92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/*
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This file is part of libcapwap.
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libcapwap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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libcapwap is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file
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* @brief Implements DTLS BIO read/write functions.
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*/
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#include <arpa/inet.h>
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#include "cw_log.h"
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#include "dtls.h"
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/**
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* Reads CAPWAP DTLS data from a connection object.
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* @param conn conn object
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* @param out where to write data to
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* @param maxlen maximum number of bytes to read
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* @return the number of bytes read
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*/
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int dtls_bio_read(struct conn *conn, char *out, int maxlen)
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{
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if (conn->dtls_buffer_len == 0) {
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int len = conn->recv_packet(conn, conn->dtls_buffer, 2048);
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if (len < 4)
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return 0;
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conn->dtls_buffer_len = len - 4;
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conn->dtls_buffer_pos = 4;
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}
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if (conn->dtls_buffer_len > maxlen) {
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memcpy(out, conn->dtls_buffer + conn->dtls_buffer_pos, maxlen);
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conn->dtls_buffer_len -= maxlen;
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conn->dtls_buffer_pos += maxlen;
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cw_dbg(DBG_DTLS_BIO, "SSL BIO read: (maxlen = %d), read %d, remain %d", maxlen,
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maxlen, conn->dtls_buffer_len);
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cw_dbg_dmp(DBG_DTLS_BIO_DMP, (uint8_t *) out, maxlen, "Dump...");
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return maxlen;
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}
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memcpy(out, conn->dtls_buffer + conn->dtls_buffer_pos, conn->dtls_buffer_len);
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int ret = conn->dtls_buffer_len;
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conn->dtls_buffer_len = 0;
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cw_dbg(DBG_DTLS_BIO, "SSL BIO read: (maxlen = %d), read %d, remain %d", maxlen, ret,
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conn->dtls_buffer_len);
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cw_dbg_dmp(DBG_DTLS_BIO_DMP, (uint8_t *) out, ret, "Dump...");
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return ret;
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}
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/**
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* Write DTLS data to a CAPWAP connection.
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* @param conn the connection
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* @param data data to write
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* @param len number of bytes to write
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* @return the number of bytes written
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*/
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int dtls_bio_write(struct conn *conn, const char *data, int len)
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{
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uint8_t buffer[2048];
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*((uint32_t *) buffer) = htonl(1 << 24);
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memcpy(buffer + 4, data, len);
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int rc = conn->send_packet(conn, buffer, len + 4);
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if (rc>=0)
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rc-=4;
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cw_dbg(DBG_DTLS_BIO, "SSL BIO write: %d bytes, wrote=%d, ptr: %p", len, rc, data);
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cw_dbg_dmp(DBG_DTLS_BIO_DMP, (uint8_t *) data, len, "Dump ...");
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if (rc < 0)
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return rc;
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return rc ;
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}
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