URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [res_mkupdate.c] - Blame information for rev 30

Go to most recent revision | Details | Compare with Previous | View Log


/*
 * Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */
 
/*
 * Based on the Dynamic DNS reference implementation by Viraj Bais
 * <viraj_bais@ccm.fm.intel.com>
 */
 
#if !defined(__rtems__)
#if !defined(lint) && !defined(SABER)
static char rcsid[] = "$Id: res_mkupdate.c,v 1.2 2001-09-27 12:01:53 chris Exp $";
#endif /* not lint */
#endif /* not rtems */
 
#include <sys/types.h>
#include <sys/param.h>
 
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
 
#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
 
#include "res_config.h"
 
static int getnum_str(u_char **, u_char *);
static int getword_str(char *, int, u_char **, u_char *);
 
#define ShrinkBuffer(x)  if ((buflen -= x) < 0) return (-2);
 
/*
 * Form update packets.
 * Returns the size of the resulting packet if no error
 * On error,
 *      returns -1 if error in reading a word/number in rdata
 *                 portion for update packets
 *              -2 if length of buffer passed is insufficient
 *              -3 if zone section is not the first section in
 *                 the linked list, or section order has a problem
 *              -4 on a number overflow
 *              -5 unknown operation or no records
 */
int
res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
        ns_updrec *rrecp_start = rrecp_in;
        HEADER *hp;
        u_char *cp, *sp1, *sp2, *startp, *endp;
        int n, i, soanum, multiline;
        ns_updrec *rrecp;
        struct in_addr ina;
        char buf2[MAXDNAME];
        int section, numrrs = 0, counts[ns_s_max];
        u_int16_t rtype, rclass;
        u_int32_t n1, rttl;
        u_char *dnptrs[20], **dpp, **lastdnptr;
 
        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
                h_errno = NETDB_INTERNAL;
                return (-1);
        }
 
        /*
         * Initialize header fields.
         */
        if ((buf == NULL) || (buflen < HFIXEDSZ))
                return (-1);
        memset(buf, 0, HFIXEDSZ);
        hp = (HEADER *) buf;
        hp->id = htons(++_res.id);
        hp->opcode = ns_o_update;
        hp->rcode = NOERROR;
        sp1 = buf + 2*INT16SZ;  /* save pointer to zocount */
        cp = buf + HFIXEDSZ;
        buflen -= HFIXEDSZ;
        dpp = dnptrs;
        *dpp++ = buf;
        *dpp++ = NULL;
        lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 
        if (rrecp_start == NULL)
                return (-5);
        else if (rrecp_start->r_section != S_ZONE)
                return (-3);
 
        memset(counts, 0, sizeof counts);
        for (rrecp = rrecp_start; rrecp; rrecp = rrecp->r_grpnext) {
                numrrs++;
                section = rrecp->r_section;
                if (section < 0 || section >= ns_s_max)
                        return (-1);
                counts[section]++;
                for (i = section + 1; i < ns_s_max; i++)
                        if (counts[i])
                                return (-3);
                rtype = rrecp->r_type;
                rclass = rrecp->r_class;
                rttl = rrecp->r_ttl;
                /* overload class and type */
                if (section == S_PREREQ) {
                        rttl = 0;
                        switch (rrecp->r_opcode) {
                        case YXDOMAIN:
                                rclass = C_ANY;
                                rtype = T_ANY;
                                rrecp->r_size = 0;
                                break;
                        case NXDOMAIN:
                                rclass = C_NONE;
                                rtype = T_ANY;
                                rrecp->r_size = 0;
                                break;
                        case NXRRSET:
                                rclass = C_NONE;
                                rrecp->r_size = 0;
                                break;
                        case YXRRSET:
                                if (rrecp->r_size == 0)
                                        rclass = C_ANY;
                                break;
                        default:
                                fprintf(stderr,
                                        "res_mkupdate: incorrect opcode: %d\n",
                                        rrecp->r_opcode);
                                fflush(stderr);
                                return (-1);
                        }
                } else if (section == S_UPDATE) {
                        switch (rrecp->r_opcode) {
                        case DELETE:
                                rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
                                break;
                        case ADD:
                                break;
                        default:
                                fprintf(stderr,
                                        "res_mkupdate: incorrect opcode: %d\n",
                                        rrecp->r_opcode);
                                fflush(stderr);
                                return (-1);
                        }
                }
 
                /*
                 * XXX  appending default domain to owner name is omitted,
                 *      fqdn must be provided
                 */
                if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
                                 lastdnptr)) < 0)
                        return (-1);
                cp += n;
                ShrinkBuffer(n + 2*INT16SZ);
                PUTSHORT(rtype, cp);
                PUTSHORT(rclass, cp);
                if (section == S_ZONE) {
                        if (numrrs != 1 || rrecp->r_type != T_SOA)
                                return (-3);
                        continue;
                }
                ShrinkBuffer(INT32SZ + INT16SZ);
                PUTLONG(rttl, cp);
                sp2 = cp;  /* save pointer to length byte */
                cp += INT16SZ;
                if (rrecp->r_size == 0) {
                        if (section == S_UPDATE && rclass != C_ANY)
                                return (-1);
                        else {
                                PUTSHORT(0, sp2);
                                continue;
                        }
                }
                startp = rrecp->r_data;
                endp = startp + rrecp->r_size - 1;
                /* XXX this should be done centrally. */
                switch (rrecp->r_type) {
                case T_A:
                        if (!getword_str(buf2, sizeof buf2, &startp, endp))
                                return (-1);
                        if (!inet_aton(buf2, &ina))
                                return (-1);
                        n1 = ntohl(ina.s_addr);
                        ShrinkBuffer(INT32SZ);
                        PUTLONG(n1, cp);
                        break;
                case T_CNAME:
                case T_MB:
                case T_MG:
                case T_MR:
                case T_NS:
                case T_PTR:
                        if (!getword_str(buf2, sizeof buf2, &startp, endp))
                                return (-1);
                        n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
                        if (n < 0)
                                return (-1);
                        cp += n;
                        ShrinkBuffer(n);
                        break;
                case T_MINFO:
                case T_SOA:
                case T_RP:
                        for (i = 0; i < 2; i++) {
                                if (!getword_str(buf2, sizeof buf2, &startp,
                                                 endp))
                                return (-1);
                                n = dn_comp(buf2, cp, buflen,
                                            dnptrs, lastdnptr);
                                if (n < 0)
                                        return (-1);
                                cp += n;
                                ShrinkBuffer(n);
                        }
                        if (rrecp->r_type == T_SOA) {
                                ShrinkBuffer(5 * INT32SZ);
                                while (isspace(*startp) || !*startp)
                                        startp++;
                                if (*startp == '(') {
                                        multiline = 1;
                                        startp++;
                                } else
                                        multiline = 0;
                                /* serial, refresh, retry, expire, minimum */
                                for (i = 0; i < 5; i++) {
                                        soanum = getnum_str(&startp, endp);
                                        if (soanum < 0)
                                                return (-1);
                                        PUTLONG(soanum, cp);
                                }
                                if (multiline) {
                                        while (isspace(*startp) || !*startp)
                                                startp++;
                                        if (*startp != ')')
                                                return (-1);
                                }
                        }
                        break;
                case T_MX:
                case T_AFSDB:
                case T_RT:
                        n = getnum_str(&startp, endp);
                        if (n < 0)
                                return (-1);
                        PUTSHORT(n, cp);
                        ShrinkBuffer(INT16SZ);
                        if (!getword_str(buf2, sizeof buf2, &startp, endp))
                                return (-1);
                        n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
                        if (n < 0)
                                return (-1);
                        cp += n;
                        ShrinkBuffer(n);
                        break;
                case T_PX:
                        n = getnum_str(&startp, endp);
                        if (n < 0)
                                return (-1);
                        PUTSHORT(n, cp);
                        ShrinkBuffer(INT16SZ);
                        for (i = 0; i < 2; i++) {
                                if (!getword_str(buf2, sizeof buf2, &startp,
                                                 endp))
                                        return (-1);
                                n = dn_comp(buf2, cp, buflen, dnptrs,
                                            lastdnptr);
                                if (n < 0)
                                        return (-1);
                                cp += n;
                                ShrinkBuffer(n);
                        }
                        break;
                case T_WKS:
                case T_HINFO:
                case T_TXT:
                case T_X25:
                case T_ISDN:
                case T_NSAP:
                case T_LOC:
                        /* XXX - more fine tuning needed here */
                        ShrinkBuffer(rrecp->r_size);
                        memcpy(cp, rrecp->r_data, rrecp->r_size);
                        cp += rrecp->r_size;
                        break;
                default:
                        return (-1);
                } /*switch*/
                n = (u_int16_t)((cp - sp2) - INT16SZ);
                PUTSHORT(n, sp2);
        } /*for*/
 
        hp->qdcount = htons(counts[0]);
        hp->ancount = htons(counts[1]);
        hp->nscount = htons(counts[2]);
        hp->arcount = htons(counts[3]);
        return (cp - buf);
}
 
/*
 * Get a whitespace delimited word from a string (not file)
 * into buf. modify the start pointer to point after the
 * word in the string.
 */
static int
getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
        char *cp;
        int c;
 
        for (cp = buf; *startpp <= endp; ) {
                c = **startpp;
                if (isspace(c) || c == '\0') {
                        if (cp != buf) /* trailing whitespace */
                                break;
                        else { /* leading whitespace */
                                (*startpp)++;
                                continue;
                        }
                }
                (*startpp)++;
                if (cp >= buf+size-1)
                        break;
                *cp++ = (u_char)c;
        }
        *cp = '\0';
        return (cp != buf);
}
 
/*
 * Get a whitespace delimited number from a string (not file) into buf
 * update the start pointer to point after the number in the string.
 */
static int
getnum_str(u_char **startpp, u_char *endp) {
        int c, n;
        int seendigit = 0;
        int m = 0;
 
        for (n = 0; *startpp <= endp; ) {
                c = **startpp;
                if (isspace(c) || c == '\0') {
                        if (seendigit) /* trailing whitespace */
                                break;
                        else { /* leading whitespace */
                                (*startpp)++;
                                continue;
                        }
                }
                if (c == ';') {
                        while ((*startpp <= endp) &&
                               ((c = **startpp) != '\n'))
                                        (*startpp)++;
                        if (seendigit)
                                break;
                        continue;
                }
                if (!isdigit(c)) {
                        if (c == ')' && seendigit) {
                                (*startpp)--;
                                break;
                        }
                        return (-1);
                }
                (*startpp)++;
                n = n * 10 + (c - '0');
                seendigit = 1;
        }
        return (n + m);
}
 
/*
 * Allocate a resource record buffer & save rr info.
 */
ns_updrec *
res_mkupdrec(int section, const char *dname,
             u_int class, u_int type, u_long ttl) {
        ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 
        if (!rrecp || !(rrecp->r_dname = strdup(dname)))
                return (NULL);
        rrecp->r_class = class;
        rrecp->r_type = type;
        rrecp->r_ttl = ttl;
        rrecp->r_section = section;
        return (rrecp);
}
 
/*
 * Free a resource record buffer created by res_mkupdrec.
 */
void
res_freeupdrec(ns_updrec *rrecp) {
        /* Note: freeing r_dp is the caller's responsibility. */
        if (rrecp->r_dname != NULL)
                free(rrecp->r_dname);
        free(rrecp);
}

Browse

Tools

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [res_mkupdate.c] - Blame information for rev 30

Line No.	Rev	Author	Line
1	30	unneback	`/*`
2			`* Copyright (c) 1996 by Internet Software Consortium.`
3			`*`
4			`* Permission to use, copy, modify, and distribute this software for any`
5			`* purpose with or without fee is hereby granted, provided that the above`
6			`* copyright notice and this permission notice appear in all copies.`
7			`*`
8			`* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS`
9			`* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES`
10			`* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE`
11			`* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL`
12			`* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR`
13			`* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS`
14			`* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS`
15			`* SOFTWARE.`
16			`*/`
17
18			`/*`
19			`* Based on the Dynamic DNS reference implementation by Viraj Bais`
20			`* <viraj_bais@ccm.fm.intel.com>`
21			`*/`
22
23			`#if !defined(__rtems__)`
24			`#if !defined(lint) && !defined(SABER)`
25			`static char rcsid[] = "$Id: res_mkupdate.c,v 1.2 2001-09-27 12:01:53 chris Exp $";`
26			`#endif /* not lint */`
27			`#endif /* not rtems */`
28
29			`#include <sys/types.h>`
30			`#include <sys/param.h>`
31
32			`#include <netinet/in.h>`
33			`#include <arpa/nameser.h>`
34			`#include <arpa/inet.h>`
35
36			`#include <errno.h>`
37			`#include <limits.h>`
38			`#include <netdb.h>`
39			`#include <resolv.h>`
40			`#include <stdio.h>`
41			`#include <stdlib.h>`
42			`#include <string.h>`
43			`#include <unistd.h>`
44			`#include <ctype.h>`
45
46			`#include "res_config.h"`
47
48			`static int getnum_str(u_char *, u_char );`
49			`static int getword_str(char , int, u_char , u_char );`
50
51			`#define ShrinkBuffer(x) if ((buflen -= x) < 0) return (-2);`
52
53			`/*`
54			`* Form update packets.`
55			`* Returns the size of the resulting packet if no error`
56			`* On error,`
57			`* returns -1 if error in reading a word/number in rdata`
58			`* portion for update packets`
59			`* -2 if length of buffer passed is insufficient`
60			`* -3 if zone section is not the first section in`
61			`* the linked list, or section order has a problem`
62			`* -4 on a number overflow`
63			`* -5 unknown operation or no records`
64			`*/`
65			`int`
66			`res_mkupdate(ns_updrec rrecp_in, u_char buf, int buflen) {`
67			`ns_updrec *rrecp_start = rrecp_in;`
68			`HEADER *hp;`
69			`u_char cp, sp1, sp2, startp, *endp;`
70			`int n, i, soanum, multiline;`
71			`ns_updrec *rrecp;`
72			`struct in_addr ina;`
73			`char buf2[MAXDNAME];`
74			`int section, numrrs = 0, counts[ns_s_max];`
75			`u_int16_t rtype, rclass;`
76			`u_int32_t n1, rttl;`
77			`u_char dnptrs[20], dpp, *lastdnptr;`
78
79			`if ((_res.options & RES_INIT) == 0 && res_init() == -1) {`
80			`h_errno = NETDB_INTERNAL;`
81			`return (-1);`
82			`}`
83
84			`/*`
85			`* Initialize header fields.`
86			`*/`
87			`if ((buf == NULL) \|\| (buflen < HFIXEDSZ))`
88			`return (-1);`
89			`memset(buf, 0, HFIXEDSZ);`
90			`hp = (HEADER *) buf;`
91			`hp->id = htons(++_res.id);`
92			`hp->opcode = ns_o_update;`
93			`hp->rcode = NOERROR;`
94			`sp1 = buf + 2INT16SZ; / save pointer to zocount */`
95			`cp = buf + HFIXEDSZ;`
96			`buflen -= HFIXEDSZ;`
97			`dpp = dnptrs;`
98			`*dpp++ = buf;`
99			`*dpp++ = NULL;`
100			`lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];`
101
102			`if (rrecp_start == NULL)`
103			`return (-5);`
104			`else if (rrecp_start->r_section != S_ZONE)`
105			`return (-3);`
106
107			`memset(counts, 0, sizeof counts);`
108			`for (rrecp = rrecp_start; rrecp; rrecp = rrecp->r_grpnext) {`
109			`numrrs++;`
110			`section = rrecp->r_section;`
111			`if (section < 0 \|\| section >= ns_s_max)`
112			`return (-1);`
113			`counts[section]++;`
114			`for (i = section + 1; i < ns_s_max; i++)`
115			`if (counts[i])`
116			`return (-3);`
117			`rtype = rrecp->r_type;`
118			`rclass = rrecp->r_class;`
119			`rttl = rrecp->r_ttl;`
120			`/* overload class and type */`
121			`if (section == S_PREREQ) {`
122			`rttl = 0;`
123			`switch (rrecp->r_opcode) {`
124			`case YXDOMAIN:`
125			`rclass = C_ANY;`
126			`rtype = T_ANY;`
127			`rrecp->r_size = 0;`
128			`break;`
129			`case NXDOMAIN:`
130			`rclass = C_NONE;`
131			`rtype = T_ANY;`
132			`rrecp->r_size = 0;`
133			`break;`
134			`case NXRRSET:`
135			`rclass = C_NONE;`
136			`rrecp->r_size = 0;`
137			`break;`
138			`case YXRRSET:`
139			`if (rrecp->r_size == 0)`
140			`rclass = C_ANY;`
141			`break;`
142			`default:`
143			`fprintf(stderr,`
144			`"res_mkupdate: incorrect opcode: %d\n",`
145			`rrecp->r_opcode);`
146			`fflush(stderr);`
147			`return (-1);`
148			`}`
149			`} else if (section == S_UPDATE) {`
150			`switch (rrecp->r_opcode) {`
151			`case DELETE:`
152			`rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;`
153			`break;`
154			`case ADD:`
155			`break;`
156			`default:`
157			`fprintf(stderr,`
158			`"res_mkupdate: incorrect opcode: %d\n",`
159			`rrecp->r_opcode);`
160			`fflush(stderr);`
161			`return (-1);`
162			`}`
163			`}`
164
165			`/*`
166			`* XXX appending default domain to owner name is omitted,`
167			`* fqdn must be provided`
168			`*/`
169			`if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,`
170			`lastdnptr)) < 0)`
171			`return (-1);`
172			`cp += n;`
173			`ShrinkBuffer(n + 2*INT16SZ);`
174			`PUTSHORT(rtype, cp);`
175			`PUTSHORT(rclass, cp);`
176			`if (section == S_ZONE) {`
177			`if (numrrs != 1 \|\| rrecp->r_type != T_SOA)`
178			`return (-3);`
179			`continue;`
180			`}`
181			`ShrinkBuffer(INT32SZ + INT16SZ);`
182			`PUTLONG(rttl, cp);`
183			`sp2 = cp; /* save pointer to length byte */`
184			`cp += INT16SZ;`
185			`if (rrecp->r_size == 0) {`
186			`if (section == S_UPDATE && rclass != C_ANY)`
187			`return (-1);`
188			`else {`
189			`PUTSHORT(0, sp2);`
190			`continue;`
191			`}`
192			`}`
193			`startp = rrecp->r_data;`
194			`endp = startp + rrecp->r_size - 1;`
195			`/* XXX this should be done centrally. */`
196			`switch (rrecp->r_type) {`
197			`case T_A:`
198			`if (!getword_str(buf2, sizeof buf2, &startp, endp))`
199			`return (-1);`
200			`if (!inet_aton(buf2, &ina))`
201			`return (-1);`
202			`n1 = ntohl(ina.s_addr);`
203			`ShrinkBuffer(INT32SZ);`
204			`PUTLONG(n1, cp);`
205			`break;`
206			`case T_CNAME:`
207			`case T_MB:`
208			`case T_MG:`
209			`case T_MR:`
210			`case T_NS:`
211			`case T_PTR:`
212			`if (!getword_str(buf2, sizeof buf2, &startp, endp))`
213			`return (-1);`
214			`n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);`
215			`if (n < 0)`
216			`return (-1);`
217			`cp += n;`
218			`ShrinkBuffer(n);`
219			`break;`
220			`case T_MINFO:`
221			`case T_SOA:`
222			`case T_RP:`
223			`for (i = 0; i < 2; i++) {`
224			`if (!getword_str(buf2, sizeof buf2, &startp,`
225			`endp))`
226			`return (-1);`
227			`n = dn_comp(buf2, cp, buflen,`
228			`dnptrs, lastdnptr);`
229			`if (n < 0)`
230			`return (-1);`
231			`cp += n;`
232			`ShrinkBuffer(n);`
233			`}`
234			`if (rrecp->r_type == T_SOA) {`
235			`ShrinkBuffer(5 * INT32SZ);`
236			`while (isspace(startp) \|\| !startp)`
237			`startp++;`
238			`if (*startp == '(') {`
239			`multiline = 1;`
240			`startp++;`
241			`} else`
242			`multiline = 0;`
243			`/* serial, refresh, retry, expire, minimum */`
244			`for (i = 0; i < 5; i++) {`
245			`soanum = getnum_str(&startp, endp);`
246			`if (soanum < 0)`
247			`return (-1);`
248			`PUTLONG(soanum, cp);`
249			`}`
250			`if (multiline) {`
251			`while (isspace(startp) \|\| !startp)`
252			`startp++;`
253			`if (*startp != ')')`
254			`return (-1);`
255			`}`
256			`}`
257			`break;`
258			`case T_MX:`
259			`case T_AFSDB:`
260			`case T_RT:`
261			`n = getnum_str(&startp, endp);`
262			`if (n < 0)`
263			`return (-1);`
264			`PUTSHORT(n, cp);`
265			`ShrinkBuffer(INT16SZ);`
266			`if (!getword_str(buf2, sizeof buf2, &startp, endp))`
267			`return (-1);`
268			`n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);`
269			`if (n < 0)`
270			`return (-1);`
271			`cp += n;`
272			`ShrinkBuffer(n);`
273			`break;`
274			`case T_PX:`
275			`n = getnum_str(&startp, endp);`
276			`if (n < 0)`
277			`return (-1);`
278			`PUTSHORT(n, cp);`
279			`ShrinkBuffer(INT16SZ);`
280			`for (i = 0; i < 2; i++) {`
281			`if (!getword_str(buf2, sizeof buf2, &startp,`
282			`endp))`
283			`return (-1);`
284			`n = dn_comp(buf2, cp, buflen, dnptrs,`
285			`lastdnptr);`
286			`if (n < 0)`
287			`return (-1);`
288			`cp += n;`
289			`ShrinkBuffer(n);`
290			`}`
291			`break;`
292			`case T_WKS:`
293			`case T_HINFO:`
294			`case T_TXT:`
295			`case T_X25:`
296			`case T_ISDN:`
297			`case T_NSAP:`
298			`case T_LOC:`
299			`/* XXX - more fine tuning needed here */`
300			`ShrinkBuffer(rrecp->r_size);`
301			`memcpy(cp, rrecp->r_data, rrecp->r_size);`
302			`cp += rrecp->r_size;`
303			`break;`
304			`default:`
305			`return (-1);`
306			`} /switch/`
307			`n = (u_int16_t)((cp - sp2) - INT16SZ);`
308			`PUTSHORT(n, sp2);`
309			`} /for/`
310
311			`hp->qdcount = htons(counts[0]);`
312			`hp->ancount = htons(counts[1]);`
313			`hp->nscount = htons(counts[2]);`
314			`hp->arcount = htons(counts[3]);`
315			`return (cp - buf);`
316			`}`
317
318			`/*`
319			`* Get a whitespace delimited word from a string (not file)`
320			`* into buf. modify the start pointer to point after the`
321			`* word in the string.`
322			`*/`
323			`static int`
324			`getword_str(char buf, int size, u_char startpp, u_char endp) {`
325			`char *cp;`
326			`int c;`
327
328			`for (cp = buf; *startpp <= endp; ) {`
329			`c = **startpp;`
330			`if (isspace(c) \|\| c == '\0') {`
331			`if (cp != buf) /* trailing whitespace */`
332			`break;`
333			`else { /* leading whitespace */`
334			`(*startpp)++;`
335			`continue;`
336			`}`
337			`}`
338			`(*startpp)++;`
339			`if (cp >= buf+size-1)`
340			`break;`
341			`*cp++ = (u_char)c;`
342			`}`
343			`*cp = '\0';`
344			`return (cp != buf);`
345			`}`
346
347			`/*`
348			`* Get a whitespace delimited number from a string (not file) into buf`
349			`* update the start pointer to point after the number in the string.`
350			`*/`
351			`static int`
352			`getnum_str(u_char *startpp, u_char endp) {`
353			`int c, n;`
354			`int seendigit = 0;`
355			`int m = 0;`
356
357			`for (n = 0; *startpp <= endp; ) {`
358			`c = **startpp;`
359			`if (isspace(c) \|\| c == '\0') {`
360			`if (seendigit) /* trailing whitespace */`
361			`break;`
362			`else { /* leading whitespace */`
363			`(*startpp)++;`
364			`continue;`
365			`}`
366			`}`
367			`if (c == ';') {`
368			`while ((*startpp <= endp) &&`
369			`((c = **startpp) != '\n'))`
370			`(*startpp)++;`
371			`if (seendigit)`
372			`break;`
373			`continue;`
374			`}`
375			`if (!isdigit(c)) {`
376			`if (c == ')' && seendigit) {`
377			`(*startpp)--;`
378			`break;`
379			`}`
380			`return (-1);`
381			`}`
382			`(*startpp)++;`
383			`n = n * 10 + (c - '0');`
384			`seendigit = 1;`
385			`}`
386			`return (n + m);`
387			`}`
388
389			`/*`
390			`* Allocate a resource record buffer & save rr info.`
391			`*/`
392			`ns_updrec *`
393			`res_mkupdrec(int section, const char *dname,`
394			`u_int class, u_int type, u_long ttl) {`
395			`ns_updrec rrecp = (ns_updrec )calloc(1, sizeof(ns_updrec));`
396
397			`if (!rrecp \|\| !(rrecp->r_dname = strdup(dname)))`
398			`return (NULL);`
399			`rrecp->r_class = class;`
400			`rrecp->r_type = type;`
401			`rrecp->r_ttl = ttl;`
402			`rrecp->r_section = section;`
403			`return (rrecp);`
404			`}`
405
406			`/*`
407			`* Free a resource record buffer created by res_mkupdrec.`
408			`*/`
409			`void`
410			`res_freeupdrec(ns_updrec *rrecp) {`
411			`/* Note: freeing r_dp is the caller's responsibility. */`
412			`if (rrecp->r_dname != NULL)`
413			`free(rrecp->r_dname);`
414			`free(rrecp);`
415			`}`