OpenWrt – Blame information for rev 1
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Rev | Author | Line No. | Line |
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1 | office | 1 | /* |
2 | * osafeloader |
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3 | * |
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4 | * Copyright (C) 2016 Rafał Miłecki <zajec5@gmail.com> |
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5 | * |
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6 | * This program is free software; you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License version 2 as |
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8 | * published by the Free Software Foundation. |
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9 | */ |
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10 | |||
11 | #include <byteswap.h> |
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12 | #include <endian.h> |
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13 | #include <errno.h> |
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14 | #include <stdint.h> |
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15 | #include <stdio.h> |
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16 | #include <stdlib.h> |
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17 | #include <string.h> |
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18 | #include <unistd.h> |
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19 | |||
20 | #include "md5.h" |
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21 | |||
22 | #if !defined(__BYTE_ORDER) |
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23 | #error "Unknown byte order" |
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24 | #endif |
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25 | |||
26 | #if __BYTE_ORDER == __BIG_ENDIAN |
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27 | #define cpu_to_be32(x) (x) |
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28 | #define be32_to_cpu(x) (x) |
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29 | #define cpu_to_be16(x) (x) |
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30 | #define be16_to_cpu(x) (x) |
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31 | #elif __BYTE_ORDER == __LITTLE_ENDIAN |
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32 | #define cpu_to_be32(x) bswap_32(x) |
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33 | #define be32_to_cpu(x) bswap_32(x) |
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34 | #define cpu_to_be16(x) bswap_16(x) |
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35 | #define be16_to_cpu(x) bswap_16(x) |
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36 | #else |
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37 | #error "Unsupported endianness" |
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38 | #endif |
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39 | |||
40 | struct safeloader_header { |
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41 | uint32_t imagesize; |
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42 | uint8_t md5[16]; |
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43 | } __attribute__ ((packed)); |
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44 | |||
45 | char *safeloader_path; |
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46 | char *partition_name; |
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47 | char *out_path; |
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48 | |||
49 | static inline size_t osafeloader_min(size_t x, size_t y) { |
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50 | return x < y ? x : y; |
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51 | } |
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52 | |||
53 | static const uint8_t md5_salt[16] = { |
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54 | 0x7a, 0x2b, 0x15, 0xed, |
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55 | 0x9b, 0x98, 0x59, 0x6d, |
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56 | 0xe5, 0x04, 0xab, 0x44, |
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57 | 0xac, 0x2a, 0x9f, 0x4e, |
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58 | }; |
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59 | |||
60 | /************************************************** |
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61 | * Info |
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62 | **************************************************/ |
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63 | |||
64 | static int osafeloader_info(int argc, char **argv) { |
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65 | FILE *safeloader; |
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66 | struct safeloader_header hdr; |
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67 | MD5_CTX ctx; |
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68 | size_t bytes, imagesize; |
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69 | uint8_t buf[1024]; |
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70 | uint8_t md5[16]; |
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71 | char name[32]; |
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72 | int base, size, i; |
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73 | int err = 0; |
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74 | |||
75 | if (argc < 3) { |
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76 | fprintf(stderr, "No SafeLoader file passed\n"); |
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77 | err = -EINVAL; |
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78 | goto out; |
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79 | } |
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80 | safeloader_path = argv[2]; |
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81 | |||
82 | safeloader = fopen(safeloader_path, "r"); |
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83 | if (!safeloader) { |
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84 | fprintf(stderr, "Couldn't open %s\n", safeloader_path); |
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85 | err = -EACCES; |
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86 | goto out; |
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87 | } |
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88 | |||
89 | bytes = fread(&hdr, 1, sizeof(hdr), safeloader); |
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90 | if (bytes != sizeof(hdr)) { |
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91 | fprintf(stderr, "Couldn't read %s header\n", safeloader_path); |
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92 | err = -EIO; |
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93 | goto err_close; |
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94 | } |
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95 | imagesize = be32_to_cpu(hdr.imagesize); |
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96 | |||
97 | MD5_Init(&ctx); |
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98 | MD5_Update(&ctx, md5_salt, sizeof(md5_salt)); |
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99 | while ((bytes = fread(buf, 1, osafeloader_min(sizeof(buf), imagesize), safeloader)) > 0) { |
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100 | MD5_Update(&ctx, buf, bytes); |
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101 | imagesize -= bytes; |
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102 | } |
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103 | MD5_Final(md5, &ctx); |
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104 | |||
105 | if (memcmp(md5, hdr.md5, 16)) { |
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106 | fprintf(stderr, "Broken SafeLoader file with invalid MD5\n"); |
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107 | err = -EIO; |
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108 | goto err_close; |
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109 | } |
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110 | |||
111 | printf("%10s: %d\n", "Image size", be32_to_cpu(hdr.imagesize)); |
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112 | printf("%10s: ", "MD5"); |
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113 | for (i = 0; i < 16; i++) |
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114 | printf("%02x", md5[i]); |
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115 | printf("\n"); |
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116 | |||
117 | /* Skip header & vendor info */ |
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118 | fseek(safeloader, 0x1014, SEEK_SET); |
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119 | |||
120 | while (fscanf(safeloader, "fwup-ptn %s base 0x%x size 0x%x\t\r\n", name, &base, &size) == 3) { |
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121 | printf("%10s: %s (0x%x - 0x%x)\n", "Partition", name, base, base + size); |
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122 | } |
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123 | |||
124 | err_close: |
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125 | fclose(safeloader); |
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126 | out: |
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127 | return err; |
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128 | } |
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129 | |||
130 | /************************************************** |
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131 | * Extract |
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132 | **************************************************/ |
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133 | |||
134 | static void osafeloader_extract_parse_options(int argc, char **argv) { |
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135 | int c; |
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136 | |||
137 | while ((c = getopt(argc, argv, "p:o:")) != -1) { |
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138 | switch (c) { |
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139 | case 'p': |
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140 | partition_name = optarg; |
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141 | break; |
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142 | case 'o': |
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143 | out_path = optarg; |
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144 | break; |
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145 | } |
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146 | } |
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147 | } |
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148 | |||
149 | static int osafeloader_extract(int argc, char **argv) { |
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150 | FILE *safeloader; |
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151 | FILE *out; |
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152 | struct safeloader_header hdr; |
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153 | size_t bytes; |
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154 | char name[32]; |
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155 | int base, size; |
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156 | int err = 0; |
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157 | |||
158 | if (argc < 3) { |
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159 | fprintf(stderr, "No SafeLoader file passed\n"); |
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160 | err = -EINVAL; |
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161 | goto out; |
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162 | } |
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163 | safeloader_path = argv[2]; |
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164 | |||
165 | optind = 3; |
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166 | osafeloader_extract_parse_options(argc, argv); |
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167 | if (!partition_name) { |
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168 | fprintf(stderr, "No partition name specified\n"); |
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169 | err = -EINVAL; |
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170 | goto out; |
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171 | } else if (!out_path) { |
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172 | fprintf(stderr, "No output file specified\n"); |
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173 | err = -EINVAL; |
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174 | goto out; |
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175 | } |
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176 | |||
177 | safeloader = fopen(safeloader_path, "r"); |
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178 | if (!safeloader) { |
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179 | fprintf(stderr, "Couldn't open %s\n", safeloader_path); |
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180 | err = -EACCES; |
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181 | goto out; |
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182 | } |
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183 | |||
184 | out = fopen(out_path, "w"); |
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185 | if (!out) { |
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186 | fprintf(stderr, "Couldn't open %s\n", out_path); |
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187 | err = -EACCES; |
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188 | goto err_close_safeloader; |
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189 | } |
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190 | |||
191 | bytes = fread(&hdr, 1, sizeof(hdr), safeloader); |
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192 | if (bytes != sizeof(hdr)) { |
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193 | fprintf(stderr, "Couldn't read %s header\n", safeloader_path); |
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194 | err = -EIO; |
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195 | goto err_close_out; |
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196 | } |
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197 | |||
198 | /* Skip vendor info */ |
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199 | fseek(safeloader, 0x1000, SEEK_CUR); |
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200 | |||
201 | err = -ENOENT; |
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202 | while (fscanf(safeloader, "fwup-ptn %s base 0x%x size 0x%x\t\r\n", name, &base, &size) == 3) { |
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203 | uint8_t buf[1024]; |
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204 | |||
205 | if (strcmp(name, partition_name)) |
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206 | continue; |
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207 | |||
208 | err = 0; |
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209 | |||
210 | fseek(safeloader, sizeof(hdr) + 0x1000 + base, SEEK_SET); |
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211 | |||
212 | while ((bytes = fread(buf, 1, osafeloader_min(sizeof(buf), size), safeloader)) > 0) { |
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213 | if (fwrite(buf, 1, bytes, out) != bytes) { |
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214 | fprintf(stderr, "Couldn't write %zu B to %s\n", bytes, out_path); |
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215 | err = -EIO; |
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216 | break; |
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217 | } |
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218 | size -= bytes; |
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219 | } |
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220 | |||
221 | if (size) { |
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222 | fprintf(stderr, "Couldn't extract whole partition %s from %s (%d B left)\n", partition_name, safeloader_path, size); |
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223 | err = -EIO; |
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224 | } |
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225 | |||
226 | break; |
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227 | } |
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228 | |||
229 | err_close_out: |
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230 | fclose(out); |
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231 | err_close_safeloader: |
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232 | fclose(safeloader); |
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233 | out: |
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234 | return err; |
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235 | } |
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236 | |||
237 | /************************************************** |
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238 | * Start |
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239 | **************************************************/ |
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240 | |||
241 | static void usage() { |
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242 | printf("Usage:\n"); |
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243 | printf("\n"); |
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244 | printf("Info about SafeLoader:\n"); |
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245 | printf("\tosafeloader info <file>\n"); |
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246 | printf("\n"); |
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247 | printf("Extract from SafeLoader:\n"); |
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248 | printf("\tosafeloader extract <file> [options]\n"); |
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249 | printf("\t-p name\t\t\t\tname of partition to extract\n"); |
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250 | printf("\t-o file\t\t\t\toutput file\n"); |
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251 | } |
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252 | |||
253 | int main(int argc, char **argv) { |
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254 | if (argc > 1) { |
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255 | if (!strcmp(argv[1], "info")) |
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256 | return osafeloader_info(argc, argv); |
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257 | else if (!strcmp(argv[1], "extract")) |
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258 | return osafeloader_extract(argc, argv); |
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259 | } |
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260 | |||
261 | usage(); |
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262 | return 0; |
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263 | } |