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added weak fnc add_custom_offer_options #8451

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added weak fnc add_custom_offer_options #8451

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5e130d6
added weak fnc add_custom_offer_options
bwjohns4 Jan 17, 2022
56c208c
formatted with restyle.sh
bwjohns4 Jan 18, 2022
eb41fdf
Merge branch 'master' into addCustomDHCPoptions
d-a-v May 12, 2022
6acfe9a
Merge branch 'master' into addCustomDHCPoptions
bwjohns4 May 13, 2022
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17 changes: 17 additions & 0 deletions cores/esp8266/LwipDhcpServer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -373,6 +373,21 @@ uint8_t* DhcpServer::add_msg_type(uint8_t* optptr, uint8_t type)
*optptr++ = type;
return optptr;
}

extern "C" uint8_t* __add_custom_offer_options(uint8_t *optptr)
{
// Example showing how to add Captive Portal Option to DHCP Server
// *optptr++ = 114;
// *optptr++ = 19;
// char captive_uri[] = "http://192.168.4.1/";
// for(int i = 0; i<19; i++){
// *optptr++ = captive_uri[i];
// }

return optptr; //do nothing by default. Libraries can then redefine this weak function in order to hook into DHCP server options
}
extern "C" uint8_t* add_custom_offer_options(uint8_t *optptr) __attribute__((weak, alias("__add_custom_offer_options")));

///////////////////////////////////////////////////////////////////////////////////
/*
DHCP msg offer
Expand Down Expand Up @@ -475,6 +490,8 @@ uint8_t* DhcpServer::add_offer_options(uint8_t* optptr)
*optptr++ = 2;
#endif

optptr = add_custom_offer_options(optptr); //this allows external code to redefine this weak function and hook into DHCP Offer.

return optptr;

#undef ipadd
Expand Down