mirror of
https://github.com/warmcat/libwebsockets.git
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5bcc5ac655
Introduce a LWS_WITH_WOL and an api to wake a mac address, optionally with an address bind to the local interface to go out on. Add a helper to parse ascii mac addresses well, and add tests.
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2023 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "private-lib-core.h"
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int
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lws_wol(struct lws_context *ctx, const char *ip_or_NULL, uint8_t *mac_6_bytes)
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{
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int n, m, ofs = 0, fd, optval = 1, ret = 1;
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uint8_t pkt[17 * IFHWADDRLEN];
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struct sockaddr_in addr;
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fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (fd < 0) {
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lwsl_cx_err(ctx, "failed to open UDP, errno %d\n", errno);
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goto bail;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST,
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(char *)&optval, sizeof(optval)) < 0) {
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lwsl_cx_err(ctx, "failed to set broadcast, errno %d\n", errno);
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goto bail;
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}
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/*
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* Lay out the magic packet
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*/
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for (n = 0; n < IFHWADDRLEN; n++)
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pkt[ofs++] = 0xff;
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for (m = 0; m < 16; m++)
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for (n = 0; n < IFHWADDRLEN; n++)
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pkt[ofs++] = mac_6_bytes[n];
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(9);
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if (!inet_aton(ip_or_NULL ? ip_or_NULL : "255.255.255.255",
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&addr.sin_addr)) {
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lwsl_cx_err(ctx, "failed to convert broadcast ads, errno %d\n",
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errno);
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goto bail;
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}
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lwsl_cx_notice(ctx, "Sending WOL to %02X:%02X:%02X:%02X:%02X:%02X %s\n",
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mac_6_bytes[0], mac_6_bytes[1], mac_6_bytes[2], mac_6_bytes[3],
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mac_6_bytes[4], mac_6_bytes[5], ip_or_NULL ? ip_or_NULL : "");
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if (sendto(fd, pkt, sizeof(pkt), 0, (struct sockaddr *)&addr,
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sizeof(addr)) < 0) {
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lwsl_cx_err(ctx, "failed to sendto broadcast ads, errno %d\n",
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errno);
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goto bail;
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}
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ret = 0;
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bail:
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close(fd);
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return ret;
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}
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