OpenWrt – Blame information for rev 3
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Rev | Author | Line No. | Line |
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1 | office | 1 | /* |
2 | * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name> |
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3 | * |
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4 | * This program is free software; you can redistribute it and/or modify |
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5 | * it under the terms of the GNU General Public License version 2 |
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6 | * as published by the Free Software Foundation |
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7 | * |
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8 | * This program is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * GNU General Public License for more details. |
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12 | */ |
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13 | #include <sys/types.h> |
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14 | #include <stdio.h> |
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15 | #include <getopt.h> |
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16 | #include <stdbool.h> |
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17 | #include <stdlib.h> |
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18 | #include <string.h> |
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19 | #include <unistd.h> |
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20 | |||
21 | #include "fwimage.h" |
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22 | #include "utils.h" |
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23 | #include "crc32.h" |
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24 | |||
25 | #define METADATA_MAXLEN 30 * 1024 |
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26 | #define SIGNATURE_MAXLEN 1 * 1024 |
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27 | |||
28 | #define BUFLEN (METADATA_MAXLEN + SIGNATURE_MAXLEN + 1024) |
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29 | |||
30 | enum { |
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31 | MODE_DEFAULT = -1, |
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32 | MODE_EXTRACT = 0, |
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33 | MODE_APPEND = 1, |
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34 | }; |
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35 | |||
36 | struct data_buf { |
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37 | char *cur; |
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38 | char *prev; |
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39 | int cur_len; |
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40 | int file_len; |
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41 | }; |
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42 | |||
43 | static FILE *signature_file, *metadata_file, *firmware_file; |
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44 | static int file_mode = MODE_DEFAULT; |
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45 | static bool truncate_file; |
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46 | static bool quiet = false; |
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47 | |||
48 | static uint32_t crc_table[256]; |
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49 | |||
50 | #define msg(...) \ |
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51 | do { \ |
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52 | if (!quiet) \ |
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53 | fprintf(stderr, __VA_ARGS__); \ |
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54 | } while (0) |
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55 | |||
56 | static int |
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57 | usage(const char *progname) |
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58 | { |
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59 | fprintf(stderr, "Usage: %s <options> <firmware>\n" |
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60 | "\n" |
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61 | "Options:\n" |
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62 | " -S <file>: Append signature file to firmware image\n" |
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63 | " -I <file>: Append metadata file to firmware image\n" |
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64 | " -s <file>: Extract signature file from firmware image\n" |
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65 | " -i <file>: Extract metadata file from firmware image\n" |
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66 | " -t: Remove extracted chunks from firmare image (using -s, -i)\n" |
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67 | " -q: Quiet (suppress error messages)\n" |
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68 | "\n", progname); |
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69 | return 1; |
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70 | } |
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71 | |||
72 | static FILE * |
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73 | open_file(const char *name, bool write) |
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74 | { |
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75 | FILE *ret; |
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76 | |||
77 | if (!strcmp(name, "-")) |
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78 | return write ? stdout : stdin; |
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79 | |||
80 | ret = fopen(name, write ? "w" : "r+"); |
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81 | if (!ret && !write) |
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82 | ret = fopen(name, "r"); |
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83 | |||
84 | return ret; |
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85 | } |
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86 | |||
87 | static int |
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88 | set_file(FILE **file, const char *name, int mode) |
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89 | { |
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90 | if (file_mode < 0) |
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91 | file_mode = mode; |
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92 | else if (file_mode != mode) { |
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93 | msg("Error: mixing appending and extracting data is not supported\n"); |
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94 | return 1; |
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95 | } |
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96 | |||
97 | if (*file) { |
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98 | msg("Error: the same append/extract option cannot be used multiple times\n"); |
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99 | return 1; |
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100 | } |
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101 | |||
102 | *file = open_file(name, mode == MODE_EXTRACT); |
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103 | return !*file; |
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104 | } |
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105 | |||
106 | static void |
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107 | trailer_update_crc(struct fwimage_trailer *tr, void *buf, int len) |
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108 | { |
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109 | tr->crc32 = cpu_to_be32(crc32_block(be32_to_cpu(tr->crc32), buf, len, crc_table)); |
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110 | } |
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111 | |||
112 | static int |
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113 | append_data(FILE *in, FILE *out, struct fwimage_trailer *tr, int maxlen) |
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114 | { |
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115 | while (1) { |
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116 | char buf[512]; |
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117 | int len; |
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118 | |||
119 | len = fread(buf, 1, sizeof(buf), in); |
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120 | if (!len) |
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121 | break; |
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122 | |||
123 | maxlen -= len; |
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124 | if (maxlen < 0) |
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125 | return 1; |
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126 | |||
127 | tr->size += len; |
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128 | trailer_update_crc(tr, buf, len); |
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129 | fwrite(buf, len, 1, out); |
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130 | } |
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131 | |||
132 | return 0; |
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133 | } |
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134 | |||
135 | static void |
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136 | append_trailer(FILE *out, struct fwimage_trailer *tr) |
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137 | { |
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138 | tr->size = cpu_to_be32(tr->size); |
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139 | fwrite(tr, sizeof(*tr), 1, out); |
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140 | trailer_update_crc(tr, tr, sizeof(*tr)); |
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141 | } |
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142 | |||
143 | static int |
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144 | add_metadata(struct fwimage_trailer *tr) |
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145 | { |
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146 | struct fwimage_header hdr = {}; |
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147 | |||
148 | tr->type = FWIMAGE_INFO; |
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149 | tr->size = sizeof(hdr) + sizeof(*tr); |
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150 | |||
151 | trailer_update_crc(tr, &hdr, sizeof(hdr)); |
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152 | fwrite(&hdr, sizeof(hdr), 1, firmware_file); |
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153 | |||
154 | if (append_data(metadata_file, firmware_file, tr, METADATA_MAXLEN)) |
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155 | return 1; |
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156 | |||
157 | append_trailer(firmware_file, tr); |
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158 | |||
159 | return 0; |
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160 | } |
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161 | |||
162 | static int |
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163 | add_signature(struct fwimage_trailer *tr) |
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164 | { |
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165 | if (!signature_file) |
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166 | return 0; |
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167 | |||
168 | tr->type = FWIMAGE_SIGNATURE; |
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169 | tr->size = sizeof(*tr); |
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170 | |||
171 | if (append_data(signature_file, firmware_file, tr, SIGNATURE_MAXLEN)) |
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172 | return 1; |
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173 | |||
174 | append_trailer(firmware_file, tr); |
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175 | |||
176 | return 0; |
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177 | } |
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178 | |||
179 | static int |
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180 | add_data(const char *name) |
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181 | { |
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182 | struct fwimage_trailer tr = { |
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183 | .magic = cpu_to_be32(FWIMAGE_MAGIC), |
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184 | .crc32 = ~0, |
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185 | }; |
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186 | int file_len = 0; |
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187 | int ret = 0; |
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188 | |||
189 | firmware_file = fopen(name, "r+"); |
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190 | if (!firmware_file) { |
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191 | msg("Failed to open firmware file\n"); |
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192 | return 1; |
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193 | } |
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194 | |||
195 | while (1) { |
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196 | char buf[512]; |
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197 | int len; |
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198 | |||
199 | len = fread(buf, 1, sizeof(buf), firmware_file); |
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200 | if (!len) |
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201 | break; |
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202 | |||
203 | file_len += len; |
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204 | trailer_update_crc(&tr, buf, len); |
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205 | } |
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206 | |||
207 | if (metadata_file) |
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208 | ret = add_metadata(&tr); |
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209 | else if (signature_file) |
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210 | ret = add_signature(&tr); |
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211 | |||
212 | if (ret) { |
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213 | fflush(firmware_file); |
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214 | ftruncate(fileno(firmware_file), file_len); |
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215 | } |
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216 | |||
217 | return ret; |
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218 | } |
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219 | |||
220 | static void |
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221 | remove_tail(struct data_buf *dbuf, int len) |
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222 | { |
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223 | dbuf->cur_len -= len; |
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224 | dbuf->file_len -= len; |
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225 | |||
226 | if (dbuf->cur_len) |
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227 | return; |
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228 | |||
229 | free(dbuf->cur); |
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230 | dbuf->cur = dbuf->prev; |
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231 | dbuf->prev = NULL; |
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232 | dbuf->cur_len = BUFLEN; |
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233 | } |
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234 | |||
235 | static int |
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236 | extract_tail(struct data_buf *dbuf, void *dest, int len) |
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237 | { |
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238 | int cur_len = dbuf->cur_len; |
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239 | |||
240 | if (!dbuf->cur) |
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241 | return 1; |
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242 | |||
243 | if (cur_len >= len) |
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244 | cur_len = len; |
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245 | |||
246 | memcpy(dest + (len - cur_len), dbuf->cur + dbuf->cur_len - cur_len, cur_len); |
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247 | remove_tail(dbuf, cur_len); |
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248 | |||
249 | cur_len = len - cur_len; |
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250 | if (cur_len && !dbuf->cur) |
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251 | return 1; |
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252 | |||
253 | memcpy(dest, dbuf->cur + dbuf->cur_len - cur_len, cur_len); |
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254 | remove_tail(dbuf, cur_len); |
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255 | |||
256 | return 0; |
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257 | } |
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258 | |||
259 | static uint32_t |
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260 | tail_crc32(struct data_buf *dbuf, uint32_t crc32) |
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261 | { |
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262 | if (dbuf->prev) |
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263 | crc32 = crc32_block(crc32, dbuf->prev, BUFLEN, crc_table); |
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264 | |||
265 | return crc32_block(crc32, dbuf->cur, dbuf->cur_len, crc_table); |
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266 | } |
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267 | |||
268 | static int |
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269 | validate_metadata(struct fwimage_header *hdr, int data_len) |
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270 | { |
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271 | if (hdr->version != 0) |
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272 | return 1; |
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273 | return 0; |
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274 | } |
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275 | |||
276 | static int |
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277 | extract_data(const char *name) |
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278 | { |
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279 | struct fwimage_header *hdr; |
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280 | struct fwimage_trailer tr; |
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281 | struct data_buf dbuf = {}; |
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282 | uint32_t crc32 = ~0; |
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283 | int ret = 1; |
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284 | void *buf; |
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285 | |||
286 | firmware_file = open_file(name, false); |
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287 | if (!firmware_file) { |
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288 | msg("Failed to open firmware file\n"); |
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289 | return 1; |
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290 | } |
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291 | |||
292 | if (truncate_file && firmware_file == stdin) { |
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293 | msg("Cannot truncate file when reading from stdin\n"); |
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294 | return 1; |
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295 | } |
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296 | |||
297 | buf = malloc(BUFLEN); |
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298 | if (!buf) |
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299 | return 1; |
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300 | |||
301 | do { |
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302 | char *tmp = dbuf.cur; |
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303 | |||
304 | dbuf.cur = dbuf.prev; |
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305 | dbuf.prev = tmp; |
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306 | |||
307 | if (dbuf.cur) |
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308 | crc32 = crc32_block(crc32, dbuf.cur, BUFLEN, crc_table); |
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309 | else |
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310 | dbuf.cur = malloc(BUFLEN); |
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311 | |||
312 | if (!dbuf.cur) |
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313 | goto out; |
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314 | |||
315 | dbuf.cur_len = fread(dbuf.cur, 1, BUFLEN, firmware_file); |
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316 | dbuf.file_len += dbuf.cur_len; |
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317 | } while (dbuf.cur_len == BUFLEN); |
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318 | |||
319 | while (1) { |
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3 | office | 320 | int data_len; |
1 | office | 321 | |
322 | if (extract_tail(&dbuf, &tr, sizeof(tr))) |
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323 | break; |
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324 | |||
325 | data_len = be32_to_cpu(tr.size) - sizeof(tr); |
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326 | if (tr.magic != cpu_to_be32(FWIMAGE_MAGIC)) { |
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327 | msg("Data not found\n"); |
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328 | break; |
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329 | } |
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330 | |||
331 | if (be32_to_cpu(tr.crc32) != tail_crc32(&dbuf, crc32)) { |
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332 | msg("CRC error\n"); |
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333 | break; |
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334 | } |
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335 | |||
336 | if (data_len > BUFLEN) { |
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337 | msg("Size error\n"); |
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338 | break; |
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339 | } |
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340 | |||
341 | extract_tail(&dbuf, buf, data_len); |
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342 | |||
343 | if (tr.type == FWIMAGE_SIGNATURE) { |
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344 | if (!signature_file) |
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345 | continue; |
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346 | fwrite(buf, data_len, 1, signature_file); |
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347 | ret = 0; |
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348 | break; |
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349 | } else if (tr.type == FWIMAGE_INFO) { |
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3 | office | 350 | if (!metadata_file) |
1 | office | 351 | break; |
352 | |||
353 | hdr = buf; |
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354 | data_len -= sizeof(*hdr); |
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355 | if (validate_metadata(hdr, data_len)) |
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356 | continue; |
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357 | |||
358 | fwrite(hdr + 1, data_len, 1, metadata_file); |
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359 | ret = 0; |
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360 | break; |
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361 | } else { |
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362 | continue; |
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363 | } |
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364 | } |
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365 | |||
366 | if (!ret && truncate_file) |
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367 | ftruncate(fileno(firmware_file), dbuf.file_len); |
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368 | |||
369 | out: |
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370 | free(buf); |
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371 | free(dbuf.cur); |
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372 | free(dbuf.prev); |
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373 | return ret; |
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374 | } |
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375 | |||
376 | static void cleanup(void) |
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377 | { |
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378 | if (signature_file) |
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379 | fclose(signature_file); |
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380 | if (metadata_file) |
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381 | fclose(metadata_file); |
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382 | if (firmware_file) |
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383 | fclose(firmware_file); |
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384 | } |
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385 | |||
386 | int main(int argc, char **argv) |
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387 | { |
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388 | const char *progname = argv[0]; |
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389 | int ret, ch; |
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390 | |||
391 | crc32_filltable(crc_table); |
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392 | |||
3 | office | 393 | while ((ch = getopt(argc, argv, "i:I:qs:S:t")) != -1) { |
1 | office | 394 | ret = 0; |
395 | switch(ch) { |
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396 | case 'S': |
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397 | ret = set_file(&signature_file, optarg, MODE_APPEND); |
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398 | break; |
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399 | case 'I': |
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400 | ret = set_file(&metadata_file, optarg, MODE_APPEND); |
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401 | break; |
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402 | case 's': |
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403 | ret = set_file(&signature_file, optarg, MODE_EXTRACT); |
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404 | break; |
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405 | case 'i': |
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406 | ret = set_file(&metadata_file, optarg, MODE_EXTRACT); |
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407 | break; |
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408 | case 't': |
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409 | truncate_file = true; |
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410 | break; |
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411 | case 'q': |
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412 | quiet = true; |
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413 | break; |
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414 | } |
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415 | |||
416 | if (ret) |
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417 | goto out; |
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418 | } |
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419 | |||
420 | if (optind >= argc) { |
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421 | ret = usage(progname); |
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422 | goto out; |
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423 | } |
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424 | |||
425 | if (file_mode == MODE_DEFAULT) { |
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426 | ret = usage(progname); |
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427 | goto out; |
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428 | } |
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429 | |||
430 | if (signature_file && metadata_file) { |
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431 | msg("Cannot append/extract metadata and signature in one run\n"); |
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432 | return 1; |
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433 | } |
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434 | |||
435 | if (file_mode) |
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436 | ret = add_data(argv[optind]); |
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437 | else |
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438 | ret = extract_data(argv[optind]); |
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439 | |||
440 | out: |
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441 | cleanup(); |
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442 | return ret; |
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443 | } |