commands/dhcpd/tags.c
C | 924 lines | 776 code | 86 blank | 62 comment | 370 complexity | 94385c0200d8d890287f927d065d1e66 MD5 | raw file
Possible License(s): MIT, WTFPL, AGPL-1.0, BSD-3-Clause, GPL-3.0, LGPL-2.0, JSON, 0BSD
- /* tags.c - Obtain DHCP tags from the config file
- * Author: Kees J. Bot
- * 16 Dec 2000
- */
- #include <sys/types.h>
- #include <stdio.h>
- #include <stddef.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <fcntl.h>
- #include <errno.h>
- #include <signal.h>
- #include <string.h>
- #include <time.h>
- #include <limits.h>
- #include <configfile.h>
- #include <sys/ioctl.h>
- #include <sys/asynchio.h>
- #include <net/hton.h>
- #include <net/gen/socket.h>
- #include <net/gen/netdb.h>
- #include <net/gen/in.h>
- #include <net/gen/inet.h>
- #include <net/gen/ether.h>
- #include <net/gen/if_ether.h>
- #include <net/gen/eth_hdr.h>
- #include <net/gen/ip_hdr.h>
- #include <net/gen/udp.h>
- #include <net/gen/udp_hdr.h>
- #include <net/gen/dhcp.h>
- #include "dhcpd.h"
- #define doff(field) offsetof(dhcp_t, field)
- void settag(dhcp_t *dp, int tag, void *data, size_t len)
- {
- if (!dhcp_settag(dp, tag, data, len)) {
- /* Oops, it didn't fit? Is this really Minix??? */
- fprintf(stderr,
- "%s: DHCP packet too big, please trim the configuration\n",
- program);
- exit(1);
- }
- }
- static int name2ip(ipaddr_t *pip, const char *name, ipaddr_t ifip)
- {
- /* Translate a name to an IP address, preferably from the hosts file,
- * but also from the DNS if being a server. Prefer the address closest
- * to the interface with IP address 'ifip' if there are choices..
- */
- extern struct hostent *_gethostent(void); /* File reading versions. */
- extern void _endhostent(void);
- struct hostent *he;
- size_t len= strlen(name);
- u32_t d, distance= -1;
- ipaddr_t ip;
- int i;
- char *hn;
- /* Already an IP address? */
- if (inet_aton(name, pip)) return 1;
- /* In the hosts file? */
- while ((he= _gethostent()) != nil) {
- hn= he->h_name;
- i= -1;
- do {
- if (strncasecmp(name, hn, len) == 0
- && (hn[len] == 0 || hn[len] == '.')
- ) {
- memcpy(&ip, he->h_addr, sizeof(ip));
- d= ntohl(ip) ^ ntohl(ifip);
- if (d < distance) {
- *pip= ip;
- distance= d;
- }
- break;
- }
- } while ((hn= he->h_aliases[++i]) != nil);
- }
- _endhostent();
- if (distance < -1) return 1;
- /* Nothing? Try the real DNS if being a server. */
- if (serving) {
- if ((he= gethostbyname(name)) != nil && he->h_addrtype == AF_INET) {
- /* Select the address closest to 'ifip'. */
- for (i= 0; he->h_addr_list[i] != nil; i++) {
- memcpy(&ip, he->h_addr_list[i], sizeof(ip));
- d= ntohl(ip) ^ ntohl(ifip);
- if (d < distance) {
- *pip= ip;
- distance= d;
- }
- }
- return 1;
- }
- }
- return 0;
- }
- static char *ip2name(ipaddr_t ip)
- {
- /* Translate an IP address to a name, etc, etc. */
- extern struct hostent *_gethostent(void); /* File reading versions. */
- extern void _endhostent(void);
- struct hostent *he;
- /* In the hosts file? */
- while ((he= _gethostent()) != nil) {
- if (memcmp(he->h_addr, &ip, sizeof(ip)) == 0) break;
- }
- _endhostent();
- /* Nothing? Try the real DNS if being a server. */
- if (he == nil && serving) {
- he= gethostbyaddr((char *) &ip, sizeof(ip), AF_INET);
- }
- return he != nil ? he->h_name : nil;
- }
- static int cidr_aton(const char *cidr, ipaddr_t *addr, ipaddr_t *mask)
- {
- char *slash, *check;
- ipaddr_t a;
- int ok;
- unsigned long len;
- if ((slash= strchr(cidr, '/')) == nil) return 0;
- *slash++= 0;
- ok= inet_aton(cidr, &a);
- len= strtoul(slash, &check, 10);
- if (check == slash || *check != 0 || len > 32) ok= 0;
- *--slash= '/';
- if (!ok) return 0;
- *addr= a;
- *mask= htonl(len == 0 ? 0 : (0xFFFFFFFFUL << (32-len)) & 0xFFFFFFFFUL);
- return 1;
- }
- char *cidr_ntoa(ipaddr_t addr, ipaddr_t mask)
- {
- ipaddr_t testmask= 0xFFFFFFFFUL;
- int n;
- static char result[sizeof("255.255.255.255/255.255.255.255")];
- for (n= 32; n >= 0; n--) {
- if (mask == htonl(testmask)) break;
- testmask= (testmask << 1) & 0xFFFFFFFFUL;
- }
- sprintf(result, "%s/%-2d", inet_ntoa(addr), n);
- if (n == -1) strcpy(strchr(result, '/')+1, inet_ntoa(mask));
- return result;
- }
- static size_t ascii2octet(u8_t *b, size_t size, const char *a)
- {
- /* Convert a series of hex digit pairs to an octet (binary) array at
- * 'b' with length 'size'. Return the number of octets in 'a' or
- * -1 on error.
- */
- size_t len;
- int n, c;
- len= 0;
- n= 0;
- while ((c= *a++) != 0) {
- if (between('0', c, '9')) c= (c - '0') + 0x0;
- else
- if (between('a', c, 'f')) c= (c - 'a') + 0xa;
- else
- if (between('A', c, 'F')) c= (c - 'A') + 0xA;
- else {
- return -1;
- }
- if (n == 0) {
- if (len < size) b[len] = c << 4;
- } else {
- if (len < size) b[len] |= c;
- len++;
- }
- n ^= 1;
- }
- return n == 0 ? len : -1;
- }
- void ether2clid(u8_t *clid, ether_addr_t *eth)
- {
- /* Convert an Ethernet address to the default client ID form. */
- clid[0]= DHCP_HTYPE_ETH;
- memcpy(clid+1, eth, DHCP_HLEN_ETH);
- }
- static size_t ascii2clid(u8_t *clid, const char *a)
- {
- /* Convert an ethernet address, or a series of hex digits to a client ID.
- * Return its length if ok, otherwise -1.
- */
- size_t len;
- ether_addr_t *eth;
- if ((eth= ether_aton(a)) != nil) {
- ether2clid(clid, eth);
- len= 1+DHCP_HLEN_ETH;
- } else {
- len= ascii2octet(clid, CLID_MAX, a);
- }
- return len;
- }
- static config_t *dhcpconf; /* In-core DHCP configuration. */
- /* DHCP tag types. */
- typedef enum { TT_ASCII, TT_BOOLEAN, TT_IP, TT_NUMBER, TT_OCTET } tagtype_t;
- /* DHCP/BOOTP tag definitions. */
- typedef struct tagdef {
- u8_t tag; /* Tag number. */
- u8_t type; /* Type and flags. */
- u8_t gran; /* Granularity. */
- u8_t max; /* Maximum number of arguments. */
- const char *name; /* Defined name. */
- } tagdef_t;
- #define TF_TYPE 0x07 /* To mask out the type. */
- #define TF_STATIC 0x08 /* "Static", i.e. a struct field. */
- #define TF_RO 0x10 /* Read-only, user can't set. */
- /* List of static DHCP fields. The tag field is misused here as an offset
- * into the DHCP structure.
- */
- static tagdef_t statictag[] = {
- { doff(op), TT_NUMBER|TF_STATIC|TF_RO, 1, 1, "op" },
- { doff(htype), TT_NUMBER|TF_STATIC|TF_RO, 1, 1, "htype" },
- { doff(hlen), TT_NUMBER|TF_STATIC|TF_RO, 1, 1, "hlen" },
- { doff(hops), TT_NUMBER|TF_STATIC|TF_RO, 1, 1, "hops" },
- { doff(xid), TT_NUMBER|TF_STATIC|TF_RO, 4, 1, "xid" },
- { doff(secs), TT_NUMBER|TF_STATIC|TF_RO, 2, 1, "secs" },
- { doff(flags), TT_NUMBER|TF_STATIC|TF_RO, 2, 1, "flags" },
- { doff(ciaddr), TT_IP|TF_STATIC|TF_RO, 1, 1, "ciaddr" },
- { doff(yiaddr), TT_IP|TF_STATIC|TF_RO, 1, 1, "yiaddr" },
- { doff(siaddr), TT_IP|TF_STATIC, 1, 1, "siaddr" },
- { doff(giaddr), TT_IP|TF_STATIC|TF_RO, 1, 1, "giaddr" },
- { doff(chaddr), TT_OCTET|TF_STATIC|TF_RO, 1, 16, "chaddr" },
- { doff(sname), TT_ASCII|TF_STATIC, 1, 64, "sname" },
- { doff(file), TT_ASCII|TF_STATIC, 1, 128, "file" },
- };
- #define N_STATIC arraysize(statictag)
- static tagdef_t alltagdef[N_STATIC + 254]; /* List of tag definitions. */
- #define tagdef (alltagdef+N_STATIC-1) /* Just the optional ones. */
- #define tagdefined(tp) ((tp)->name != nil)
- static void inittagdef(void)
- {
- /* Initialize the tag definitions from the "tag" commands in the config
- * file.
- */
- int t;
- tagdef_t *tp;
- static tagdef_t predef[] = {
- { DHCP_TAG_NETMASK, TT_IP, 1, 1, "netmask" },
- { DHCP_TAG_GATEWAY, TT_IP, 1, 255, "gateway" },
- { DHCP_TAG_DNS, TT_IP, 1, 255, "DNSserver" },
- };
- static char *typenames[] = { "ascii", "boolean", "ip", "number", "octet" };
- config_t *cfg;
- static u8_t rotags[] = {
- DHCP_TAG_REQIP, DHCP_TAG_OVERLOAD, DHCP_TAG_TYPE, DHCP_TAG_SERVERID,
- DHCP_TAG_REQPAR, DHCP_TAG_MESSAGE, DHCP_TAG_MAXDHCP
- };
- for (t= 1; t <= 254; t++) {
- tp= &tagdef[t];
- tp->tag= t;
- tp->type= TT_OCTET;
- tp->name= nil;
- }
- /* Set the static and "all Minix needs" tags. */
- memcpy(alltagdef, statictag, sizeof(statictag));
- for (tp= predef; tp < arraylimit(predef); tp++) tagdef[tp->tag] = *tp;
- /* Search for tag definitions in the config file. */
- for (cfg= dhcpconf; cfg != nil; cfg= cfg->next) {
- config_t *cmd= cfg->list;
- if (strcasecmp(cmd->word, "tag") == 0) {
- if (config_length(cmd) == 6
- && (cmd->next->flags & CFG_DULONG)
- && config_isatom(cmd->next->next)
- && config_isatom(cmd->next->next->next)
- && (cmd->next->next->next->next->flags & CFG_DULONG)
- && (cmd->next->next->next->next->next->flags & CFG_DULONG)
- ) {
- unsigned long tag, gran, max;
- const char *name, *typename;
- unsigned type;
- tag= strtoul(cmd->next->word, nil, 10);
- name= cmd->next->next->word;
- typename= cmd->next->next->next->word;
- gran= strtoul(cmd->next->next->next->next->word, nil, 10);
- max= strtoul(cmd->next->next->next->next->next->word, nil, 10);
- for (type= 0; type < arraysize(typenames); type++) {
- if (strcasecmp(typename, typenames[type]) == 0) break;
- }
- if (!(1 <= tag && tag <= 254)
- || !(type < arraysize(typenames))
- || !((type == TT_NUMBER
- && (gran == 1 || gran == 2 || gran == 4))
- || (type != TT_NUMBER && 1 <= gran && gran <= 16))
- || !(max <= 255)
- ) {
- fprintf(stderr,
- "\"%s\", line %u: Tag definition is incorrect\n",
- cmd->file, cmd->line);
- exit(1);
- }
- tp= &tagdef[(int)tag];
- tp->type= type;
- tp->name= name;
- tp->gran= gran;
- tp->max= max;
- } else {
- fprintf(stderr,
- "\"%s\", line %u: Usage: tag number name type granularity max\n",
- cmd->file, cmd->line);
- exit(1);
- }
- }
- }
- /* Many DHCP tags are not for the user to play with. */
- for (t= 0; t < arraysize(rotags); t++) tagdef[rotags[t]].type |= TF_RO;
- }
- static tagdef_t *tagdefbyname(const char *name)
- {
- /* Find a tag definition by the name of the tag. Return null if not
- * defined.
- */
- tagdef_t *tp;
- for (tp= alltagdef; tp < arraylimit(alltagdef); tp++) {
- if (tagdefined(tp) && strcasecmp(tp->name, name) == 0) return tp;
- }
- return nil;
- }
- void initdhcpconf(void)
- {
- /* Read/refresh configuration from the DHCP configuration file. */
- dhcpconf= config_read(configfile, 0, dhcpconf);
- if (config_renewed(dhcpconf)) inittagdef();
- }
- static void configtag(dhcp_t *dp, config_t *cmd, ipaddr_t ifip)
- {
- /* Add a tag to a DHCP packet from the config file. */
- tagdef_t *tp;
- u8_t data[260], *d;
- size_t i;
- int delete= 0;
- if (strcasecmp(cmd->word, "no") == 0) {
- if (config_length(cmd) != 2 || !config_isatom(cmd->next)) {
- fprintf(stderr, "\"%s\", line %u: Usage: no tag-name\n",
- cmd->file, cmd->line);
- exit(1);
- }
- cmd= cmd->next;
- delete= 1;
- }
- if ((tp= tagdefbyname(cmd->word)) == nil) {
- fprintf(stderr, "\"%s\", line %u: Unknown tag '%s'\n",
- cmd->file, cmd->line, cmd->word);
- exit(1);
- }
- if (tp->type & TF_RO) {
- fprintf(stderr, "\"%s\", line %u: Tag '%s' can't be configured\n",
- cmd->file, cmd->line, cmd->word);
- exit(1);
- }
- i= 0;
- d= data;
- if (!delete) {
- config_t *arg= cmd->next;
- do {
- switch (tp->type & TF_TYPE) {
- case TT_ASCII: {
- if (arg == nil || !config_isatom(arg) || arg->next != nil) {
- fprintf(stderr, "\"%s\", line %u: Usage: %s string\n",
- cmd->file, cmd->line, cmd->word);
- exit(1);
- }
- strncpy((char *) data, arg->word, sizeof(data));
- d += i = strnlen((char *) data, sizeof(data));
- break;}
- case TT_BOOLEAN: {
- if (arg == nil || !config_isatom(arg)
- || !(strcasecmp(arg->word, "false") == 0
- || strcasecmp(arg->word, "true") == 0)
- ) {
- fprintf(stderr,
- "\"%s\", line %u: Usage: %s false|true ...\n",
- cmd->file, cmd->line, cmd->word);
- exit(1);
- }
- if (d < arraylimit(data)) {
- *d++ = (arg->word[0] != 'f' && arg->word[0] != 'F');
- }
- i++;
- break;}
- case TT_IP: {
- ipaddr_t ip;
- unsigned long len;
- char *end;
- if (arg == nil || !config_isatom(arg)) {
- fprintf(stderr, "\"%s\", line %u: Usage: %s host ...\n",
- cmd->file, cmd->line, cmd->word);
- exit(1);
- }
- if (arg->word[0] == '/'
- && between(1, len= strtoul(arg->word+1, &end, 10), 31)
- && *end == 0
- ) {
- ip= htonl((0xFFFFFFFFUL << (32-len)) & 0xFFFFFFFFUL);
- } else
- if (!name2ip(&ip, arg->word, ifip)) {
- fprintf(stderr,
- "\"%s\", line %u: Can't translate %s to an IP address\n",
- arg->file, arg->line, arg->word);
- exit(1);
- }
- if (d <= arraylimit(data) - sizeof(ip)) {
- memcpy(d, &ip, sizeof(ip));
- d += sizeof(ip);
- }
- i++;
- break;}
- case TT_NUMBER: {
- unsigned long n;
- int g;
- if (arg == nil || !(arg->flags & CFG_CLONG)) {
- fprintf(stderr, "\"%s\", line %u: Usage: %s number ...\n",
- cmd->file, cmd->line, cmd->word);
- exit(1);
- }
- n= strtoul(arg->word, nil, 0);
- g= tp->gran;
- do {
- if (d <= arraylimit(data)) *d++ = (n >> (--g * 8)) & 0xFF;
- } while (g != 0);
- i++;
- break;}
- case TT_OCTET: {
- if (arg == nil || !config_isatom(arg) || arg->next != nil) {
- fprintf(stderr, "\"%s\", line %u: Usage: %s hexdigits\n",
- cmd->file, cmd->line, cmd->word);
- exit(1);
- }
- i= ascii2octet(data, sizeof(data), arg->word);
- if (i == -1) {
- fprintf(stderr,
- "\"%s\", line %u: %s: Bad hexdigit string\n",
- arg->file, arg->line, arg->word);
- exit(1);
- }
- d= data + i;
- break;}
- }
- } while ((arg= arg->next) != nil);
- if (d > data + 255) {
- fprintf(stderr, "\"%s\", line %u: Tag value is way too big\n",
- cmd->file, cmd->line);
- exit(1);
- }
- if ((tp->type & TF_TYPE) != TT_NUMBER && (i % tp->gran) != 0) {
- fprintf(stderr,
- "\"%s\", line %u: Expected a multiple of %d initializers\n",
- cmd->file, cmd->line, tp->gran);
- exit(1);
- }
- if (tp->max != 0 && i > tp->max) {
- fprintf(stderr,
- "\"%s\", line %u: Got %d initializers, can have only %d\n",
- cmd->file, cmd->line, (int) i, tp->max);
- exit(1);
- }
- }
- if (tp->type & TF_STATIC) {
- size_t len= tp->gran * tp->max;
- if ((tp->type & TF_TYPE) == TT_IP) len *= sizeof(ipaddr_t);
- memset(B(dp) + tp->tag, 0, len);
- memcpy(B(dp) + tp->tag, data, (d - data));
- } else {
- settag(dp, tp->tag, data, (d - data));
- }
- }
- int makedhcp(dhcp_t *dp, u8_t *class, size_t calen, u8_t *client, size_t cilen,
- ipaddr_t ip, ipaddr_t ifip, network_t *np)
- {
- /* Fill in a DHCP packet at 'dp' for the host identified by the
- * (class, client, ip) combination. Makedhcp is normally called twice,
- * once to find the IP address (so ip == 0) and once again to find all
- * data that goes with that IP address (ip != 0). On the first call the
- * return value of this function should be ignored and only 'yiaddr'
- * checked and used as 'ip' on the next pass. True is returned iff there
- * is information for the client on the network at interface address
- * 'ifip', by checking if the 'ip' and 'ifip' are on the same network.
- * If np is nonnull then we are working for one of our own interfaces, so
- * options can be set and adjourning interfaces can be programmed.
- */
- config_t *todo[16];
- size_t ntodo= 0;
- ipaddr_t hip, mask;
- u8_t *pmask;
- char *hostname;
- u32_t distance= -1;
- initdhcpconf();
- /* Start creating a packet. */
- dhcp_init(dp);
- dp->op= DHCP_BOOTREPLY;
- /* The initial TODO list is the whole DHCP config. */
- todo[ntodo++]= dhcpconf;
- while (ntodo > 0) {
- config_t *cmd, *follow;
- if (todo[ntodo-1] == nil) { ntodo--; continue; }
- cmd= todo[ntodo-1]->list;
- todo[ntodo-1]= todo[ntodo-1]->next;
- follow= nil; /* Macro or list to follow next? */
- if (strcasecmp(cmd->word, "client") == 0) {
- u8_t cfgid[CLID_MAX];
- size_t cfglen;
- char *name;
- int ifno;
- u32_t d;
- if (between(3, config_length(cmd), 5)
- && config_isatom(cmd->next)
- && (cfglen= ascii2clid(cfgid, cmd->next->word)) != -1
- && config_isatom(cmd->next->next)
- && (((ifno= ifname2if(cmd->next->next->word)) == -1
- && config_length(cmd) <= 4)
- || ((ifno= ifname2if(cmd->next->next->word)) != -1
- && config_length(cmd) >= 4
- && config_isatom(cmd->next->next->next)))
- ) {
- if (cilen == cfglen && memcmp(client, cfgid, cilen) == 0
- && (ifno == -1 || np == nil || ifno == np->n)
- ) {
- config_t *atname= cmd->next->next;
- if (ifno != -1) atname= atname->next;
- name= atname->word;
- if (name2ip(&hip, name, ifip) && (ip == 0 || ip == hip)) {
- d= ntohl(hip) ^ ntohl(ifip);
- if (d < distance) {
- dp->yiaddr= hip;
- follow= atname->next;
- distance= d;
- }
- }
- }
- } else {
- fprintf(stderr,
- "\"%s\", line %u: Usage: client ID [ip#] host [macro|{params}]\n",
- cmd->file, cmd->line);
- exit(1);
- }
- } else
- if (strcasecmp(cmd->word, "class") == 0) {
- config_t *clist;
- int match;
- match= 0;
- for (clist= cmd->next; clist != nil
- && clist->next != nil
- && config_isatom(clist); clist= clist->next) {
- if (calen > 0
- && strncmp(clist->word, (char *) class, calen) == 0
- ) {
- match= 1;
- }
- }
- if (clist == cmd->next || clist->next != nil) {
- fprintf(stderr,
- "\"%s\", line %u: Usage: class class-name ... macro|{params}\n",
- cmd->file, cmd->line);
- }
- if (match) follow= clist;
- } else
- if (strcasecmp(cmd->word, "host") == 0) {
- if (config_length(cmd) == 3
- && config_isatom(cmd->next)
- ) {
- if (ip != 0) {
- if (cidr_aton(cmd->next->word, &hip, &mask)) {
- if (((hip ^ ip) & mask) == 0) {
- if (!gettag(dp, DHCP_TAG_NETMASK, nil, nil)) {
- settag(dp, DHCP_TAG_NETMASK,
- &mask, sizeof(mask));
- }
- dp->yiaddr= ip;
- follow= cmd->next->next;
- }
- } else
- if (name2ip(&hip, cmd->next->word, ifip)) {
- if (hip == ip) {
- dp->yiaddr= ip;
- follow= cmd->next->next;
- }
- }
- }
- } else {
- fprintf(stderr,
- "\"%s\", line %u: Usage: host host-spec macro|{params}\n",
- cmd->file, cmd->line);
- exit(1);
- }
- } else
- if (strcasecmp(cmd->word, "interface") == 0) {
- if (between(3, config_length(cmd), 4)
- && config_isatom(cmd->next)
- && config_isatom(cmd->next->next)
- ) {
- network_t *ifnp;
- if (np != nil) {
- if ((ifnp= if2net(ifname2if(cmd->next->word))) == nil) {
- fprintf(stderr,
- "\"%s\", line %u: Can't find interface %s\n",
- cmd->next->file, cmd->next->line, cmd->next->word);
- exit(1);
- }
- if (!name2ip(&hip, cmd->next->next->word, 0)) {
- fprintf(stderr,
- "\"%s\", line %u: Can't find IP address of %s\n",
- cmd->next->next->file, cmd->next->next->line,
- cmd->next->next->word);
- exit(1);
- }
- ifnp->ip= hip;
- if (ifnp == np) {
- dp->yiaddr= hip;
- follow= cmd->next->next->next;
- }
- }
- } else {
- fprintf(stderr,
- "\"%s\", line %u: Usage: interface ip# host%s\n",
- cmd->file, cmd->line, ntodo==1 ? " [macro|{params}]" : "");
- exit(1);
- }
- } else
- if (strcasecmp(cmd->word, "macro") == 0) {
- if (config_length(cmd) == 2 && config_isatom(cmd->next)) {
- follow= cmd->next;
- } else
- if (ntodo > 1) {
- fprintf(stderr, "\"%s\", line %u: Usage: macro macro-name\n",
- cmd->file, cmd->line);
- exit(1);
- }
- } else
- if (strcasecmp(cmd->word, "tag") == 0) {
- if (ntodo > 1) {
- fprintf(stderr,
- "\"%s\", line %u: A %s can't be defined here\n",
- cmd->file, cmd->line, cmd->word);
- exit(1);
- }
- } else
- if (strcasecmp(cmd->word, "option") == 0) {
- int ifno;
- network_t *ifnp;
- config_t *opt;
- if ((opt= cmd->next) != nil
- && config_isatom(opt)
- && (ifno= ifname2if(opt->word)) != -1
- ) {
- if ((ifnp= if2net(ifno)) == nil) {
- fprintf(stderr,
- "\"%s\", line %u: Interface %s is not enabled\n",
- opt->file, opt->line, opt->word);
- exit(1);
- }
- opt= opt->next;
- } else {
- ifnp= np;
- }
- if (between(1, config_length(opt), 2)
- && config_isatom(opt)
- && strcasecmp(opt->word, "server") == 0
- && (opt->next == nil
- || strcasecmp(opt->next->word, "inform") == 0)
- ) {
- if (np != nil) {
- ifnp->flags |= NF_SERVING;
- if (opt->next != nil) ifnp->flags |= NF_INFORM;
- }
- } else
- if (config_length(opt) == 2
- && config_isatom(opt)
- && strcasecmp(opt->word, "relay") == 0
- && config_isatom(opt->next)
- ) {
- if (np != nil) {
- if (!name2ip(&hip, opt->next->word, ifip)) {
- fprintf(stderr,
- "\"%s\", line %u: Can't find IP address of %s\n",
- opt->next->file, opt->next->line,
- opt->next->word);
- exit(1);
- }
- ifnp->flags |= NF_RELAYING;
- ifnp->server= hip;
- }
- } else
- if (config_length(opt) == 1
- && config_isatom(opt)
- && strcasecmp(opt->word, "possessive") == 0
- ) {
- if (np != nil) ifnp->flags |= NF_POSSESSIVE;
- } else
- if (config_length(opt) == 2
- && config_isatom(opt)
- && strcasecmp(opt->word, "hostname") == 0
- && config_isatom(opt->next)
- ) {
- if (np != nil) np->hostname= opt->next->word;
- } else {
- fprintf(stderr, "\"%s\", line %u: Unknown option\n",
- cmd->file, cmd->line);
- exit(1);
- }
- } else {
- /* Must be an actual data carrying tag. */
- configtag(dp, cmd, ifip);
- }
- if (follow != nil) {
- /* A client/class/host entry selects a macro or list that must
- * be followed next.
- */
- config_t *macro;
- if (config_isatom(follow)) { /* Macro name */
- config_t *cfg;
- for (cfg= dhcpconf; cfg != nil; cfg= cfg->next) {
- macro= cfg->list;
- if (strcasecmp(macro->word, "macro") == 0) {
- if (config_length(macro) == 3
- && config_isatom(macro->next)
- && config_issub(macro->next->next)
- ) {
- if (strcasecmp(macro->next->word, follow->word) == 0
- ) {
- break;
- }
- } else {
- fprintf(stderr,
- "\"%s\", line %u: Usage: macro macro-name {params}\n",
- macro->file, macro->line);
- }
- }
- }
- follow= cfg == nil ? nil : macro->next->next->list;
- } else {
- /* Simply a list of more tags and stuff. */
- follow= follow->list;
- }
- if (ntodo == arraysize(todo)) {
- fprintf(stderr, "\"%s\", line %u: Nesting is too deep\n",
- follow->file, follow->line);
- exit(1);
- }
- todo[ntodo++]= follow;
- }
- }
- /* Check if the IP and netmask are OK for the interface. */
- if (!gettag(dp, DHCP_TAG_NETMASK, &pmask, nil)) return 0;
- memcpy(&mask, pmask, sizeof(mask));
- if (((ip ^ ifip) & mask) != 0) return 0;
- /* Fill in the hostname and/or domain. */
- if ((hostname= ip2name(ip)) != nil) {
- char *domain;
- if ((domain= strchr(hostname, '.')) != nil) *domain++ = 0;
- if (!gettag(dp, DHCP_TAG_HOSTNAME, nil, nil)) {
- settag(dp, DHCP_TAG_HOSTNAME, hostname, strlen(hostname));
- }
- if (domain != nil && !gettag(dp, DHCP_TAG_DOMAIN, nil, nil)) {
- settag(dp, DHCP_TAG_DOMAIN, domain, strlen(domain));
- }
- }
- return 1;
- }
- static char *dhcpopname(int op)
- {
- static char *onames[] = { "??\?", "REQUEST", "REPLY" };
- return onames[op < arraysize(onames) ? op : 0];
- }
- char *dhcptypename(int type)
- {
- static char *tnames[] = {
- "??\?", "DISCOVER", "OFFER", "REQUEST", "DECLINE",
- "ACK", "NAK", "RELEASE", "INFORM"
- };
- return tnames[type < arraysize(tnames) ? type : 0];
- }
- void printdhcp(dhcp_t *dp)
- {
- /* Print the contents of a DHCP packet, usually for debug purposes. */
- tagdef_t *tp;
- u8_t *data, *ovld;
- size_t i, len;
- for (tp= alltagdef; tp < arraylimit(alltagdef); tp++) {
- if (tp->type & TF_STATIC) {
- data= B(dp) + tp->tag;
- len= tp->gran * tp->max;
- if ((tp->type & TF_TYPE) == TT_IP) len *= sizeof(ipaddr_t);
- if (tp->tag == doff(chaddr)) len= dp->hlen;
- /* Don't show uninteresting stuff. */
- if (tp->tag == doff(htype) && dp->htype == DHCP_HTYPE_ETH) continue;
- if (tp->tag == doff(hlen) && dp->hlen == DHCP_HLEN_ETH) continue;
- if ((tp->tag == doff(file) || tp->tag == doff(sname))
- && gettag(dp, DHCP_TAG_OVERLOAD, &ovld, nil)
- && (ovld[0] & (tp->tag == doff(file) ? 1 : 2))
- ) {
- continue;
- }
- for (i= 0; i < len && data[i] == 0; i++) {}
- if (i == len) continue;
- } else {
- if (!gettag(dp, tp->tag, &data, &len)) continue;
- }
- if (tagdefined(tp)) {
- printf("\t%s =", tp->name);
- } else {
- printf("\tT%d =", tp->tag);
- }
- i= 0;
- while (i < len) {
- switch (tp->type & TF_TYPE) {
- case TT_ASCII: {
- printf(" \"%.*s\"", (int) len, data);
- i= len;
- break;}
- case TT_BOOLEAN: {
- printf(data[i++] == 0 ? " false" : " true");
- break;}
- case TT_IP: {
- ipaddr_t ip;
- memcpy(&ip, data+i, sizeof(ip));
- printf(" %s", inet_ntoa(ip));
- i += sizeof(ip);
- break;}
- case TT_NUMBER: {
- u32_t n= 0;
- int g= tp->gran;
- do n= (n << 8) | data[i++]; while (--g != 0);
- printf(" %lu", (unsigned long) n);
- if ((tp->type & TF_STATIC) && tp->tag == doff(op)) {
- printf(" (%s)", dhcpopname(n));
- }
- if (!(tp->type & TF_STATIC) && tp->tag == DHCP_TAG_TYPE) {
- printf(" (%s)", dhcptypename(n));
- }
- break;}
- case TT_OCTET: {
- if (i == 0) fputc(' ', stdout);
- printf("%02X", data[i++]);
- break;}
- }
- }
- fputc('\n', stdout);
- }
- }