svn commit: r187200 - stable/7/lib/libstand
Luigi Rizzo
luigi at FreeBSD.org
Tue Jan 13 14:46:26 PST 2009
Author: luigi
Date: Tue Jan 13 22:46:24 2009
New Revision: 187200
URL: http://svn.freebsd.org/changeset/base/187200
Log:
MFC from rev.185643 and 186799
Some libstand/bootp.c extension (written by Danny Braniss, slightly
revised/modified by me) to store dhcp options into kenv variables,
so the information is available to the boot loader and can be used
to customize the boot process.
Modified:
stable/7/lib/libstand/bootp.c
Modified: stable/7/lib/libstand/bootp.c
==============================================================================
--- stable/7/lib/libstand/bootp.c Tue Jan 13 22:35:26 2009 (r187199)
+++ stable/7/lib/libstand/bootp.c Tue Jan 13 22:46:24 2009 (r187200)
@@ -47,6 +47,12 @@ __FBSDID("$FreeBSD$");
#define BOOTP_DEBUGxx
#define SUPPORT_DHCP
+#define DHCP_ENV_NOVENDOR 1 /* do not parse vendor options */
+#define DHCP_ENV_PXE 10 /* assume pxe vendor options */
+#define DHCP_ENV_FREEBSD 11 /* assume freebsd vendor options
+/* set DHCP_ENV to one of the values above to export dhcp options to kenv */
+#define DHCP_ENV DHCP_ENV_NO_VENDOR
+
#include "stand.h"
#include "net.h"
#include "netif.h"
@@ -72,6 +78,13 @@ static int vend_rfc1048(u_char *, u_int)
static void vend_cmu(u_char *);
#endif
+#ifdef DHCP_ENV /* export the dhcp response to kenv */
+struct dhcp_opt;
+static void setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts);
+#else
+#define setenv_(a, b, c)
+#endif
+
#ifdef SUPPORT_DHCP
static char expected_dhcpmsgtype = -1, dhcp_ok;
struct in_addr dhcp_serverip;
@@ -351,6 +364,8 @@ vend_rfc1048(cp, len)
/* Step over magic cookie */
cp += sizeof(int);
+ setenv_(cp, ep, NULL);
+
while (cp < ep) {
tag = *cp++;
size = *cp++;
@@ -412,3 +427,316 @@ vend_cmu(cp)
}
}
#endif
+
+#ifdef DHCP_ENV
+/*
+ * Parse DHCP options and store them into kenv variables.
+ * Original code from Danny Braniss, modifications by Luigi Rizzo.
+ *
+ * The parser is driven by tables which specify the type and name of
+ * each dhcp option and how it appears in kenv.
+ * The first entry in the list contains the prefix used to set the kenv
+ * name (including the . if needed), the last entry must have a 0 tag.
+ * Entries do not need to be sorted though it helps for readability.
+ *
+ * Certain vendor-specific tables can be enabled according to DHCP_ENV.
+ * Set it to 0 if you don't want any.
+ */
+enum opt_fmt { __NONE = 0,
+ __8 = 1, __16 = 2, __32 = 4, /* Unsigned fields, value=size */
+ __IP, /* IPv4 address */
+ __TXT, /* C string */
+ __BYTES, /* byte sequence, printed %02x */
+ __INDIR, /* name=value */
+ __ILIST, /* name=value;name=value ... */
+ __VE, /* vendor specific, recurse */
+};
+
+struct dhcp_opt {
+ uint8_t tag;
+ uint8_t fmt;
+ const char *desc;
+};
+
+static struct dhcp_opt vndr_opt[] = { /* Vendor Specific Options */
+#if DHCP_ENV == DHCP_ENV_FREEBSD /* FreeBSD table in the original code */
+ {0, 0, "FreeBSD"}, /* prefix */
+ {1, __TXT, "kernel"},
+ {2, __TXT, "kernelname"},
+ {3, __TXT, "kernel_options"},
+ {4, __IP, "usr-ip"},
+ {5, __TXT, "conf-path"},
+ {6, __TXT, "rc.conf0"},
+ {7, __TXT, "rc.conf1"},
+ {8, __TXT, "rc.conf2"},
+ {9, __TXT, "rc.conf3"},
+ {10, __TXT, "rc.conf4"},
+ {11, __TXT, "rc.conf5"},
+ {12, __TXT, "rc.conf6"},
+ {13, __TXT, "rc.conf7"},
+ {14, __TXT, "rc.conf8"},
+ {15, __TXT, "rc.conf9"},
+
+ {20, __TXT, "boot.nfsroot.options"},
+
+ {245, __INDIR, ""},
+ {246, __INDIR, ""},
+ {247, __INDIR, ""},
+ {248, __INDIR, ""},
+ {249, __INDIR, ""},
+ {250, __INDIR, ""},
+ {251, __INDIR, ""},
+ {252, __INDIR, ""},
+ {253, __INDIR, ""},
+ {254, __INDIR, ""},
+
+#elif DHCP_ENV == DHCP_ENV_PXE /* some pxe options, RFC4578 */
+ {0, 0, "pxe"}, /* prefix */
+ {93, __16, "system-architecture"},
+ {94, __BYTES, "network-interface"},
+ {97, __BYTES, "machine-identifier"},
+#else /* default (empty) table */
+ {0, 0, "dhcp.vendor."}, /* prefix */
+#endif
+ {0, __TXT, "%soption-%d"}
+};
+
+static struct dhcp_opt dhcp_opt[] = {
+ /* DHCP Option names, formats and codes, from RFC2132. */
+ {0, 0, "dhcp."}, // prefix
+ {1, __IP, "subnet-mask"},
+ {2, __32, "time-offset"}, /* this is signed */
+ {3, __IP, "routers"},
+ {4, __IP, "time-servers"},
+ {5, __IP, "ien116-name-servers"},
+ {6, __IP, "domain-name-servers"},
+ {7, __IP, "log-servers"},
+ {8, __IP, "cookie-servers"},
+ {9, __IP, "lpr-servers"},
+ {10, __IP, "impress-servers"},
+ {11, __IP, "resource-location-servers"},
+ {12, __TXT, "host-name"},
+ {13, __16, "boot-size"},
+ {14, __TXT, "merit-dump"},
+ {15, __TXT, "domain-name"},
+ {16, __IP, "swap-server"},
+ {17, __TXT, "root-path"},
+ {18, __TXT, "extensions-path"},
+ {19, __8, "ip-forwarding"},
+ {20, __8, "non-local-source-routing"},
+ {21, __IP, "policy-filter"},
+ {22, __16, "max-dgram-reassembly"},
+ {23, __8, "default-ip-ttl"},
+ {24, __32, "path-mtu-aging-timeout"},
+ {25, __16, "path-mtu-plateau-table"},
+ {26, __16, "interface-mtu"},
+ {27, __8, "all-subnets-local"},
+ {28, __IP, "broadcast-address"},
+ {29, __8, "perform-mask-discovery"},
+ {30, __8, "mask-supplier"},
+ {31, __8, "perform-router-discovery"},
+ {32, __IP, "router-solicitation-address"},
+ {33, __IP, "static-routes"},
+ {34, __8, "trailer-encapsulation"},
+ {35, __32, "arp-cache-timeout"},
+ {36, __8, "ieee802-3-encapsulation"},
+ {37, __8, "default-tcp-ttl"},
+ {38, __32, "tcp-keepalive-interval"},
+ {39, __8, "tcp-keepalive-garbage"},
+ {40, __TXT, "nis-domain"},
+ {41, __IP, "nis-servers"},
+ {42, __IP, "ntp-servers"},
+ {43, __VE, "vendor-encapsulated-options"},
+ {44, __IP, "netbios-name-servers"},
+ {45, __IP, "netbios-dd-server"},
+ {46, __8, "netbios-node-type"},
+ {47, __TXT, "netbios-scope"},
+ {48, __IP, "x-font-servers"},
+ {49, __IP, "x-display-managers"},
+ {50, __IP, "dhcp-requested-address"},
+ {51, __32, "dhcp-lease-time"},
+ {52, __8, "dhcp-option-overload"},
+ {53, __8, "dhcp-message-type"},
+ {54, __IP, "dhcp-server-identifier"},
+ {55, __8, "dhcp-parameter-request-list"},
+ {56, __TXT, "dhcp-message"},
+ {57, __16, "dhcp-max-message-size"},
+ {58, __32, "dhcp-renewal-time"},
+ {59, __32, "dhcp-rebinding-time"},
+ {60, __TXT, "vendor-class-identifier"},
+ {61, __TXT, "dhcp-client-identifier"},
+ {64, __TXT, "nisplus-domain"},
+ {65, __IP, "nisplus-servers"},
+ {66, __TXT, "tftp-server-name"},
+ {67, __TXT, "bootfile-name"},
+ {68, __IP, "mobile-ip-home-agent"},
+ {69, __IP, "smtp-server"},
+ {70, __IP, "pop-server"},
+ {71, __IP, "nntp-server"},
+ {72, __IP, "www-server"},
+ {73, __IP, "finger-server"},
+ {74, __IP, "irc-server"},
+ {75, __IP, "streettalk-server"},
+ {76, __IP, "streettalk-directory-assistance-server"},
+ {77, __TXT, "user-class"},
+ {85, __IP, "nds-servers"},
+ {86, __TXT, "nds-tree-name"},
+ {87, __TXT, "nds-context"},
+ {210, __TXT, "authenticate"},
+
+ /* use the following entries for arbitrary variables */
+ {246, __ILIST, ""},
+ {247, __ILIST, ""},
+ {248, __ILIST, ""},
+ {249, __ILIST, ""},
+ {250, __INDIR, ""},
+ {251, __INDIR, ""},
+ {252, __INDIR, ""},
+ {253, __INDIR, ""},
+ {254, __INDIR, ""},
+ {0, __TXT, "%soption-%d"}
+};
+
+/*
+ * parse a dhcp response, set environment variables translating options
+ * names and values according to the tables above. Also set dhcp.tags
+ * to the list of selected tags.
+ */
+static void
+setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts)
+{
+ u_char *ncp;
+ u_char tag;
+ char tags[512], *tp; /* the list of tags */
+
+#define FLD_SEP ',' /* separator in list of elements */
+ ncp = cp;
+ tp = tags;
+ if (opts == NULL)
+ opts = dhcp_opt;
+
+ while (ncp < ep) {
+ unsigned int size; /* option size */
+ char *vp, *endv, buf[256]; /* the value buffer */
+ struct dhcp_opt *op;
+
+ tag = *ncp++; /* extract tag and size */
+ size = *ncp++;
+ cp = ncp; /* current payload */
+ ncp += size; /* point to the next option */
+
+ if (tag == TAG_END)
+ break;
+ if (tag == 0)
+ continue;
+
+ for (op = opts+1; op->tag && op->tag != tag; op++)
+ ;
+ /* if not found we end up on the default entry */
+
+ /*
+ * Copy data into the buffer. libstand does not have snprintf so we
+ * need to be careful with sprintf(). With strings, the source is
+ * always <256 char so shorter than the buffer so we are safe; with
+ * other arguments, the longest string is inet_ntoa which is 16 bytes
+ * so we make sure to have always enough room in the string before
+ * trying an sprint.
+ */
+ vp = buf;
+ *vp = '\0';
+ endv = buf + sizeof(buf) - 1 - 16; /* last valid write position */
+
+ switch(op->fmt) {
+ case __NONE:
+ break; /* should not happen */
+
+ case __VE: /* recurse, vendor specific */
+ setenv_(cp, cp+size, vndr_opt);
+ break;
+
+ case __IP: /* ip address */
+ for (; size > 0 && vp < endv; size -= 4, cp += 4) {
+ struct in_addr in_ip; /* ip addresses */
+ if (vp != buf)
+ *vp++ = FLD_SEP;
+ bcopy(cp, &in_ip.s_addr, sizeof(in_ip.s_addr));
+ sprintf(vp, "%s", inet_ntoa(in_ip));
+ vp += strlen(vp);
+ }
+ break;
+
+ case __BYTES: /* opaque byte string */
+ for (; size > 0 && vp < endv; size -= 1, cp += 1) {
+ sprintf(vp, "%02x", *cp);
+ vp += strlen(vp);
+ }
+ break;
+
+ case __TXT:
+ bcopy(cp, buf, size); /* cannot overflow */
+ buf[size] = 0;
+ break;
+
+ case __32:
+ case __16:
+ case __8: /* op->fmt is also the length of each field */
+ for (; size > 0 && vp < endv; size -= op->fmt, cp += op->fmt) {
+ uint32_t v;
+ if (op->fmt == __32)
+ v = (cp[0]<<24) + (cp[1]<<16) + (cp[2]<<8) + cp[3];
+ else if (op->fmt == __16)
+ v = (cp[0]<<8) + cp[1];
+ else
+ v = cp[0];
+ if (vp != buf)
+ *vp++ = FLD_SEP;
+ sprintf(vp, "%u", v);
+ vp += strlen(vp);
+ }
+ break;
+
+ case __INDIR: /* name=value */
+ case __ILIST: /* name=value;name=value... */
+ bcopy(cp, buf, size); /* cannot overflow */
+ buf[size] = '\0';
+ for (endv = buf; endv; endv = vp) {
+ u_char *s = NULL; /* semicolon ? */
+
+ /* skip leading whitespace */
+ while (*endv && index(" \t\n\r", *endv))
+ endv++;
+ vp = index(endv, '='); /* find name=value separator */
+ if (!vp)
+ break;
+ *vp++ = 0;
+ if (op->fmt == __ILIST && (s = index(vp, ';')))
+ *s++ = '\0';
+ setenv(endv, vp, 1);
+ vp = s; /* prepare for next round */
+ }
+ buf[0] = '\0'; /* option already done */
+ }
+
+ if (tp - tags < sizeof(tags) - 5) { /* add tag to the list */
+ if (tp != tags)
+ *tp++ = FLD_SEP;
+ sprintf(tp, "%d", tag);
+ tp += strlen(tp);
+ }
+ if (buf[0]) {
+ char env[128]; /* the string name */
+
+ if (op->tag == 0)
+ sprintf(env, op->desc, opts[0].desc, tag);
+ else
+ sprintf(env, "%s%s", opts[0].desc, op->desc);
+ setenv(env, buf, 1);
+ }
+ }
+ if (tp != tags) {
+ char env[128]; /* the string name */
+ sprintf(env, "%stags", opts[0].desc);
+ setenv(env, tags, 1);
+ }
+}
+#endif /* additional dhcp */
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