Add a readonly sysctl variable of type string, kern.bootp_cookie,
which is initialized with whatever string a dhcp/bootp server passes as vendor tag 134. There is no standard tag that I know with this information, and no vendor-defined tag that applies to FreeBSD that I could find doing the same thing. The intended use is to pass information to userland for run-time configuration of a diskless client without having to run a bootp/dhcp client for the third time (after the one in pxeboot/etherboot, and the one in the kernel bootp), also because these clients generally screwup the interface configuration, which is not exactly what you want when you have your disks nfs-mounted. Manpage update to follow soon. MFC-after: 3 days
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=92219
@ -55,6 +55,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/proc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/uio.h>
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#include <net/if.h>
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@ -197,6 +198,7 @@ struct bootpc_globalcontext {
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#define TAG_SWAPSIZE 129
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#define TAG_ROOTOPTS 130
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#define TAG_SWAPOPTS 131
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#define TAG_COOKIE 134 /* ascii info for userland, via sysctl */
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#define TAG_DHCP_MSGTYPE 53
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#define TAG_DHCP_REQ_ADDR 50
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@ -209,6 +211,10 @@ struct bootpc_globalcontext {
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#define DHCP_REQUEST 3
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#define DHCP_ACK 5
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static char bootp_cookie[128];
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SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
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bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
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/* mountd RPC */
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static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
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int *fhsizep, struct nfs_args *args, struct thread *td);
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@ -1607,6 +1613,15 @@ bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
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gctx->sethostname = ifctx;
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}
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}
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p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
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TAG_COOKIE);
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if (p != NULL) { /* store in a sysctl variable */
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int i, l = sizeof(bootp_cookie) - 1;
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for (i = 0; i < l && p[i] != '\0'; i++)
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bootp_cookie[i] = p[i];
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p[i] = '\0';
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}
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printf("\n");
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