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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [res_mkupdate.c] - Rev 773
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/* * 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); }
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