From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Peter Jones <pjones@redhat.com>

Date: Tue, 14 Jun 2016 16:18:44 -0400

Subject: [PATCH] Add a url parser.

This patch adds a url parser that can parse http, https, tftp, and tftps

urls, and is easily extensible to handle more types.

It's a little ugly in terms of the arguments it takes.

Signed-off-by: Peter Jones <pjones@redhat.com>

---

 grub-core/Makefile.core.def |   1 +

 grub-core/kern/misc.c       |  13 +

 grub-core/net/url.c         | 861 ++++++++++++++++++++++++++++++++++++++++++++

 include/grub/misc.h         |  45 +++

 include/grub/net/url.h      |  28 ++

 5 files changed, 948 insertions(+)

 create mode 100644 grub-core/net/url.c

 create mode 100644 include/grub/net/url.h

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def

index cd0902b46..991891a6e 100644

--- a/grub-core/Makefile.core.def

+++ b/grub-core/Makefile.core.def

@@ -2185,6 +2185,7 @@ module = {

   common = net/ethernet.c;

   common = net/arp.c;

   common = net/netbuff.c;

+  common = net/url.c;

 };

 module = {

diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c

index 8344526be..f1fab7000 100644

--- a/grub-core/kern/misc.c

+++ b/grub-core/kern/misc.c

@@ -296,6 +296,19 @@ grub_strrchr (const char *s, int c)

   return p;

 }

+char *

+grub_strchrnul (const char *s, int c)

+{

+  do

+    {

+      if (*s == c)

+	break;

+    }

+  while (*s++);

+

+  return (char *) s;

+}

+

 int

 grub_strword (const char *haystack, const char *needle)

 {

diff --git a/grub-core/net/url.c b/grub-core/net/url.c

new file mode 100644

index 000000000..146858284

--- /dev/null

+++ b/grub-core/net/url.c

@@ -0,0 +1,861 @@

+/*

+ *  GRUB  --  GRand Unified Bootloader

+ *  Copyright (C) 2016  Free Software Foundation, Inc.

+ *

+ *  GRUB is free software: you can redistribute it and/or modify

+ *  it under the terms of the GNU General Public License as published by

+ *  the Free Software Foundation, either version 3 of the License, or

+ *  (at your option) any later version.

+ *

+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.

+ */

+

+#ifdef URL_TEST

+

+#define _GNU_SOURCE 1

+

+#include <errno.h>

+#include <limits.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+#include <sys/types.h>

+#include <unistd.h>

+

+#define N_(x) x

+

+#define grub_malloc(x) malloc(x)

+#define grub_free(x) ({if (x) free(x);})

+#define grub_error(a, fmt, args...) printf(fmt "\n", ## args)

+#define grub_dprintf(a, fmt, args...) printf(a ": " fmt, ## args)

+#define grub_strlen(x) strlen(x)

+#define grub_strdup(x) strdup(x)

+#define grub_strstr(x,y) strstr(x,y)

+#define grub_memcpy(x,y,z) memcpy(x,y,z)

+#define grub_strcmp(x,y) strcmp(x,y)

+#define grub_strncmp(x,y,z) strncmp(x,y,z)

+#define grub_strcasecmp(x,y) strcasecmp(x,y)

+#define grub_strchrnul(x,y) strchrnul(x,y)

+#define grub_strchr(x,y) strchr(x,y)

+#define grub_strndup(x,y) strndup(x,y)

+#define grub_strtoul(x,y,z) strtoul(x,y,z)

+#define grub_memmove(x,y,z) memmove(x,y,z)

+#define grub_size_t size_t

+#define grub_errno errno

+

+#else

+#include <grub/types.h>

+#include <grub/mm.h>

+#include <grub/misc.h>

+#include <grub/net/url.h>

+#endif

+

+static char *

+translate_slashes(char *str)

+{

+  int i, j;

+  if (str == NULL)

+    return str;

+

+  for (i = 0, j = 0; str[i] != '\0'; i++, j++)

+    {

+      if (str[i] == '\\')

+	{

+	  str[j] = '/';

+	  if (str[i+1] == '\\')

+	    i++;

+	}

+    }

+

+  return str;

+}

+

+static inline int

+hex2int (char c)

+{

+  if (c >= '0' && c <= '9')

+    return c - '0';

+  c |= 0x20;

+  if (c >= 'a' && c <= 'f')

+    return c - 'a' + 10;

+  return -1;

+}

+

+static int

+url_unescape (char *buf, grub_size_t len)

+{

+  int c, rc;

+  unsigned int i;

+

+

+  if (len < 3)

+    {

+      for (i = 0; i < len; i++)

+	if (buf[i] == '%')

+	  return -1;

+      return 0;

+    }

+

+  for (i = 0; len > 2 && i < len - 2; i++)

+    {

+      if (buf[i] == '%')

+	{

+	  unsigned int j;

+	  for (j = i+1; j < i+3; j++)

+	    {

+	      if (!(buf[j] >= '0' && buf[j] <= '9') &&

+		  !(buf[j] >= 'a' && buf[j] <= 'f') &&

+		  !(buf[j] >= 'A' && buf[j] <= 'F'))

+		return -1;

+	    }

+	  i += 2;

+	}

+    }

+  if (i == len - 2)

+    {

+      if (buf[i+1] == '%' || buf[i+2] == '%')

+	return -1;

+    }

+  for (i = 0; i < len - 2; i++)

+    {

+      if (buf[i] == '%')

+	{

+	  rc = hex2int (buf[i+1]);

+	  if (rc < 0)

+	    return -1;

+	  c = (rc & 0xf) << 4;

+	  rc = hex2int (buf[i+2]);

+	  if (rc < 0)

+	    return -1;

+	  c |= (rc & 0xf);

+

+	  buf[i] = c;

+	  grub_memmove (buf+i+1, buf+i+3, len-(i+2));

+	  len -= 2;

+	}

+    }

+  return 0;

+}

+

+static int

+extract_http_url_info (char *url, int ssl,

+		       char **userinfo, char **host, int *port,

+		       char **file)

+{

+  char *colon, *slash, *query, *at = NULL, *separator, *auth_end;

+

+  char *userinfo_off = NULL;

+  char *userinfo_end;

+  char *host_off = NULL;

+  char *host_end;

+  char *port_off = NULL;

+  char *port_end;

+  char *file_off = NULL;

+

+  grub_size_t l;

+  int c;

+

+  if (!url || !userinfo || !host || !port || !file)

+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid argument");

+

+  *userinfo = *host = *file = NULL;

+  *port = -1;

+

+  userinfo_off = url;

+

+  slash = grub_strchrnul (userinfo_off, '/');

+  query = grub_strchrnul (userinfo_off, '?');

+  auth_end = slash < query ? slash : query;

+  /* auth_end here is one /past/ the last character in the auth section, i.e.

+   * it's the : or / or NUL */

+

+  separator = grub_strchrnul (userinfo_off, '@');

+  if (separator > auth_end)

+    {

+      host_off = userinfo_off;

+      userinfo_off = NULL;

+      userinfo_end = NULL;

+    }

+  else

+    {

+      at = separator;

+      *separator = '\0';

+      userinfo_end = separator;

+      host_off = separator + 1;

+    }

+

+  if (*host_off == '[')

+    {

+      separator = grub_strchrnul (host_off, ']');

+      if (separator >= auth_end)

+	goto fail;

+

+      separator += 1;

+      host_end = separator;

+    }

+  else

+    {

+      host_end = separator = colon = grub_strchrnul (host_off, ':');

+

+      if (colon > auth_end)

+	{

+	  separator = NULL;

+	  host_end = auth_end;

+	}

+    }

+

+  if (separator && separator < auth_end)

+    {

+      if (*separator == ':')

+	{

+	  port_off = separator + 1;

+	  port_end = auth_end;

+

+	  if (auth_end - port_end > 0)

+	    goto fail;

+	  if (port_end - port_off < 1)

+	    goto fail;

+	}

+      else

+	goto fail;

+    }

+

+  file_off = auth_end;

+  if (port_off)

+    {

+      unsigned long portul;

+

+      separator = NULL;

+      c = *port_end;

+      *port_end = '\0';

+

+      portul = grub_strtoul (port_off, &separator, 10);

+      *port_end = c;

+#ifdef URL_TEST

+      if (portul == ULONG_MAX && errno == ERANGE)

+	goto fail;

+#else

+      if (grub_errno == GRUB_ERR_OUT_OF_RANGE)

+	goto fail;

+#endif

+      if (portul & ~0xfffful)

+	goto fail;

+      if (separator != port_end)

+	goto fail;

+

+      *port = portul & 0xfffful;

+    }

+  else if (ssl)

+    *port = 443;

+  else

+    *port = 80;

+

+  if (userinfo_off && *userinfo_off)

+    {

+      l = userinfo_end - userinfo_off + 1;

+

+      *userinfo = grub_strndup (userinfo_off, l);

+      if (!*userinfo)

+	goto fail;

+      (*userinfo)[l-1]= '\0';

+    }

+

+  l = host_end - host_off;

+

+  if (host_end == NULL)

+    goto fail;

+  else

+    c = *host_end;

+

+  *host_end = '\0';

+  *host = grub_strndup (host_off, l);

+  *host_end = c;

+  if (!*host)

+    goto fail;

+  (*host)[l] = '\0';

+

+  *file = grub_strdup (file_off);

+  if (!*file)

+    goto fail;

+

+  if (at)

+    *at = '@';

+  return 0;

+fail:

+  if (at)

+    *at = '@';

+  grub_free (*userinfo);

+  grub_free (*host);

+  grub_free (*file);

+

+  return -1;

+}

+

+static int

+extract_tftp_url_info (char *url, int ssl, char **host, char **file, int *port)

+{

+  char *slash, *semi;

+

+  char *host_off = url;

+  char *host_end;

+  char *file_off;

+

+  int c;

+

+  if (!url || !host || !file || !port)

+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid argument");

+

+  if (ssl)

+    *port = 3713;

+  else

+    *port = 69;

+

+  slash = grub_strchr (url, '/');

+  if (!slash)

+    return -1;

+

+  host_end = file_off = slash;

+

+  semi = grub_strchrnul (slash, ';');

+  if (!grub_strncmp (semi, ";mode=", 6) && grub_strcmp (semi+6, "octet"))

+    {

+      grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,

+		  N_("TFTP mode `%s' is not implemented."), semi+6);

+      return -1;

+    }

+

+  /*

+   * Maybe somebody added a new method, I dunno.  Anyway, semi is a reserved

+   * character, so if it's there, it's the start of the mode block or it's

+   * invalid.  So set it to \0 unconditionally, not just for ;mode=octet

+   */

+  *semi = '\0';

+

+  c = *host_end;

+  *host_end = '\0';

+  *host = grub_strdup (host_off);

+  *host_end = c;

+

+  *file = grub_strdup (file_off);

+

+  if (!*file || !*host)

+    {

+      grub_free (*file);

+      grub_free (*host);

+      return -1;

+    }

+

+  return 0;

+}

+

+int

+extract_url_info (const char *urlbuf, grub_size_t buflen,

+		  char **scheme, char **userinfo,

+		  char **host, int *port, char **file)

+{

+  char *url;

+  char *colon;

+

+  char *scheme_off;

+  char *specific_off;

+

+  int rc;

+  int c;

+

+  int https;

+

+  if (!urlbuf || !buflen || !scheme || !userinfo || !host || !port || !file)

+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid argument");

+

+  *scheme = *userinfo = *host = *file = NULL;

+  *port = -1;

+

+  /* make sure we have our own coherent grub_string. */

+  url = grub_malloc (buflen + 1);

+  if (!url)

+    return -1;

+

+  grub_memcpy (url, urlbuf, buflen);

+  url[buflen] = '\0';

+

+  grub_dprintf ("net", "dhcpv6 boot-file-url: `%s'\n", url);

+

+  /* get rid of any backslashes */

+  url = translate_slashes (url);

+

+  /* find the constituent parts */

+  colon = grub_strstr (url, "://");

+  if (!colon)

+    goto fail;

+

+  scheme_off = url;

+  c = *colon;

+  *colon = '\0';

+  specific_off = colon + 3;

+

+  https = !grub_strcasecmp (scheme_off, "https");

+

+  rc = 0;

+  if (!grub_strcasecmp (scheme_off, "tftp"))

+    {

+      rc = extract_tftp_url_info (specific_off, 0, host, file, port);

+    }

+#ifdef URL_TEST

+  else if (!grub_strcasecmp (scheme_off, "http") || https)

+#else

+  else if (!grub_strcasecmp (scheme_off, "http"))

+#endif

+    {

+      rc = extract_http_url_info (specific_off,

+				  https, userinfo, host, port, file);

+    }

+#ifdef URL_TEST

+  else if (!grub_strcasecmp (scheme_off, "iscsi"))

+    {

+      grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,

+		  N_("Unimplemented URL scheme `%s'"), scheme_off);

+      *colon = c;

+      goto fail;

+    }

+  else if (!grub_strcasecmp (scheme_off, "tftps"))

+    {

+      rc = extract_tftp_url_info (specific_off, 1, host, file, port);

+    }

+#endif

+  else

+    {

+      grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,

+		  N_("Unimplemented URL scheme `%s'"), scheme_off);

+      *colon = c;

+      goto fail;

+    }

+

+  if (rc < 0)

+    {

+      *colon = c;

+      goto fail;

+    }

+

+  *scheme = grub_strdup (scheme_off);

+  *colon = c;

+  if (!*scheme)

+    goto fail;

+

+  if (*userinfo)

+    {

+      rc = url_unescape (*userinfo, grub_strlen (*userinfo));

+      if (rc < 0)

+	goto fail;

+    }

+

+  if (*host)

+    {

+      rc = url_unescape (*host, grub_strlen (*host));

+      if (rc < 0)

+	goto fail;

+    }

+

+  if (*file)

+    {

+      rc = url_unescape (*file, grub_strlen (*file));

+      if (rc < 0)

+	goto fail;

+    }

+

+  grub_free (url);

+  return 0;

+fail:

+  grub_free (*scheme);

+  grub_free (*userinfo);

+  grub_free (*host);

+  grub_free (*file);

+

+  if (!grub_errno)

+    grub_error (GRUB_ERR_NET_BAD_ADDRESS, N_("Invalid boot-file-url `%s'"),

+		url);

+  grub_free (url);

+  return -1;

+}

+

+#ifdef URL_TEST

+

+struct test {

+    char *url;

+    int rc;

+    char *scheme;

+    char *userinfo;

+    char *host;

+    int port;

+    char *file;

+} tests[] = {

+  {.url = "http://foo.example.com/",

+   .rc = 0,

+   .scheme = "http",

+   .host = "foo.example.com",

+   .port = 80,

+   .file = "/",

+  },

+  {.url = "http://foo.example.com/?foobar",

+   .rc = 0,

+   .scheme = "http",

+   .host = "foo.example.com",

+   .port = 80,

+   .file = "/?foobar",

+  },

+  {.url = "http://[foo.example.com/",

+   .rc = -1,

+  },

+  {.url = "http://[foo.example.com/?foobar",

+   .rc = -1,

+  },

+  {.url = "http://foo.example.com:/",

+   .rc = -1,

+  },

+  {.url = "http://foo.example.com:81/",

+   .rc = 0,

+   .scheme = "http",

+   .host = "foo.example.com",

+   .port = 81,

+   .file = "/",

+  },

+  {.url = "http://foo.example.com:81/?foobar",

+   .rc = 0,

+   .scheme = "http",

+   .host = "foo.example.com",

+   .port = 81,

+   .file = "/?foobar",

+  },

+  {.url = "http://[1234::1]/",

+   .rc = 0,

+   .scheme = "http",

+   .host = "[1234::1]",

+   .port = 80,

+   .file = "/",

+  },

+  {.url = "http://[1234::1]/?foobar",

+   .rc = 0,

+   .scheme = "http",

+   .host = "[1234::1]",

+   .port = 80,

+   .file = "/?foobar",

+  },

+  {.url = "http://[1234::1]:81/",

+   .rc = 0,

+   .scheme = "http",

+   .host = "[1234::1]",

+   .port = 81,

+   .file = "/",

+  },

+  {.url = "http://[1234::1]:81/?foobar",

+   .rc = 0,

+   .scheme = "http",

+   .host = "[1234::1]",

+   .port = 81,

+   .file = "/?foobar",

+  },

+  {.url = "http://foo@foo.example.com/",

+   .rc = 0,

+   .scheme = "http",

+   .userinfo = "foo",

+   .host = "foo.example.com",

+   .port = 80,

+   .file = "/",

+  },

+  {.url = "http://foo@foo.example.com/?foobar",

+   .rc = 0,

+   .scheme = "http",

+   .userinfo = "foo",

+   .host = "foo.example.com",

+   .port = 80,

+   .file = "/?foobar",

+  },

+  {.url = "http://foo@[foo.example.com/",

+   .rc = -1,

+  },

+  {.url = "http://foo@[foo.example.com/?foobar",

+   .rc = -1,

+  },

+  {.url = "http://foo@foo.example.com:81/",

+   .rc = 0,

+   .scheme = "http",

+   .userinfo = "foo",

+   .host = "foo.example.com",

+   .port = 81,

+   .file = "/",

+  },

+  {.url = "http://foo@foo.example.com:81/?foobar",

+   .rc = 0,

+   .scheme = "http",

+   .userinfo = "foo",

+   .host = "foo.example.com",

+   .port = 81,

+   .file = "/?foobar",

+  },

+  {.url = "http://foo@[1234::1]/",

+   .rc = 0,

+   .scheme = "http",

+   .userinfo = "foo",

+   .host = "[1234::1]",

+   .port = 80,

+   .file = "/",

+  },

+  {.url = "http://foo@[1234::1]/?foobar",

+   .rc = 0,

+   .scheme = "http",

+   .userinfo = "foo",

+   .host = "[1234::1]",

+   .port = 80,

+   .file = "/?foobar",

+  },

+  {.url = "http://foo@[1234::1]:81/",

+   .rc = 0,

+   .scheme = "http",

+   .userinfo = "foo",

+   .host = "[1234::1]",

+   .port = 81,

+   .file = "/",

+  },

+  {.url = "http://foo@[1234::1]:81/?foobar",

+   .rc = 0,

+   .scheme = "http",

+   .userinfo = "foo",

+   .host = "[1234::1]",

+   .port = 81,

+   .file = "/?foobar",

+  },

+  {.url = "https://foo.example.com/",

+   .rc = 0,

+   .scheme = "https",

+   .host = "foo.example.com",

+   .port = 443,

+   .file = "/",

+  },

+  {.url = "https://foo.example.com/?foobar",

+   .rc = 0,

+   .scheme = "https",

+   .host = "foo.example.com",

+   .port = 443,

+   .file = "/?foobar",

+  },

+  {.url = "https://[foo.example.com/",

+   .rc = -1,

+  },

+  {.url = "https://[foo.example.com/?foobar",

+   .rc = -1,

+  },

+  {.url = "https://foo.example.com:81/",

+   .rc = 0,

+   .scheme = "https",

+   .host = "foo.example.com",

+   .port = 81,