Ç - 如何正确使用OpenSSL的BIO_WRITE() [英] C - How to use OpenSSL's BIO_write() correctly
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问题描述
我是新来的OpenSSL。我明白BIO_WRITE(BIO * B,常量无效* buf中,INT LEN)需要在循环中被调用,但我不能完全肯定,如果我正确地使用它。我写了一个函数是这样的:
I'm new to OpenSSL. I understand BIO_write(BIO *b, const void *buf, int len) needs to be called in a loop but I'm not entirely sure if I'm using it correctly. I've written a function like this:
int32_t SendPacket(BIO * const pBio, const unsigned char * const pPacket, const int nPacketLength)
{
int32_t nPos = 0;
if (!pBio || !pPacket || !nPacketLength)
return -1;
while (nPos < nPacketLength)
{
int32_t nNumberOfBytesWritten = BIO_write(pBio, &pPacket[nPos], nPacketLength - nPos);
if (nNumberOfBytesWritten <= 0)
{
if (!BIO_should_retry(pBio))
return -1;
}
else
{
nPos += nNumberOfBytesWritten;
}
}
return nPos;
}
和我想使用它像这样的:
And I'm thinking of using it like this:
if (SendPacket(pBio, pPacket, nPacketLength) == nPacketLength)
{
// Packet sent correctly.
}
else
{
// Error occurred.
}
请问函数查找正确的?任何反馈是AP preciated。
Does the function look correct? Any feedback is appreciated.
推荐答案
在我原来的职位,我没有重置nNumberOfBytesWritten为0时,重试BIO_WRITE()。
In my original post I wasn't resetting "nNumberOfBytesWritten" to 0 when retrying BIO_write().
最后我做这样的事情:
int32_t SendPacket(BIO * const pBio, const unsigned char * const pPacket, const int32_t nPacketLength)
{
int32_t nPos = 0;
int32_t nNumberOfBytesWritten = 0;
...
for (nPos = 0; nPos < nPacketLength; nPos += nNumberOfBytesWritten)
{
if ((nNumberOfBytesWritten = BIO_write(pBio, pPacket + nPos, nPacketLength - nPos)) <= 0)
{
if (BIO_should_retry(pBio))
{
nNumberOfBytesWritten = 0;
continue;
}
return -1;
}
}
return nPos;
}
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