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ssl_mail_client: Check return value of mbedtls_snprintf

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The return value of snprintf() is the number of characters (excluding
the null terminator) which would have been written to the buffer if
enough space had been available. Thus, a return value of size or more
means the output was truncated.

Signed-off-by: Mingjie Shen <shen497@purdue.edu>
This commit is contained in:
Mingjie Shen 2024-03-12 16:23:41 -04:00
parent 0fc20cd447
commit 8e35d96057
1 changed files with 12 additions and 0 deletions
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12
programs/ssl/ssl_mail_client.c
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@ -728,6 +728,10 @@ usage:
fflush(stdout);
len = mbedtls_snprintf((char *) buf, sizeof(buf), "MAIL FROM:<%s>\r\n", opt.mail_from);
if (len < 0 || (size_t)len >= sizeof(buf)) {
mbedtls_printf(" failed\n ! mbedtls_snprintf encountered error or truncated output\n\n");
goto exit;
}
ret = write_ssl_and_get_response(&ssl, buf, len);
if (ret < 200 || ret > 299) {
mbedtls_printf(" failed\n ! server responded with %d\n\n", ret);
@ -740,6 +744,10 @@ usage:
fflush(stdout);
len = mbedtls_snprintf((char *) buf, sizeof(buf), "RCPT TO:<%s>\r\n", opt.mail_to);
if (len < 0 || (size_t)len >= sizeof(buf)) {
mbedtls_printf(" failed\n ! mbedtls_snprintf encountered error or truncated output\n\n");
goto exit;
}
ret = write_ssl_and_get_response(&ssl, buf, len);
if (ret < 200 || ret > 299) {
mbedtls_printf(" failed\n ! server responded with %d\n\n", ret);
@ -769,6 +777,10 @@ usage:
"Mbed TLS mail client example.\r\n"
"\r\n"
"Enjoy!", opt.mail_from);
if (len < 0 || (size_t)len >= sizeof(buf)) {
mbedtls_printf(" failed\n ! mbedtls_snprintf encountered error or truncated output\n\n");
goto exit;
}
ret = write_ssl_data(&ssl, buf, len);
len = sprintf((char *) buf, "\r\n.\r\n");