COMM_CSR
if (writebuf(filesock, COMM_CSR, csr, csrsz) < 0)
if ((csr = readbuf(netsock, COMM_CSR, &csrsz)) == NULL)
if ((csr = readbuf(certsock, COMM_CSR, &csz)) == NULL)
if ((cert = readstr(rfd, COMM_CSR)) == NULL)
else if (writebuf(cfd, COMM_CSR, c.buf.buf, c.buf.sz) <= 0)
} else if (writestr(fd, COMM_CSR, der64) >= 0)