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View Code? Open in Web Editor NEWA simple DHCP client
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OS X compilation issue
On running make on OS X Yosemite, I see the error dump below
dhcp-client.c:153:36: error: incomplete definition of type 'struct sockaddr_dl'
memcpy((void *)mac, sdp->sdl_data + sdp->sdl_nlen, 6);
~~~^
/usr/include/secure/_string.h:65:33: note: expanded from macro 'memcpy'
__builtin___memcpy_chk (dest, src, len, __darwin_obsz0 (dest))
^~~
dhcp-client.c:150:20: note: forward declaration of 'struct sockaddr_dl'
struct sockaddr_dl* sdp;
^
dhcp-client.c:153:52: error: incomplete definition of type 'struct sockaddr_dl'
memcpy((void *)mac, sdp->sdl_data + sdp->sdl_nlen, 6);
~~~^
/usr/include/secure/_string.h:65:33: note: expanded from macro 'memcpy'
__builtin___memcpy_chk (dest, src, len, __darwin_obsz0 (dest))
^~~
dhcp-client.c:150:20: note: forward declaration of 'struct sockaddr_dl'
struct sockaddr_dl* sdp;
^
dhcp-client.c:286:24: warning: implicit conversion from '__uint32_t' (aka 'unsigned int') to 'u_short' (aka 'unsigned short')
changes value from 4294901760 to 0 [-Wconstant-conversion]
ip_header->ip_id = htonl(0xffff);
~ ^~~~~~~~~~~~~
/usr/include/sys/_endian.h:136:18: note: expanded from macro 'htonl'
#define htonl(x) __DARWIN_OSSwapInt32(x)
^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/libkern/_OSByteOrder.h:75:32: note: expanded from macro '__DARWIN_OSSwapInt32'
(__builtin_constant_p(x) ? __DARWIN_OSSwapConstInt32(x) : _OSSwapInt32(x))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/libkern/_OSByteOrder.h:48:6: note: expanded from macro '__DARWIN_OSSwapConstInt32'
((__uint32_t)((((__uint32_t)(x) & 0xff000000) >> 24) | \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dhcp-client.c:387:18: warning: passing 'char [4096]' to parameter of type 'u_char *' (aka 'unsigned char *') converts between
pointers to integer types with different sign [-Wpointer-sign]
ether_output(packet, mac, len);
^~~~~~
dhcp-client.c:256:22: note: passing argument to parameter 'frame' here
ether_output(u_char *frame, u_int8_t *mac, int len)
^
2 warnings and 2 errors generated.
make: *** [dhcp-client] Error 1
small problem
Hi，How do I get the client to send something other than a broadcast packet
Some error
Hi,
I think there is an error in dhcp_input function.
It should be
if (dhcp->opcode != DHCP_OPTION_OFFER) -> if (dhcp->opcode != DHCP_BOOTREPLY)
And there are some defines error.
#define DHCP_OPTION_DECLINE 4
#define DHCP_OPTION_PACK 4->5
Anyway, thank you for your sharing, it helps me to understand DHCP behavior :)
Thanks,
g548462
[Enhancement] Can the source be modified for DHCPREQUEST & DHCPACK
Currently, the client does discovery & then wait for the offer from the server. My Openwrt router shows following lines when I launch the client
Sun Oct 9 05:04:08 2016 daemon.info dnsmasq-dhcp[1828]: DHCPDISCOVER(br-lan) 192.168.1.10 02:f6:01:6f:ca:95
Sun Oct 9 05:04:08 2016 daemon.info dnsmasq-dhcp[1828]: DHCPOFFER(br-lan) 192.168.7.113 02:f6:01:6f:ca:95
I am working on writing a network client that does DHCP to the server. When an actual network client connects, I see the following logs on the router
Sun Oct 9 05:03:16 2016 daemon.info dnsmasq-dhcp[1828]: DHCPREQUEST(br-lan) 192.168.7.173 dc:41:5f:9d:76:49
Sun Oct 9 05:03:16 2016 daemon.info dnsmasq-dhcp[1828]: DHCPACK(br-lan) 192.168.7.173 dc:41:5f:9d:76:49 M1036381siPhone
Can you pass me some reference material so that I can modify the source for the above sequence to be followed when the client spawns rather discovery & offer. I think that way, this client would be close to an actual dhcp client.
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