1 /* 2 * Based on mkimage.c. 3 * 4 * Written by Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include "dumpimage.h" 10 #include <image.h> 11 #include <version.h> 12 13 static void usage(void); 14 15 /* parameters initialized by core will be used by the image type code */ 16 static struct image_tool_params params = { 17 .type = IH_TYPE_KERNEL, 18 }; 19 20 /* 21 * dumpimage_extract_subimage - 22 * 23 * It scans all registered image types, 24 * verifies image_header for each supported image type 25 * if verification is successful, it extracts the desired file, 26 * indexed by pflag, from the image 27 * 28 * returns negative if input image format does not match with any of 29 * supported image types 30 */ 31 static int dumpimage_extract_subimage(struct image_type_params *tparams, 32 void *ptr, struct stat *sbuf) 33 { 34 int retval = -1; 35 36 if (tparams->verify_header) { 37 retval = tparams->verify_header((unsigned char *)ptr, 38 sbuf->st_size, ¶ms); 39 if (retval != 0) 40 return -1; 41 /* 42 * Extract the file from the image 43 * if verify is successful 44 */ 45 if (tparams->extract_subimage) { 46 retval = tparams->extract_subimage(ptr, ¶ms); 47 } else { 48 fprintf(stderr, 49 "%s: extract_subimage undefined for %s\n", 50 params.cmdname, tparams->name); 51 return -2; 52 } 53 } 54 55 return retval; 56 } 57 58 int main(int argc, char **argv) 59 { 60 int opt; 61 int ifd = -1; 62 struct stat sbuf; 63 char *ptr; 64 int retval = 0; 65 struct image_type_params *tparams = NULL; 66 67 params.cmdname = *argv; 68 69 while ((opt = getopt(argc, argv, "li:o:T:p:V")) != -1) { 70 switch (opt) { 71 case 'l': 72 params.lflag = 1; 73 break; 74 case 'i': 75 params.imagefile = optarg; 76 params.iflag = 1; 77 break; 78 case 'o': 79 params.outfile = optarg; 80 break; 81 case 'T': 82 params.type = genimg_get_type_id(optarg); 83 if (params.type < 0) { 84 usage(); 85 } 86 break; 87 case 'p': 88 params.pflag = strtoul(optarg, &ptr, 10); 89 if (*ptr) { 90 fprintf(stderr, 91 "%s: invalid file position %s\n", 92 params.cmdname, *argv); 93 exit(EXIT_FAILURE); 94 } 95 break; 96 case 'V': 97 printf("dumpimage version %s\n", PLAIN_VERSION); 98 exit(EXIT_SUCCESS); 99 default: 100 usage(); 101 break; 102 } 103 } 104 105 if (optind >= argc) 106 usage(); 107 108 /* set tparams as per input type_id */ 109 tparams = imagetool_get_type(params.type); 110 if (tparams == NULL) { 111 fprintf(stderr, "%s: unsupported type: %s\n", 112 params.cmdname, genimg_get_type_name(params.type)); 113 exit(EXIT_FAILURE); 114 } 115 116 /* 117 * check the passed arguments parameters meets the requirements 118 * as per image type to be generated/listed 119 */ 120 if (tparams->check_params) { 121 if (tparams->check_params(¶ms)) 122 usage(); 123 } 124 125 if (params.iflag) 126 params.datafile = argv[optind]; 127 else 128 params.imagefile = argv[optind]; 129 if (!params.outfile) 130 params.outfile = params.datafile; 131 132 ifd = open(params.imagefile, O_RDONLY|O_BINARY); 133 if (ifd < 0) { 134 fprintf(stderr, "%s: Can't open \"%s\": %s\n", 135 params.cmdname, params.imagefile, 136 strerror(errno)); 137 exit(EXIT_FAILURE); 138 } 139 140 if (params.lflag || params.iflag) { 141 if (fstat(ifd, &sbuf) < 0) { 142 fprintf(stderr, "%s: Can't stat \"%s\": %s\n", 143 params.cmdname, params.imagefile, 144 strerror(errno)); 145 exit(EXIT_FAILURE); 146 } 147 148 if ((uint32_t)sbuf.st_size < tparams->header_size) { 149 fprintf(stderr, 150 "%s: Bad size: \"%s\" is not valid image\n", 151 params.cmdname, params.imagefile); 152 exit(EXIT_FAILURE); 153 } 154 155 ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, ifd, 0); 156 if (ptr == MAP_FAILED) { 157 fprintf(stderr, "%s: Can't read \"%s\": %s\n", 158 params.cmdname, params.imagefile, 159 strerror(errno)); 160 exit(EXIT_FAILURE); 161 } 162 163 /* 164 * Both calls bellow scan through dumpimage registry for all 165 * supported image types and verify the input image file 166 * header for match 167 */ 168 if (params.iflag) { 169 /* 170 * Extract the data files from within the matched 171 * image type. Returns the error code if not matched 172 */ 173 retval = dumpimage_extract_subimage(tparams, ptr, 174 &sbuf); 175 } else { 176 /* 177 * Print the image information for matched image type 178 * Returns the error code if not matched 179 */ 180 retval = imagetool_verify_print_header(ptr, &sbuf, 181 tparams, ¶ms); 182 } 183 184 (void)munmap((void *)ptr, sbuf.st_size); 185 (void)close(ifd); 186 187 return retval; 188 } 189 190 (void)close(ifd); 191 192 return EXIT_SUCCESS; 193 } 194 195 static void usage(void) 196 { 197 fprintf(stderr, "Usage: %s -l image\n" 198 " -l ==> list image header information\n", 199 params.cmdname); 200 fprintf(stderr, 201 " %s -i image -T type [-p position] [-o outfile] data_file\n" 202 " -i ==> extract from the 'image' a specific 'data_file'\n" 203 " -T ==> set image type to 'type'\n" 204 " -p ==> 'position' (starting at 0) of the 'data_file' inside the 'image'\n", 205 params.cmdname); 206 fprintf(stderr, 207 " %s -V ==> print version information and exit\n", 208 params.cmdname); 209 210 exit(EXIT_FAILURE); 211 } 212