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Add hostname option to DHCP messages - sdhcp - simple dhcp client |
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git clone git://git.codemadness.org/sdhcp |
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LICENSE |
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--- |
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commit 9cd8b81473192dc0bc5476fba506d0ee995f6494 |
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parent fafdfd63ff3595a27718bd3a44a35488f1282d33 |
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Author: Michael Forney <[email protected]> |
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Date: Wed, 14 Nov 2018 18:40:41 -0800 |
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Add hostname option to DHCP messages |
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Diffstat: |
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M sdhcp.c | 7 +++++++ |
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1 file changed, 7 insertions(+), 0 deletions(-) |
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--- |
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diff --git a/sdhcp.c b/sdhcp.c |
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@@ -8,6 +8,7 @@ |
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#include <errno.h> |
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#include <fcntl.h> |
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+#include <limits.h> |
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#include <poll.h> |
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#include <signal.h> |
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#include <stdint.h> |
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@@ -62,6 +63,7 @@ enum { |
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OBrouter = 3, |
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OBnameserver = 5, |
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OBdnsserver = 6, |
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+ OBhostname = 12, |
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OBbaddr = 28, |
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ODipaddr = 50, /* 0x32 */ |
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ODlease = 51, |
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@@ -88,6 +90,7 @@ unsigned char magic[] = { 99, 130, 83, 99 }; |
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/* conf */ |
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static unsigned char xid[sizeof(bp.xid)]; |
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static unsigned char hwaddr[16]; |
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+static char hostname[HOST_NAME_MAX + 1]; |
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static time_t starttime; |
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static char *ifname = "eth0"; |
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static unsigned char cid[16]; |
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@@ -278,6 +281,7 @@ dhcpsend(int type, int how) |
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p = bp.optdata; |
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p = hnoptput(p, ODtype, type, 1); |
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p = optput(p, ODclientid, cid, sizeof(cid)); |
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+ p = optput(p, OBhostname, (unsigned char *)hostname, strlen(hostname)); |
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switch (type) { |
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case DHCPdiscover: |
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@@ -542,6 +546,9 @@ main(int argc, char *argv[]) |
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memset(&ifreq, 0, sizeof(ifreq)); |
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signal(SIGTERM, cleanexit); |
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+ if (gethostname(hostname, sizeof(hostname)) == -1) |
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+ eprintf("gethostname:"); |
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+ |
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if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) |
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eprintf("socket:"); |
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if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &bcast, sizeof(bcast)) … |
