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Improvements to WOLFSSL_BUFFER function to eliminate recursive call and use snprintf for string safety. Adds support for build-time change of LINE_LEN.

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This commit is contained in:
David Garske
2019-09-10 08:45:52 -07:00
parent c52801754c
commit 66b76a4420
1 changed files with 33 additions and 22 deletions
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55
wolfcrypt/src/logging.c
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@ -277,41 +277,52 @@ void WOLFSSL_MSG(const char* msg)
wolfssl_log(INFO_LOG , msg);
}
#ifndef LINE_LEN
#define LINE_LEN 16
#endif
void WOLFSSL_BUFFER(const byte* buffer, word32 length)
{
#define LINE_LEN 16
int i, buflen = (int)length, bufidx;
char line[(LINE_LEN * 4) + 3]; /* \t00..0F | chars...chars\0 */
if (loggingEnabled) {
word32 i;
char line[80];
if (!loggingEnabled) {
return;
}
if (!buffer) {
wolfssl_log(INFO_LOG, "\tNULL");
if (!buffer) {
wolfssl_log(INFO_LOG, "\tNULL");
return;
}
return;
}
sprintf(line, "\t");
while (buflen > 0) {
bufidx = 0;
XSNPRINTF(&line[bufidx], sizeof(line)-bufidx, "\t");
bufidx++;
for (i = 0; i < LINE_LEN; i++) {
if (i < length)
sprintf(line + 1 + i * 3,"%02x ", buffer[i]);
else
sprintf(line + 1 + i * 3, " ");
if (i < buflen) {
XSNPRINTF(&line[bufidx], sizeof(line)-bufidx, "%02x ", buffer[i]);
}
else {
XSNPRINTF(&line[bufidx], sizeof(line)-bufidx, " ");
}
bufidx += 3;
}
sprintf(line + 1 + LINE_LEN * 3, "| ");
XSNPRINTF(&line[bufidx], sizeof(line)-bufidx, "| ");
bufidx++;
for (i = 0; i < LINE_LEN; i++)
if (i < length)
sprintf(line + 3 + LINE_LEN * 3 + i,
for (i = 0; i < LINE_LEN; i++) {
if (i < buflen) {
XSNPRINTF(&line[bufidx], sizeof(line)-bufidx,
"%c", 31 < buffer[i] && buffer[i] < 127 ? buffer[i] : '.');
bufidx++;
}
}
wolfssl_log(INFO_LOG, line);
if (length > LINE_LEN)
WOLFSSL_BUFFER(buffer + LINE_LEN, length - LINE_LEN);
buffer += LINE_LEN;
buflen -= LINE_LEN;
}
}