[d6b1d73] | 1 | /* |
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| 2 | * $Id$ |
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| 3 | */ |
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| 4 | |
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| 5 | #if HAVE_CONFIG_H |
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| 6 | #include "config.h" |
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| 7 | #endif |
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| 8 | |
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[0ef748fb] | 9 | /************************************************************************** |
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| 10 | * This file implements the "mount" procedure for tar-based IMFS |
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| 11 | * extensions. The TAR is not actually mounted under the IMFS. |
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| 12 | * Directories from the TAR file are created as usual in the IMFS. |
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| 13 | * File entries are created as IMFS_LINEAR_FILE nodes with their nods |
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| 14 | * pointing to addresses in the TAR image. |
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| 15 | *************************************************************************/ |
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| 16 | |
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[74e0ba5] | 17 | #include <sys/types.h> |
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| 18 | #include <sys/stat.h> |
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| 19 | #include <fcntl.h> |
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| 20 | |
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| 21 | #include <string.h> |
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| 22 | |
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[0ef748fb] | 23 | #include <rtems.h> |
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[d1941587] | 24 | #include <rtems/libio_.h> |
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[0ef748fb] | 25 | #include <chain.h> |
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| 26 | #include <imfs.h> |
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| 27 | |
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| 28 | |
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| 29 | /************************************************************************** |
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| 30 | * TAR file format: |
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| 31 | * |
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| 32 | * Offset Length Contents |
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| 33 | * 0 100 bytes File name ('\0' terminated, 99 maxmum length) |
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| 34 | * 100 8 bytes File mode (in octal ascii) |
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| 35 | * 108 8 bytes User ID (in octal ascii) |
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| 36 | * 116 8 bytes Group ID (in octal ascii) |
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| 37 | * 124 12 bytes File size (s) (in octal ascii) |
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| 38 | * 136 12 bytes Modify time (in octal ascii) |
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| 39 | * 148 8 bytes Header checksum (in octal ascii) |
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| 40 | * 156 1 bytes Link flag |
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| 41 | * 157 100 bytes Linkname ('\0' terminated, 99 maxmum length) |
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| 42 | * 257 8 bytes Magic ("ustar \0") |
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| 43 | * 265 32 bytes User name ('\0' terminated, 31 maxmum length) |
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| 44 | * 297 32 bytes Group name ('\0' terminated, 31 maxmum length) |
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| 45 | * 329 8 bytes Major device ID (in octal ascii) |
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| 46 | * 337 8 bytes Minor device ID (in octal ascii) |
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| 47 | * 345 167 bytes Padding |
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| 48 | * 512 (s+p)bytes File contents (s+p) := (((s) + 511) & ~511), |
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| 49 | * round up to 512 bytes |
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| 50 | * |
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| 51 | * Checksum: |
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| 52 | * int i, sum; |
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| 53 | * char* header = tar_header_pointer; |
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| 54 | * sum = 0; |
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| 55 | * for(i = 0; i < 512; i++) |
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| 56 | * sum += 0xFF & header[i]; |
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| 57 | *************************************************************************/ |
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| 58 | |
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| 59 | #define LF_OLDNORMAL '\0' /* Normal disk file, Unix compatible */ |
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| 60 | #define LF_NORMAL '0' /* Normal disk file */ |
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| 61 | #define LF_LINK '1' /* Link to previously dumped file */ |
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| 62 | #define LF_SYMLINK '2' /* Symbolic link */ |
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| 63 | #define LF_CHR '3' /* Character special file */ |
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| 64 | #define LF_BLK '4' /* Block special file */ |
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| 65 | #define LF_DIR '5' /* Directory */ |
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| 66 | #define LF_FIFO '6' /* FIFO special file */ |
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| 67 | #define LF_CONFIG '7' /* Contiguous file */ |
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| 68 | |
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| 69 | #define MAX_NAME_FIELD_SIZE 99 |
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| 70 | |
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| 71 | #define MIN(a,b) ((a)>(b)?(b):(a)) |
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| 72 | |
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[8670008c] | 73 | static unsigned long octal2ulong(char *octascii, int len); |
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| 74 | static int compute_tar_header_checksum(char *bufr); |
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[0ef748fb] | 75 | |
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| 76 | /************************************************************************** |
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[d1941587] | 77 | * rtems_tarfs_load |
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[0ef748fb] | 78 | * |
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[d1941587] | 79 | * Here we create the mountpoint directory and load the tarfs at |
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[0ef748fb] | 80 | * that node. Once the IMFS has been mounted, we work through the |
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| 81 | * tar image and perform as follows: |
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| 82 | * - For directories, simply call mkdir(). The IMFS creates nodes as |
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| 83 | * needed. |
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| 84 | * - For files, we make our own calls to IMFS eval_for_make and |
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| 85 | * create_node. |
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| 86 | *************************************************************************/ |
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| 87 | int |
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[d1941587] | 88 | rtems_tarfs_load(char *mountpoint, |
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| 89 | unsigned char *tar_image, |
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| 90 | unsigned long tar_size) |
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[0ef748fb] | 91 | { |
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| 92 | rtems_filesystem_location_info_t root_loc; |
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| 93 | rtems_filesystem_location_info_t loc; |
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| 94 | char *hdr_ptr; |
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| 95 | char filename[100]; |
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| 96 | char full_filename[256]; |
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| 97 | int hdr_chksum; |
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| 98 | unsigned char linkflag; |
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| 99 | unsigned long file_size; |
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[d1941587] | 100 | unsigned long file_mode; |
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[0ef748fb] | 101 | int offset; |
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| 102 | unsigned long nblocks; |
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| 103 | IMFS_jnode_t *node; |
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| 104 | int status; |
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| 105 | |
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| 106 | |
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| 107 | status = rtems_filesystem_evaluate_path(mountpoint, 0, &root_loc, 0); |
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| 108 | if (status != 0) |
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| 109 | return(-1); |
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| 110 | |
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[d1941587] | 111 | if (root_loc.ops != &IMFS_ops) |
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| 112 | return(-1); |
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| 113 | |
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[0ef748fb] | 114 | /*********************************************************************** |
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| 115 | * Create an IMFS node structure pointing to tar image memory. |
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| 116 | **********************************************************************/ |
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| 117 | offset = 0; |
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| 118 | while (1) |
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| 119 | { |
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| 120 | if (offset + 512 > tar_size) |
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| 121 | break; |
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| 122 | |
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| 123 | /****************************************************************** |
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| 124 | * Read a header. |
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| 125 | ******************************************************************/ |
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| 126 | hdr_ptr = &tar_image[offset]; |
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| 127 | offset += 512; |
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| 128 | if (strncmp(&hdr_ptr[257], "ustar ", 7)) |
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| 129 | break; |
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| 130 | |
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| 131 | strncpy(filename, hdr_ptr, MAX_NAME_FIELD_SIZE); |
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| 132 | filename[MAX_NAME_FIELD_SIZE] = '\0'; |
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| 133 | |
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| 134 | linkflag = hdr_ptr[156]; |
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[d1941587] | 135 | file_mode = octal2ulong(&hdr_ptr[100], 8); |
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[0ef748fb] | 136 | file_size = octal2ulong(&hdr_ptr[124], 12); |
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| 137 | hdr_chksum = (int)octal2ulong(&hdr_ptr[148], 8); |
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[d1941587] | 138 | |
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[0ef748fb] | 139 | if (compute_tar_header_checksum(hdr_ptr) != hdr_chksum) |
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| 140 | break; |
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| 141 | |
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| 142 | /****************************************************************** |
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| 143 | * Generate an IMFS node depending on the file type. |
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| 144 | * - For directories, just create directories as usual. IMFS |
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| 145 | * will take care of the rest. |
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| 146 | * - For files, create a file node with special tarfs properties. |
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| 147 | *****************************************************************/ |
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| 148 | if (linkflag == LF_DIR) |
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| 149 | { |
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| 150 | strcpy(full_filename, mountpoint); |
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[d1941587] | 151 | if (full_filename[strlen(full_filename)-1] != '/') |
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| 152 | strcat(full_filename, "/"); |
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[0ef748fb] | 153 | strcat(full_filename, filename); |
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| 154 | mkdir(full_filename, S_IRWXU | S_IRWXG | S_IRWXO); |
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| 155 | } |
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[d1941587] | 156 | /****************************************************************** |
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| 157 | * Create a LINEAR_FILE node if no user write permission. |
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| 158 | *****************************************************************/ |
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| 159 | else if ((linkflag == LF_NORMAL) && |
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| 160 | ((file_mode & 0200) == 0000)) |
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[0ef748fb] | 161 | { |
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| 162 | const char *name; |
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| 163 | |
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| 164 | loc = root_loc; |
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| 165 | if (IMFS_evaluate_for_make(filename, &loc, &name) == 0) |
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| 166 | { |
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| 167 | node = IMFS_create_node(&loc, |
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| 168 | IMFS_LINEAR_FILE, (char *)name, |
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| 169 | (S_IRUSR | S_IRGRP | S_IROTH) | S_IFREG, |
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| 170 | NULL); |
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| 171 | node->info.linearfile.size = file_size; |
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| 172 | node->info.linearfile.direct = &tar_image[offset]; |
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| 173 | } |
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| 174 | |
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[d1941587] | 175 | nblocks = (((file_size) + 511) & ~511) / 512; |
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| 176 | offset += 512 * nblocks; |
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| 177 | } |
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| 178 | /****************************************************************** |
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| 179 | * Create a regular MEMORY_FILE if write permission exists. |
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| 180 | *****************************************************************/ |
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| 181 | else if ((linkflag == LF_NORMAL) && |
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| 182 | ((file_mode & 0200) == 0200)) |
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| 183 | { |
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| 184 | int fd; |
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| 185 | int n, left, ptr; |
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| 186 | |
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| 187 | strcpy(full_filename, mountpoint); |
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| 188 | if (full_filename[strlen(full_filename)-1] != '/') |
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| 189 | strcat(full_filename, "/"); |
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| 190 | strcat(full_filename, filename); |
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| 191 | |
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| 192 | fd = creat(full_filename, S_IRUSR|S_IWUSR | S_IRGRP|S_IWGRP); |
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| 193 | if (fd != -1) |
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| 194 | { |
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| 195 | left = file_size; |
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| 196 | ptr = offset; |
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| 197 | while ((n = write(fd, &tar_image[ptr], left)) > 0) |
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| 198 | { |
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| 199 | left -= n; |
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| 200 | ptr += n; |
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| 201 | } |
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| 202 | close(fd); |
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| 203 | } |
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| 204 | |
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[0ef748fb] | 205 | nblocks = (((file_size) + 511) & ~511) / 512; |
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| 206 | offset += 512 * nblocks; |
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| 207 | } |
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| 208 | } |
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| 209 | |
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| 210 | return(status); |
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| 211 | } |
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| 212 | |
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[8670008c] | 213 | /************************************************************************** |
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| 214 | * This converts octal ASCII number representations into an |
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| 215 | * unsigned long. Only support 32-bit numbers for now. |
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| 216 | *************************************************************************/ |
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| 217 | static unsigned long |
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| 218 | octal2ulong(char *octascii, int len) |
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| 219 | { |
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| 220 | int i; |
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| 221 | unsigned long num; |
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| 222 | unsigned long mult; |
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| 223 | |
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| 224 | num = 0; |
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| 225 | mult = 1; |
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| 226 | for (i=len-1; i>=0; i--) |
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| 227 | { |
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[fa2f9790] | 228 | if (octascii[i] < '0') |
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| 229 | continue; |
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| 230 | if (octascii[i] > '9') |
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[8670008c] | 231 | continue; |
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| 232 | |
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| 233 | num += mult*((unsigned long)(octascii[i] - '0')); |
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| 234 | mult *= 8; |
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| 235 | } |
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| 236 | return(num); |
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| 237 | } |
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| 238 | |
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| 239 | |
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| 240 | /************************************************************************ |
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| 241 | * Compute the TAR checksum and check with the value in |
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| 242 | * the archive. The checksum is computed over the entire |
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| 243 | * header, but the checksum field is substituted with blanks. |
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| 244 | ************************************************************************/ |
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| 245 | static int |
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| 246 | compute_tar_header_checksum(char *bufr) |
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| 247 | { |
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| 248 | int i, sum; |
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| 249 | |
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| 250 | |
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| 251 | sum = 0; |
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| 252 | for (i=0; i<512; i++) |
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| 253 | { |
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| 254 | if ((i >= 148) && (i < 156)) |
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| 255 | sum += 0xff & ' '; |
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| 256 | else |
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| 257 | sum += 0xff & bufr[i]; |
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| 258 | } |
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| 259 | return(sum); |
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| 260 | } |
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