common/cmd_autoscript.c

   1 /*
   2  * (C) Copyright 2001
   3  * Kyle Harris, kharris@nexus-tech.net
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * autoscript allows a remote host to download a command file and,
  26  * optionally, binary data for automatically updating the target. For
  27  * example, you create a new kernel image and want the user to be
  28  * able to simply download the image and the machine does the rest.
  29  * The kernel image is postprocessed with mkimage, which creates an
  30  * image with a script file prepended. If enabled, autoscript will
  31  * verify the script and contents of the download and execute the
  32  * script portion. This would be responsible for erasing flash,
  33  * copying the new image, and rebooting the machine.
  34  */
  35
  36 /* #define DEBUG */
  37
  38 #include <common.h>
  39 #include <command.h>
  40 #include <image.h>
  41 #include <malloc.h>
  42 #include <asm/byteorder.h>
  43 #include <cmd_boot.h>
  44 #include <cmd_autoscript.h>
  45 #if defined(CONFIG_8xx)
  46 #include <mpc8xx.h>
  47 #endif
  48 #ifdef CFG_HUSH_PARSER
  49 #include <hush.h>
  50 #endif
  51
  52 #if defined(CONFIG_AUTOSCRIPT) || \
  53          (CONFIG_COMMANDS & CFG_CMD_AUTOSCRIPT)
  54
  55 extern image_header_t header;           /* from cmd_bootm.c */
  56 int
  57 autoscript (ulong addr)
  58 {
  59         ulong crc, data, len;
  60         image_header_t *hdr = &header;
  61         ulong *len_ptr;
  62         char *cmd;
  63         int rcode = 0;
  64         int verify;
  65
  66         cmd = getenv ("verify");
  67         verify = (cmd && (*cmd == 'n')) ? 0 : 1;
  68
  69
  70         memmove (hdr, (char *)addr, sizeof(image_header_t));
  71
  72         if (ntohl(hdr->ih_magic) != IH_MAGIC) {
  73                 printf ("Bad magic number\n");
  74                 return 1;
  75         }
  76
  77         crc = ntohl(hdr->ih_hcrc);
  78         hdr->ih_hcrc = 0;
  79         len = sizeof (image_header_t);
  80         data = (ulong)hdr;
  81         if (crc32(0, (char *)data, len) != crc) {
  82                 printf ("Bad header crc\n");
  83                 return 1;
  84         }
  85
  86         data = addr + sizeof(image_header_t);
  87         len = ntohl(hdr->ih_size);
  88
  89         if (verify) {
  90                 if (crc32(0, (char *)data, len) != ntohl(hdr->ih_dcrc)) {
  91                         printf ("Bad data crc\n");
  92                         return 1;
  93                 }
  94         }
  95
  96         if (hdr->ih_type != IH_TYPE_SCRIPT) {
  97                 printf ("Bad image type\n");
  98                 return 1;
  99         }
 100
 101         /* get length of script */
 102         len_ptr = (ulong *)data;
 103
 104         if ((len = ntohl(*len_ptr)) == 0) {
 105                 printf ("Empty Script\n");
 106                 return 1;
 107         }
 108
 109         debug ("** Script length: %ld\n", len);
 110
 111         if ((cmd = malloc (len + 1)) == NULL) {
 112                 return 1;
 113         }
 114
 115         while (*len_ptr++);
 116
 117         /* make sure cmd is null terminated */
 118         memmove (cmd, (char *)len_ptr, len);
 119         *(cmd + len) = 0;
 120
 121 #ifdef CFG_HUSH_PARSER
 122         rcode = parse_string_outer (cmd, FLAG_PARSE_SEMICOLON);
 123 #else
 124         {
 125                 char *line = cmd;
 126                 char *next = cmd;
 127
 128                 /*
 129                  * break into individual lines,
 130                  * and execute each line;
 131                  * terminate on error.
 132                  */
 133                 while (*next) {
 134                         if (*next == '\n') {
 135                                 *next = '\0';
 136                                 /* run only non-empty commands */
 137                                 if ((next - line) > 1) {
 138                                         debug ("** exec: \"%s\"\n",
 139                                                 line);
 140                                         if (run_command (line, 0) < 0) {
 141                                                 rcode = 1;
 142                                                 break;
 143                                         }
 144                                 }
 145                                 line = next + 1;
 146                         }
 147                         ++next;
 148                 }
 149         }
 150 #endif
 151         free (cmd);
 152         return rcode;
 153 }
 154
 155 #endif  /* CONFIG_AUTOSCRIPT || CFG_CMD_AUTOSCRIPT */
 156
 157 #if (CONFIG_COMMANDS & CFG_CMD_AUTOSCRIPT)
 158 int
 159 do_autoscript (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 160 {
 161         ulong addr;
 162         int rcode;
 163
 164         if (argc < 2) {
 165                 addr = CFG_LOAD_ADDR;
 166         } else {
 167                 addr = simple_strtoul (argv[1],0,16);
 168         }
 169
 170         printf ("## Executing script at %08lx\n",addr);
 171         rcode = autoscript (addr);
 172         return rcode;
 173 }
 174 #endif /* CFG_CMD_AUTOSCRIPT */