diff options
Diffstat (limited to 'usr/src/boot/libsa/bootp.c')
| -rw-r--r-- | usr/src/boot/libsa/bootp.c | 779 |
1 files changed, 779 insertions, 0 deletions
diff --git a/usr/src/boot/libsa/bootp.c b/usr/src/boot/libsa/bootp.c new file mode 100644 index 0000000000..080e90d7a5 --- /dev/null +++ b/usr/src/boot/libsa/bootp.c @@ -0,0 +1,779 @@ +/* + * Copyright (c) 1992 Regents of the University of California. + * All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> + +#include <stddef.h> +#include <sys/types.h> +#include <sys/limits.h> +#include <sys/endian.h> +#include <netinet/in.h> +#include <netinet/in_systm.h> + +#include <string.h> + +#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" +#include "bootp.h" + + +struct in_addr servip; + +static time_t bot; + +static char vm_rfc1048[4] = VM_RFC1048; +#ifdef BOOTP_VEND_CMU +static char vm_cmu[4] = VM_CMU; +#endif + +/* Local forwards */ +static ssize_t bootpsend(struct iodesc *, void *, size_t); +static ssize_t bootprecv(struct iodesc *, void **, void **, time_t, void *); +static int vend_rfc1048(uchar_t *, uint_t); +#ifdef BOOTP_VEND_CMU +static void vend_cmu(uchar_t *); +#endif + +#ifdef DHCP_ENV /* export the dhcp response to kenv */ +struct dhcp_opt; +static void setenv_(uchar_t *cp, uchar_t *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; +#endif +struct bootp *bootp_response; +size_t bootp_response_size; + +static void +bootp_fill_request(unsigned char *bp_vend) +{ + /* + * We are booting from PXE, we want to send the string + * 'PXEClient' to the DHCP server so you have the option of + * only responding to PXE aware dhcp requests. + */ + bp_vend[0] = TAG_CLASSID; + bp_vend[1] = 9; + bcopy("PXEClient", &bp_vend[2], 9); + bp_vend[11] = TAG_USER_CLASS; + /* len of each user class + number of user class */ + bp_vend[12] = 8; + /* len of the first user class */ + bp_vend[13] = 7; + bcopy("illumos", &bp_vend[14], 7); + bp_vend[21] = TAG_PARAM_REQ; + bp_vend[22] = 7; + bp_vend[23] = TAG_SUBNET_MASK; + bp_vend[24] = TAG_GATEWAY; + bp_vend[25] = TAG_HOSTNAME; + bp_vend[26] = TAG_SWAPSERVER; + bp_vend[27] = TAG_ROOTPATH; + bp_vend[28] = TAG_INTF_MTU; + bp_vend[29] = TAG_SERVERID; + bp_vend[30] = TAG_END; +} + +/* Fetch required bootp infomation */ +void +bootp(int sock) +{ + void *pkt; + struct iodesc *d; + struct bootp *bp; + struct { + uchar_t header[HEADER_SIZE]; + struct bootp wbootp; + } wbuf; + struct bootp *rbootp; + +#ifdef BOOTP_DEBUG + if (debug) + printf("bootp: socket=%d\n", sock); +#endif + if (!bot) + bot = getsecs(); + + if (!(d = socktodesc(sock))) { + printf("bootp: bad socket. %d\n", sock); + return; + } +#ifdef BOOTP_DEBUG + if (debug) + printf("bootp: d=%lx\n", (long)d); +#endif + + bp = &wbuf.wbootp; + bzero(bp, sizeof (*bp)); + + bp->bp_op = BOOTREQUEST; + bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */ + bp->bp_hlen = 6; + bp->bp_xid = htonl(d->xid); + MACPY(d->myea, bp->bp_chaddr); + strncpy(bp->bp_file, bootfile, sizeof (bp->bp_file)); + bcopy(vm_rfc1048, bp->bp_vend, sizeof (vm_rfc1048)); +#ifdef SUPPORT_DHCP + bp->bp_vend[4] = TAG_DHCP_MSGTYPE; + bp->bp_vend[5] = 1; + bp->bp_vend[6] = DHCPDISCOVER; + bootp_fill_request(&bp->bp_vend[7]); +#else + bp->bp_vend[4] = TAG_END; +#endif + + d->myip.s_addr = INADDR_ANY; + d->myport = htons(IPPORT_BOOTPC); + d->destip.s_addr = INADDR_BROADCAST; + d->destport = htons(IPPORT_BOOTPS); + +#ifdef SUPPORT_DHCP + expected_dhcpmsgtype = DHCPOFFER; + dhcp_ok = 0; +#endif + + if (sendrecv(d, bootpsend, bp, sizeof (*bp), + bootprecv, &pkt, (void **)&rbootp, NULL) == -1) { + printf("bootp: no reply\n"); + return; + } + +#ifdef SUPPORT_DHCP + if (dhcp_ok) { + uint32_t leasetime; + bp->bp_vend[6] = DHCPREQUEST; + bp->bp_vend[7] = TAG_REQ_ADDR; + bp->bp_vend[8] = 4; + bcopy(&rbootp->bp_yiaddr, &bp->bp_vend[9], 4); + bp->bp_vend[13] = TAG_SERVERID; + bp->bp_vend[14] = 4; + bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4); + bp->bp_vend[19] = TAG_LEASETIME; + bp->bp_vend[20] = 4; + leasetime = htonl(300); + bcopy(&leasetime, &bp->bp_vend[21], 4); + bootp_fill_request(&bp->bp_vend[25]); + + expected_dhcpmsgtype = DHCPACK; + + free(pkt); + if (sendrecv(d, bootpsend, bp, sizeof (*bp), + bootprecv, &pkt, (void **)&rbootp, NULL) == -1) { + printf("DHCPREQUEST failed\n"); + return; + } + } +#endif + + myip = d->myip = rbootp->bp_yiaddr; + servip = rbootp->bp_siaddr; + if (rootip.s_addr == INADDR_ANY) + rootip = servip; + bcopy(rbootp->bp_file, bootfile, sizeof (bootfile)); + bootfile[sizeof (bootfile) - 1] = '\0'; + + if (!netmask) { + if (IN_CLASSA(ntohl(myip.s_addr))) + netmask = htonl(IN_CLASSA_NET); + else if (IN_CLASSB(ntohl(myip.s_addr))) + netmask = htonl(IN_CLASSB_NET); + else + netmask = htonl(IN_CLASSC_NET); +#ifdef BOOTP_DEBUG + if (debug) + printf("'native netmask' is %s\n", intoa(netmask)); +#endif + } + +#ifdef BOOTP_DEBUG + if (debug) + printf("mask: %s\n", intoa(netmask)); +#endif + + /* We need a gateway if root is on a different net */ + if (!SAMENET(myip, rootip, netmask)) { +#ifdef BOOTP_DEBUG + if (debug) + printf("need gateway for root ip\n"); +#endif + } + + /* Toss gateway if on a different net */ + if (!SAMENET(myip, gateip, netmask)) { +#ifdef BOOTP_DEBUG + if (debug) + printf("gateway ip (%s) bad\n", inet_ntoa(gateip)); +#endif + gateip.s_addr = 0; + } + + /* Bump xid so next request will be unique. */ + ++d->xid; + free(pkt); +} + +/* Transmit a bootp request */ +static ssize_t +bootpsend(struct iodesc *d, void *pkt, size_t len) +{ + struct bootp *bp; + +#ifdef BOOTP_DEBUG + if (debug) + printf("bootpsend: d=%lx called.\n", (long)d); +#endif + + bp = pkt; + bp->bp_secs = htons((ushort_t)(getsecs() - bot)); + +#ifdef BOOTP_DEBUG + if (debug) + printf("bootpsend: calling sendudp\n"); +#endif + + return (sendudp(d, pkt, len)); +} + +static ssize_t +bootprecv(struct iodesc *d, void **pkt, void **payload, time_t tleft, + void *extra __unused) +{ + ssize_t n; + struct bootp *bp; + void *ptr; + +#ifdef BOOTP_DEBUG + if (debug) + printf("bootp_recvoffer: called\n"); +#endif + + ptr = NULL; + n = readudp(d, &ptr, (void **)&bp, tleft); + if (n == -1 || n < sizeof (struct bootp) - BOOTP_VENDSIZE) + goto bad; + +#ifdef BOOTP_DEBUG + if (debug) + printf("bootprecv: checked. bp = %p, n = %zd\n", bp, n); +#endif + if (bp->bp_xid != htonl(d->xid)) { +#ifdef BOOTP_DEBUG + if (debug) { + printf("bootprecv: expected xid 0x%lx, got 0x%x\n", + d->xid, ntohl(bp->bp_xid)); + } +#endif + goto bad; + } + +#ifdef BOOTP_DEBUG + if (debug) + printf("bootprecv: got one!\n"); +#endif + + /* Suck out vendor info */ + if (bcmp(vm_rfc1048, bp->bp_vend, sizeof (vm_rfc1048)) == 0) { + int vsize = n - offsetof(struct bootp, bp_vend); + if (vend_rfc1048(bp->bp_vend, vsize) != 0) + goto bad; + + /* Save copy of bootp reply or DHCP ACK message */ + if (bp->bp_op == BOOTREPLY && + ((dhcp_ok == 1 && expected_dhcpmsgtype == DHCPACK) || + dhcp_ok == 0)) { + free(bootp_response); + bootp_response = malloc(n); + if (bootp_response != NULL) { + bootp_response_size = n; + bcopy(bp, bootp_response, bootp_response_size); + } + } + } +#ifdef BOOTP_VEND_CMU + else if (bcmp(vm_cmu, bp->bp_vend, sizeof (vm_cmu)) == 0) + vend_cmu(bp->bp_vend); +#endif + else + printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend); + + *pkt = ptr; + *payload = bp; + return (n); +bad: + free(ptr); + errno = 0; + return (-1); +} + +static int +vend_rfc1048(uchar_t *cp, uint_t len) +{ + uchar_t *ep; + int size; + uchar_t tag; + const char *val; + +#ifdef BOOTP_DEBUG + if (debug) + printf("vend_rfc1048 bootp info. len=%d\n", len); +#endif + ep = cp + len; + + /* Step over magic cookie */ + cp += sizeof (int); + + setenv_(cp, ep, NULL); + + while (cp < ep) { + tag = *cp++; + size = *cp++; + if (tag == TAG_END) + break; + + if (tag == TAG_SUBNET_MASK) { + bcopy(cp, &netmask, sizeof (netmask)); + } + if (tag == TAG_GATEWAY) { + bcopy(cp, &gateip.s_addr, sizeof (gateip.s_addr)); + } + if (tag == TAG_SWAPSERVER) { + /* let it override bp_siaddr */ + bcopy(cp, &rootip.s_addr, sizeof (rootip.s_addr)); + } + if (tag == TAG_ROOTPATH) { + if ((val = getenv("dhcp.root-path")) == NULL) + val = (const char *)cp; + strlcpy(rootpath, val, sizeof (rootpath)); + } + if (tag == TAG_HOSTNAME) { + if ((val = getenv("dhcp.host-name")) == NULL) + val = (const char *)cp; + strlcpy(hostname, val, sizeof (hostname)); + } + if (tag == TAG_INTF_MTU) { + intf_mtu = 0; + if ((val = getenv("dhcp.interface-mtu")) != NULL) { + unsigned long tmp; + char *end; + + errno = 0; + /* + * Do not allow MTU to exceed max IPv4 packet + * size, max value of 16-bit word. + */ + tmp = strtoul(val, &end, 0); + if (errno != 0 || + *val == '\0' || *end != '\0' || + tmp > USHRT_MAX) { + printf("%s: bad value: \"%s\", " + "ignoring\n", + "dhcp.interface-mtu", val); + } else { + intf_mtu = (uint_t)tmp; + } + } + if (intf_mtu == 0) + intf_mtu = be16dec(cp); + } +#ifdef SUPPORT_DHCP + if (tag == TAG_DHCP_MSGTYPE) { + if (*cp != expected_dhcpmsgtype) + return (-1); + dhcp_ok = 1; + } + if (tag == TAG_SERVERID) { + bcopy(cp, &dhcp_serverip.s_addr, + sizeof (dhcp_serverip.s_addr)); + } +#endif + cp += size; + } + return (0); +} + +#ifdef BOOTP_VEND_CMU +static void +vend_cmu(uchar_t *cp) +{ + struct cmu_vend *vp; + +#ifdef BOOTP_DEBUG + if (debug) + printf("vend_cmu bootp info.\n"); +#endif + vp = (struct cmu_vend *)cp; + + if (vp->v_smask.s_addr != 0) { + netmask = vp->v_smask.s_addr; + } + if (vp->v_dgate.s_addr != 0) { + gateip = vp->v_dgate; + } +} +#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_(uchar_t *cp, uchar_t *ep, struct dhcp_opt *opts) +{ + uchar_t *ncp; + uchar_t 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'; + /* last valid write position */ + endv = buf + sizeof (buf) - 1 - 16; + + 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) { + char *s = NULL; /* semicolon ? */ + + /* skip leading whitespace */ + while (*endv && strchr(" \t\n\r", *endv)) + endv++; + /* find name=value separator */ + vp = strchr(endv, '='); + if (!vp) + break; + *vp++ = 0; + if (op->fmt == __ILIST && (s = strchr(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); + /* + * Do not replace existing values in the environment, + * so that locally-obtained values can override + * server-provided values. + */ + setenv(env, buf, 0); + } + } + if (tp != tags) { + char env[128]; /* the string name */ + sprintf(env, "%stags", opts[0].desc); + setenv(env, tags, 1); + } +} +#endif /* additional dhcp */ |