Changeset 2725 in MondoRescue for branches/2.2.9/mindi-busybox/miscutils/rx.c
- Timestamp:
- Feb 25, 2011, 9:26:54 PM (13 years ago)
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- 1 edited
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branches/2.2.9/mindi-busybox/miscutils/rx.c
r1765 r2725 1 1 /* vi: set sw=4 ts=4: */ 2 /*------------------------------------------------------------------------- 3 * Filename: xmodem.c 2 /* 4 3 * Copyright: Copyright (C) 2001, Hewlett-Packard Company 5 4 * Author: Christopher Hoover <ch@hpl.hp.com> … … 7 6 * and the like 8 7 * Created at: Thu Dec 20 01:58:08 PST 2001 9 *-----------------------------------------------------------------------*/ 10 /* 11 * xmodem.c: xmodem functionality for uploading of kernels and 12 * the like 8 * 9 * xmodem functionality for uploading of kernels and the like 13 10 * 14 11 * Copyright (C) 2001 Hewlett-Packard Laboratories 15 12 * 16 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.13 * Licensed under GPLv2 or later, see file LICENSE in this source tree. 17 14 * 18 15 * This was originally written for blob and then adapted for busybox. 19 *20 16 */ 21 17 … … 28 24 #define NAK 0x15 29 25 #define BS 0x08 26 #define PAD 0x1A 30 27 31 28 /* 32 33 29 Cf: 34 35 30 http://www.textfiles.com/apple/xmodem 36 31 http://www.phys.washington.edu/~belonis/xmodem/docxmodem.txt 37 32 http://www.phys.washington.edu/~belonis/xmodem/docymodem.txt 38 33 http://www.phys.washington.edu/~belonis/xmodem/modmprot.col 39 40 34 */ 41 35 … … 44 38 #define MAXERRORS 10 45 39 46 static int read_byte(int fd, unsigned int timeout) 47 { 48 char buf[1]; 40 #define read_fd STDIN_FILENO 41 #define write_fd STDOUT_FILENO 42 43 static int read_byte(unsigned timeout) 44 { 45 unsigned char buf; 49 46 int n; 50 47 51 48 alarm(timeout); 52 53 n = read(fd, &buf, 1); 54 49 /* NOT safe_read! We want ALRM to interrupt us */ 50 n = read(read_fd, &buf, 1); 55 51 alarm(0); 56 57 52 if (n == 1) 58 return buf[0] & 0xff; 59 else 60 return -1; 61 } 62 63 static int receive(char *error_buf, size_t error_buf_size, 64 int ttyfd, int filefd) 65 { 66 char blockBuf[1024]; 67 unsigned int errors = 0; 68 unsigned int wantBlockNo = 1; 69 unsigned int length = 0; 70 int docrc = 1; 71 char nak = 'C'; 72 unsigned int timeout = TIMEOUT_LONG; 73 74 #define note_error(fmt,args...) \ 75 snprintf(error_buf, error_buf_size, fmt,##args) 53 return buf; 54 return -1; 55 } 56 57 static int receive(/*int read_fd, */int file_fd) 58 { 59 unsigned char blockBuf[1024]; 60 unsigned blockLength = 0; 61 unsigned errors = 0; 62 unsigned wantBlockNo = 1; 63 unsigned length = 0; 64 int do_crc = 1; 65 char reply_char; 66 unsigned timeout = TIMEOUT_LONG; 76 67 77 68 /* Flush pending input */ 78 tcflush( ttyfd, TCIFLUSH);69 tcflush(read_fd, TCIFLUSH); 79 70 80 71 /* Ask for CRC; if we get errors, we will go with checksum */ 81 write(ttyfd, &nak, 1); 72 reply_char = 'C'; 73 full_write(write_fd, &reply_char, 1); 82 74 83 75 for (;;) { 84 76 int blockBegin; 85 77 int blockNo, blockNoOnesCompl; 86 int blockLength; 87 int cksum = 0; 88 int crcHi = 0; 89 int crcLo = 0; 90 91 blockBegin = read_byte(ttyfd, timeout); 78 int cksum_or_crc; 79 int expected; 80 int i, j; 81 82 blockBegin = read_byte(timeout); 92 83 if (blockBegin < 0) 93 84 goto timeout; 94 85 86 /* If last block, remove padding */ 87 if (blockBegin == EOT) { 88 /* Data blocks can be padded with ^Z characters */ 89 /* This code tries to detect and remove them */ 90 if (blockLength >= 3 91 && blockBuf[blockLength - 1] == PAD 92 && blockBuf[blockLength - 2] == PAD 93 && blockBuf[blockLength - 3] == PAD 94 ) { 95 while (blockLength 96 && blockBuf[blockLength - 1] == PAD 97 ) { 98 blockLength--; 99 } 100 } 101 } 102 /* Write previously received block */ 103 if (blockLength) { 104 errno = 0; 105 if (full_write(file_fd, blockBuf, blockLength) != blockLength) { 106 bb_perror_msg("can't write to file"); 107 goto fatal; 108 } 109 } 110 95 111 timeout = TIMEOUT; 96 nak= NAK;112 reply_char = NAK; 97 113 98 114 switch (blockBegin) { … … 100 116 case STX: 101 117 break; 102 103 118 case EOT: 104 nak = ACK; 105 write(ttyfd, &nak, 1); 106 goto done; 107 119 reply_char = ACK; 120 full_write(write_fd, &reply_char, 1); 121 return length; 108 122 default: 109 123 goto error; 110 124 } 111 125 112 /* block no */113 blockNo = read_byte( ttyfd,TIMEOUT);126 /* Block no */ 127 blockNo = read_byte(TIMEOUT); 114 128 if (blockNo < 0) 115 129 goto timeout; 116 130 117 /* block no one's compliment*/118 blockNoOnesCompl = read_byte( ttyfd,TIMEOUT);131 /* Block no, in one's complement form */ 132 blockNoOnesCompl = read_byte(TIMEOUT); 119 133 if (blockNoOnesCompl < 0) 120 134 goto timeout; 121 135 122 136 if (blockNo != (255 - blockNoOnesCompl)) { 123 note_error("bad block ones compl");137 bb_error_msg("bad block ones compl"); 124 138 goto error; 125 139 } … … 127 141 blockLength = (blockBegin == SOH) ? 128 : 1024; 128 142 129 { 130 int i; 131 132 for (i = 0; i < blockLength; i++) { 133 int cc = read_byte(ttyfd, TIMEOUT); 134 if (cc < 0) 135 goto timeout; 136 blockBuf[i] = cc; 137 } 138 } 139 140 if (docrc) { 141 crcHi = read_byte(ttyfd, TIMEOUT); 142 if (crcHi < 0) 143 goto timeout; 144 145 crcLo = read_byte(ttyfd, TIMEOUT); 146 if (crcLo < 0) 143 for (i = 0; i < blockLength; i++) { 144 int cc = read_byte(TIMEOUT); 145 if (cc < 0) 146 goto timeout; 147 blockBuf[i] = cc; 148 } 149 150 if (do_crc) { 151 cksum_or_crc = read_byte(TIMEOUT); 152 if (cksum_or_crc < 0) 153 goto timeout; 154 cksum_or_crc = (cksum_or_crc << 8) | read_byte(TIMEOUT); 155 if (cksum_or_crc < 0) 147 156 goto timeout; 148 157 } else { 149 cksum = read_byte(ttyfd,TIMEOUT);150 if (cksum < 0)158 cksum_or_crc = read_byte(TIMEOUT); 159 if (cksum_or_crc < 0) 151 160 goto timeout; 152 161 } … … 157 166 /* meta data. */ 158 167 goto next; 159 } else if (blockNo != (wantBlockNo & 0xff)) { 160 note_error("unexpected block no, 0x%08x, expecting 0x%08x", blockNo, wantBlockNo); 161 goto error; 162 } 163 164 if (docrc) { 165 int crc = 0; 166 int i, j; 167 int expectedCrcHi; 168 int expectedCrcLo; 169 168 } 169 if (blockNo != (wantBlockNo & 0xff)) { 170 bb_error_msg("unexpected block no, 0x%08x, expecting 0x%08x", blockNo, wantBlockNo); 171 goto error; 172 } 173 174 expected = 0; 175 if (do_crc) { 170 176 for (i = 0; i < blockLength; i++) { 171 crc = crc ^ (int)blockBuf[i] << 8;172 for (j = 0; j < 8; j++) 173 if ( crc& 0x8000)174 crc = crc << 1^ 0x1021;177 expected = expected ^ blockBuf[i] << 8; 178 for (j = 0; j < 8; j++) { 179 if (expected & 0x8000) 180 expected = (expected << 1) ^ 0x1021; 175 181 else 176 crc = crc << 1; 177 } 178 179 expectedCrcHi = (crc >> 8) & 0xff; 180 expectedCrcLo = crc & 0xff; 181 182 if ((crcHi != expectedCrcHi) || 183 (crcLo != expectedCrcLo)) { 184 note_error("crc error, expected 0x%02x 0x%02x, got 0x%02x 0x%02x", expectedCrcHi, expectedCrcLo, crcHi, crcLo); 185 goto error; 186 } 182 expected = (expected << 1); 183 } 184 } 185 expected &= 0xffff; 187 186 } else { 188 unsigned char expectedCksum = 0;189 int i;190 191 187 for (i = 0; i < blockLength; i++) 192 expectedCksum += blockBuf[i]; 193 194 if (cksum != expectedCksum) { 195 note_error("checksum error, expected 0x%02x, got 0x%02x", expectedCksum, cksum); 196 goto error; 197 } 188 expected += blockBuf[i]; 189 expected &= 0xff; 190 } 191 if (cksum_or_crc != expected) { 192 bb_error_msg(do_crc ? "crc error, expected 0x%04x, got 0x%04x" 193 : "checksum error, expected 0x%02x, got 0x%02x", 194 expected, cksum_or_crc); 195 goto error; 198 196 } 199 197 200 198 wantBlockNo++; 201 199 length += blockLength; 202 203 if (full_write(filefd, blockBuf, blockLength) < 0) { 204 note_error("write to file failed: %m"); 205 goto fatal; 206 } 207 208 next: 200 next: 209 201 errors = 0; 210 nak= ACK;211 write(ttyfd, &nak, 1);202 reply_char = ACK; 203 full_write(write_fd, &reply_char, 1); 212 204 continue; 213 214 error: 215 timeout: 205 error: 206 timeout: 216 207 errors++; 217 208 if (errors == MAXERRORS) { 218 209 /* Abort */ 219 210 220 / / if using crc, try again w/o crc221 if ( nak== 'C') {222 nak= NAK;211 /* If were asking for crc, try again w/o crc */ 212 if (reply_char == 'C') { 213 reply_char = NAK; 223 214 errors = 0; 224 docrc = 0; 225 goto timeout; 226 } 227 228 note_error("too many errors; giving up"); 229 230 fatal: 231 /* 5 CAN followed by 5 BS */ 232 write(ttyfd, "\030\030\030\030\030\010\010\010\010\010", 10); 215 do_crc = 0; 216 goto timeout; 217 } 218 bb_error_msg("too many errors; giving up"); 219 fatal: 220 /* 5 CAN followed by 5 BS. Don't try too hard... */ 221 safe_write(write_fd, "\030\030\030\030\030\010\010\010\010\010", 10); 233 222 return -1; 234 223 } 235 224 236 225 /* Flush pending input */ 237 tcflush(ttyfd, TCIFLUSH); 238 239 write(ttyfd, &nak, 1); 226 tcflush(read_fd, TCIFLUSH); 227 228 full_write(write_fd, &reply_char, 1); 229 } /* for (;;) */ 230 } 231 232 static void sigalrm_handler(int UNUSED_PARAM signum) 233 { 234 } 235 236 int rx_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 237 int rx_main(int argc UNUSED_PARAM, char **argv) 238 { 239 struct termios tty, orig_tty; 240 int termios_err; 241 int file_fd; 242 int n; 243 244 /* Disabled by vda: 245 * why we can't receive from stdin? Why we *require* 246 * controlling tty?? */ 247 /*read_fd = xopen(CURRENT_TTY, O_RDWR);*/ 248 file_fd = xopen(single_argv(argv), O_RDWR|O_CREAT|O_TRUNC); 249 250 termios_err = tcgetattr(read_fd, &tty); 251 if (termios_err == 0) { 252 orig_tty = tty; 253 cfmakeraw(&tty); 254 tcsetattr(read_fd, TCSAFLUSH, &tty); 240 255 } 241 256 242 done: 243 return length; 244 245 #undef note_error 246 } 247 248 static void sigalrm_handler(int ATTRIBUTE_UNUSED signum) 249 { 250 } 251 252 int rx_main(int argc, char **argv); 253 int rx_main(int argc, char **argv) 254 { 255 char *fn; 256 int ttyfd, filefd; 257 struct termios tty, orig_tty; 258 struct sigaction act; 259 int n; 260 char error_buf[256]; 261 262 if (argc != 2) 263 bb_show_usage(); 264 265 fn = argv[1]; 266 ttyfd = xopen(CURRENT_TTY, O_RDWR); 267 filefd = xopen(fn, O_RDWR|O_CREAT|O_TRUNC); 268 269 if (tcgetattr(ttyfd, &tty) < 0) 270 bb_perror_msg_and_die("tcgetattr"); 271 272 orig_tty = tty; 273 274 cfmakeraw(&tty); 275 tcsetattr(ttyfd, TCSAFLUSH, &tty); 276 277 memset(&act, 0, sizeof(act)); 278 act.sa_handler = sigalrm_handler; 279 sigaction(SIGALRM, &act, 0); 280 281 n = receive(error_buf, sizeof(error_buf), ttyfd, filefd); 282 283 close(filefd); 284 285 tcsetattr(ttyfd, TCSAFLUSH, &orig_tty); 286 287 if (n < 0) 288 bb_error_msg_and_die("\nreceive failed:\n %s", error_buf); 289 290 fflush_stdout_and_exit(EXIT_SUCCESS); 291 } 257 /* No SA_RESTART: we want ALRM to interrupt read() */ 258 signal_no_SA_RESTART_empty_mask(SIGALRM, sigalrm_handler); 259 260 n = receive(file_fd); 261 262 if (termios_err == 0) 263 tcsetattr(read_fd, TCSAFLUSH, &orig_tty); 264 if (ENABLE_FEATURE_CLEAN_UP) 265 close(file_fd); 266 fflush_stdout_and_exit(n >= 0); 267 }
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