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Conditionally enable TFTP block rollover hack

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This commit is contained in:
Joseph C. Lehner 2019-05-02 12:18:22 +02:00
parent 49b156879a
commit b3ba1c016b
1 changed files with 16 additions and 4 deletions
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20
tftp.c
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@ -314,6 +314,7 @@ int tftp_put(struct nmrpd_args *args)
char rx[2048], tx[2048];
const char *file_remote = args->file_remote;
char *val, *end;
bool freeze_block = false;
sock = -1;
ret = -1;
@ -400,7 +401,7 @@ int tftp_put(struct nmrpd_args *args)
if (timeouts || ackblock == block) {
if (!timeouts) {
if (block < UINT16_MAX) {
if (!freeze_block) {
++block;
}
@ -432,9 +433,20 @@ int tftp_put(struct nmrpd_args *args)
}
if (ackblock != -1 && ++errors > 5) {
fprintf(stderr, "Protocol error; bailing out.\n");
ret = -1;
goto cleanup;
if (ackblock == UINT16_MAX && block == 0 && !freeze_block) {
/* work around the 32 MiB limit if block rollover is not
* supported, by transmitting all remaining packets as
* block #65535 - reported working on a Netgear D7000.
*/
block = UINT16_MAX;
freeze_block = true;
errors = 0;
printf("Transmitting rest of file as block %d.\n", block);
} else {
fprintf(stderr, "Protocol error; bailing out.\n");
ret = -1;
goto cleanup;
}
}
}