.com>
[pjones: various bug fixes]
Signed-off-by: Peter Jones <pjones@redhat.com>
---
 grub-core/net/http.c | 25 ++++++++++++---
 grub-core/net/net.c  | 87 +++++++++++++++++++++++++++++++++++++++++++++++++---
 grub-core/net/tftp.c |  8 +++--
 include/grub/net.h   |  1 +
 4 files changed, 109 insertions(+), 12 deletions(-)

diff --git a/grub-core/net/http.c b/grub-core/net/http.c
index b616cf40b1..12a2632ea5 100644
--- a/grub-core/net/http.c
+++ b/grub-core/net/http.c
@@ -289,7 +289,9 @@ http_receive (grub_net_tcp_socket_t sock __attribute__ ((unused)),
 	  nb2 = grub_netbuff_alloc (data->chunk_rem);
 	  if (!nb2)
 	    return grub_errno;
-	  grub_netbuff_put (nb2, data->chunk_rem);
+	  err = grub_netbuff_put (nb2, data->chunk_rem);
+	  if (err)
+	    return grub_errno;
 	  grub_memcpy (nb2->data, nb->data, data->chunk_rem);
 	  if (file->device->net->packs.count >= 20)
 	    {
@@ -312,12 +314,14 @@ http_establish (struct grub_file *file, grub_off_t offset, int initial)
   int i;
   struct grub_net_buff *nb;
   grub_err_t err;
+  char* server = file->device->net->server;
+  int port = file->device->net->port;
 
   nb = grub_netbuff_alloc (GRUB_NET_TCP_RESERVE_SIZE
 			   + sizeof ("GET ") - 1
 			   + grub_strlen (data->filename)
 			   + sizeof (" HTTP/1.1\r\nHost: ") - 1
-			   + grub_strlen (file->device->net->server)
+			   + grub_strlen (server) + sizeof (":XXXXXXXXXX")
 			   + sizeof ("\r\nUser-Agent: " PACKAGE_STRING
 				     "\r\n") - 1
 			   + sizeof ("Range: bytes=XXXXXXXXXXXXXXXXXXXX"
@@ -356,7 +360,7 @@ http_establish (struct grub_file *file, grub_off_t offset, int initial)
 	       sizeof (" HTTP/1.1\r\nHost: ") - 1);
 
   ptr = nb->tail;
-  err = grub_netbuff_put (nb, grub_strlen (file->device->net->server));
+  err = grub_netbuff_put (nb, grub_strlen (server));
   if (err)
     {
       grub_netbuff_free (nb);
@@ -365,6 +369,15 @@ http_establish (struct grub_file *file, grub_off_t offset, int initial)
   grub_memcpy (ptr, file->device->net->server,
 	       grub_strlen (file->device->net->server));
 
+  if (port)
+    {
+      ptr = nb->tail;
+      grub_snprintf ((char *) ptr,
+	  sizeof (":XXXXXXXXXX"),
+	  ":%d",
+	  port);
+    }
+
   ptr = nb->tail;
   err = grub_netbuff_put (nb, 
 			  sizeof ("\r\nUser-Agent: " PACKAGE_STRING "\r\n")
@@ -390,8 +403,10 @@ http_establish (struct grub_file *file, grub_off_t offset, int initial)
   grub_netbuff_put (nb, 2);
   grub_memcpy (ptr, "\r\n", 2);
 
-  data->sock = grub_net_tcp_open (file->device->net->server,
-				  HTTP_PORT, http_receive,
+  grub_dprintf ("http", "opening path %s on host %s TCP port %d\n",
+		data->filename, server, port ? port : HTTP_PORT);
+  data->sock = grub_net_tcp_open (server,
+				  port ? port : HTTP_PORT, http_receive,
 				  http_err, NULL,
 				  file);
   if (!data->sock)
diff --git a/grub-core/net/net.c b/grub-core/net/net.c
index a46f82362e..0ce5e675ed 100644
--- a/grub-core/net/net.c
+++ b/grub-core/net/net.c
@@ -444,6 +444,13 @@ parse_ip6 (const char *val, grub_uint64_t *ip, const char **rest)
   grub_uint16_t newip[8];
   const char *ptr = val;
   int word, quaddot = -1;
+  int bracketed = 0;
+
+  if (ptr[0] == '[')
+    {
+      bracketed = 1;
+      ptr++;
+    }
 
   if (ptr[0] == ':' && ptr[1] != ':')
     return 0;
@@ -482,6 +489,8 @@ parse_ip6 (const char *val, grub_uint64_t *ip, const char **rest)
       grub_memset (&newip[quaddot], 0, (7 - word) * sizeof (newip[0]));
     }
   grub_memcpy (ip, newip, 16);
+  if (bracketed && *ptr == ']')
+    ptr++;
   if (rest)
     *rest = ptr;
   return 1;
@@ -1343,8 +1352,10 @@ grub_net_open_real (const char *name)
 {
   grub_net_app_level_t proto;
   const char *protname, *server;
+  char *host;
   grub_size_t protnamelen;
   int try;
+  int port = 0;
 
   if (grub_strncmp (name, "pxe:", sizeof ("pxe:") - 1) == 0)
     {
@@ -1382,6 +1393,72 @@ grub_net_open_real (const char *name)
       return NULL;
     }  
 
+  char* port_start;
+  /* ipv6 or port specified? */
+  if ((port_start = grub_strchr (server, ':')))
+    {
+      char* ipv6_begin;
+      if((ipv6_begin = grub_strchr (server, '[')))
+	{
+	  char* ipv6_end = grub_strchr (server, ']');
+	  if(!ipv6_end)
+	    {
+	      grub_error (GRUB_ERR_NET_BAD_ADDRESS,
+		      N_("mismatched [ in address"));
+	      return NULL;
+	    }
+	  /* port number after bracketed ipv6 addr */
+	  if(ipv6_end[1] == ':')
+	    {
+	      port = grub_strtoul (ipv6_end + 2, NULL, 10);
+	      if(port > 65535)
+		{
+		  grub_error (GRUB_ERR_NET_BAD_ADDRESS,
+			  N_("bad port number"));
+		  return NULL;
+		}
+	    }
+	  host = grub_strndup (ipv6_begin, (ipv6_end - ipv6_begin) + 1);
+	}
+      else
+	{
+	  if (grub_strchr (port_start + 1, ':'))
+	    {
+	      int iplen = grub_strlen (server);
+	      /* bracket bare ipv6 addrs */
+	      host = grub_malloc (iplen + 3);
+	      if(!host)
+		{
+		  return NULL;
+		}
+	      host[0] = '[';
+	      grub_memcpy (host + 1, server, iplen);
+	      host[iplen + 1] = ']';
+	      host[iplen + 2] = '\0';
+	    }
+	  else
+	    {
+	      /* hostname:port or ipv4:port */
+	      port = grub_strtol (port_start + 1, NULL, 10);
+	      if(port > 65535)
+		{
+		  grub_error (GRUB_ERR_NET_BAD_ADDRESS,
+			  N_("bad port number"));
+		  return NULL;
+		}
+	      host = grub_strndup (server, port_start - server);
+	    }
+	}
+    }
+  else
+    {
+      host = grub_strdup (server);
+    }
+  if (!host)
+    {
+      return NULL;
+    }
+
   for (try = 0; try < 2; try++)
     {
       FOR_NET_APP_LEVEL (proto)
@@ -1391,14 +1468,13 @@ grub_net_open_real (const char *name)
 	  {
 	    grub_net_t ret = grub_zalloc (sizeof (*ret));
 	    if (!ret)
-	      return NULL;
-	    ret->protocol = proto;
-	    ret->server = grub_strdup (server);
-	    if (!ret->server)
 	      {
-		grub_free (ret);
+		grub_free (host);
 		return NULL;
 	      }
+	    ret->protocol = proto;
+	    ret->port = port;
+	    ret->server = host;
 	    ret->fs = &grub_net_fs;
 	    return ret;
 	  }
@@ -1473,6 +1549,7 @@ grub_net_open_real (const char *name)
   grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("disk `%s' not found"),
 	      name);
 
+  grub_free (host);
   return NULL;
 }
 
diff --git a/grub-core/net/tftp.c b/grub-core/net/tftp.c
index 4ab2f5c735..d54b13f09f 100644
--- a/grub-core/net/tftp.c
+++ b/grub-core/net/tftp.c
@@ -295,6 +295,7 @@ tftp_open (struct grub_file *file, const char *filename)
   grub_err_t err;
   grub_uint8_t *nbd;
   grub_net_network_level_address_t addr;
+  int port = file->device->net->port;
 
   data = grub_zalloc (sizeof (*data));
   if (!data)
@@ -362,14 +363,17 @@ tftp_open (struct grub_file *file, const char *filename)
   err = grub_net_resolve_address (file->device->net->server, &addr);
   if (err)
     {
-      grub_dprintf("tftp", "Address resolution failed: %d\n", err);
+      grub_dprintf ("tftp", "Address resolution failed: %d\n", err);
+      grub_dprintf ("tftp", "file_size is %llu, block_size is %llu\n",
+		    (unsigned long long)data->file_size,
+		    (unsigned long long)data->block_size);
       grub_free (data);
       return err;
     }
 
   grub_dprintf("tftp", "opening connection\n");
   data->sock = grub_net_udp_open (addr,
-				  TFTP_SERVER_PORT, tftp_receive,
+				  port ? port : TFTP_SERVER_PORT, tftp_receive,
 				  file);
   if (!data->sock)
     {
diff --git a/include/grub/net.h b/include/grub/net.h
index af0404db7e..d55d505a03 100644
--- a/include/grub/net.h
+++ b/include/grub/net.h
@@ -273,6 +273,7 @@ typedef struct grub_net
 {
   char *server;
   char *name;
+  int port;
   grub_net_app_level_t protocol;
   grub_net_packets_t packs;
   grub_off_t offset;