d72b24a2fe
Handle EAGAIN and EWOULDBLOCK more gracefully when dealing with safe_read(). All occurrences of safe_read() should only be invoked on fds that have signaled ready-to-read state via the epoll() mechanism, so this change should not result in any observable difference, but it is best to be safe. Additionally, a constant stack variable is converted to an equivalent macro define for cleanliness. Finally, print the error type encountered if reading data from an ARP response fails with a read error.
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* dhcpmsg.c - dhcp packet generation and sending functions
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* Time-stamp: <2011-03-31 03:27:02 nk>
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*
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* (c) 2004-2011 Nicholas J. Kain <njkain at gmail dot com>
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* (c) 2001 Russ Dill <Russ.Dill@asu.edu>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef DHCPMSG_H_
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#define DHCPMSG_H_
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#include <stdint.h>
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#include "packet.h"
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#define DHCP_SERVER_PORT 67
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#define DHCP_CLIENT_PORT 68
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#define DHCP_MAGIC 0x63825363
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enum {
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DHCPDISCOVER = 1,
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DHCPOFFER = 2,
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DHCPREQUEST = 3,
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DHCPDECLINE = 4,
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DHCPACK = 5,
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DHCPNAK = 6,
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DHCPRELEASE = 7,
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DHCPINFORM = 8
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};
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uint32_t random_xid(void);
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int send_discover(uint32_t xid, uint32_t requested);
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int send_selecting(uint32_t xid, uint32_t server, uint32_t requested);
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int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr);
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int send_decline(uint32_t xid, uint32_t server, uint32_t requested);
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int send_release(uint32_t server, uint32_t ciaddr);
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int get_raw_packet(struct dhcpMessage *payload, int fd);
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#endif
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