/* $NetBSD: res_mkupdate.c,v 1.1.1.2 2012/09/09 16:08:09 christos Exp $ */ /* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 1996-1999 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 ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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. */ /*! \file * \brief * Based on the Dynamic DNS reference implementation by Viraj Bais * <viraj_bais@ccm.fm.intel.com> */ #if !defined(lint) && !defined(SABER) static const char rcsid[] = "Id: res_mkupdate.c,v 1.10 2008/12/11 09:59:00 marka Exp "; #endif /* not lint */ #include "port_before.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "port_after.h" /* Options. Leave them on. */ #define DEBUG #define MAXPORT 1024 static int getnum_str(u_char **, u_char *); static int gethexnum_str(u_char **, u_char *); static int getword_str(char *, int, u_char **, u_char *); static int getstr_str(char *, int, u_char **, u_char *); #define ShrinkBuffer(x) if ((buflen -= x) < 0) return (-2); /* Forward. */ int res_protocolnumber(const char *); int res_servicenumber(const char *); /*% * Form update packets. * Returns the size of the resulting packet if no error * * On error, * returns *\li -1 if error in reading a word/number in rdata * portion for update packets *\li -2 if length of buffer passed is insufficient *\li -3 if zone section is not the first section in * the linked list, or section order has a problem *\li -4 on a number overflow *\li -5 unknown operation or no records */ int res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) { ns_updrec *rrecp_start = rrecp_in; HEADER *hp; u_char *cp, *sp2, *startp, *endp; int n, i, soanum, multiline; ns_updrec *rrecp; struct in_addr ina; struct in6_addr in6a; char buf2[MAXDNAME]; u_char buf3[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; int siglen, keylen, certlen; /* * Initialize header fields. */ if ((buf == NULL) || (buflen < HFIXEDSZ)) return (-1); memset(buf, 0, HFIXEDSZ); hp = (HEADER *) buf; statp->id = res_nrandomid(statp); hp->id = htons(statp->id); hp->opcode = ns_o_update; hp->rcode = NOERROR; 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 = NEXT(rrecp, r_glink)) { 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: case ns_t_dname: 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); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); 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_SRV: n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); n = dn_comp(buf2, cp, buflen, NULL, NULL); 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: { char bm[MAXPORT/8]; unsigned int maxbm = 0; 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); if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); if ((i = res_protocolnumber(buf2)) < 0) return (-1); ShrinkBuffer(1); *cp++ = i & 0xff; for (i = 0; i < MAXPORT/8 ; i++) bm[i] = 0; while (getword_str(buf2, sizeof buf2, &startp, endp)) { if ((n = res_servicenumber(buf2)) <= 0) return (-1); if (n < MAXPORT) { bm[n/8] |= (0x80>>(n%8)); if ((unsigned)n > maxbm) maxbm = n; } else return (-1); } maxbm = maxbm/8 + 1; ShrinkBuffer(maxbm); memcpy(cp, bm, maxbm); cp += maxbm; break; } case T_HINFO: for (i = 0; i < 2; i++) { if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) return (-1); if (n > 255) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; } break; case T_TXT: for (;;) { if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) { if (cp != (sp2 + INT16SZ)) break; return (-1); } if (n > 255) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; } break; case T_X25: /* RFC1183 */ if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) return (-1); if (n > 255) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; break; case T_ISDN: /* RFC1183 */ if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) return (-1); if ((n > 255) || (n == 0)) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) n = 0; if (n > 255) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; break; case T_NSAP: if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) { ShrinkBuffer(n); memcpy(cp, buf2, n); cp += n; } else { return (-1); } break; case T_LOC: if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) { ShrinkBuffer(n); memcpy(cp, buf2, n); cp += n; } else return (-1); break; case ns_t_sig: { int sig_type, success, dateerror; u_int32_t exptime, timesigned; /* type */ if ((n = getword_str(buf2, sizeof buf2, &startp, endp)) < 0) return (-1); sig_type = sym_ston(__p_type_syms, buf2, &success); if (!success || sig_type == ns_t_any) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(sig_type, cp); /* alg */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(1); *cp++ = n; /* labels */ n = getnum_str(&startp, endp); if (n <= 0 || n > 255) return (-1); ShrinkBuffer(1); *cp++ = n; /* ottl & expire */ if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); exptime = ns_datetosecs(buf2, &dateerror); if (!dateerror) { ShrinkBuffer(INT32SZ); PUTLONG(rttl, cp); } else { char *ulendp; u_int32_t ottl; errno = 0; ottl = strtoul(buf2, &ulendp, 10); if (errno != 0 || (ulendp != NULL && *ulendp != '\0')) return (-1); ShrinkBuffer(INT32SZ); PUTLONG(ottl, cp); if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); exptime = ns_datetosecs(buf2, &dateerror); if (dateerror) return (-1); } /* expire */ ShrinkBuffer(INT32SZ); PUTLONG(exptime, cp); /* timesigned */ if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); timesigned = ns_datetosecs(buf2, &dateerror); if (!dateerror) { ShrinkBuffer(INT32SZ); PUTLONG(timesigned, cp); } else return (-1); /* footprint */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); /* signer name */ 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); /* sig */ if ((n = getword_str(buf2, sizeof buf2, &startp, endp)) < 0) return (-1); siglen = b64_pton(buf2, buf3, sizeof(buf3)); if (siglen < 0) return (-1); ShrinkBuffer(siglen); memcpy(cp, buf3, siglen); cp += siglen; break; } case ns_t_key: /* flags */ n = gethexnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); /* proto */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(1); *cp++ = n; /* alg */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(1); *cp++ = n; /* key */ if ((n = getword_str(buf2, sizeof buf2, &startp, endp)) < 0) return (-1); keylen = b64_pton(buf2, buf3, sizeof(buf3)); if (keylen < 0) return (-1); ShrinkBuffer(keylen); memcpy(cp, buf3, keylen); cp += keylen; break; case ns_t_nxt: { int success, nxt_type; u_char data[32]; int maxtype; /* next name */ if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); n = dn_comp(buf2, cp, buflen, NULL, NULL); if (n < 0) return (-1); cp += n; ShrinkBuffer(n); maxtype = 0; memset(data, 0, sizeof data); for (;;) { if (!getword_str(buf2, sizeof buf2, &startp, endp)) break; nxt_type = sym_ston(__p_type_syms, buf2, &success); if (!success || !ns_t_rr_p(nxt_type)) return (-1); NS_NXT_BIT_SET(nxt_type, data); if (nxt_type > maxtype) maxtype = nxt_type; } n = maxtype/NS_NXT_BITS+1; ShrinkBuffer(n); memcpy(cp, data, n); cp += n; break; } case ns_t_cert: /* type */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); /* key tag */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); /* alg */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(1); *cp++ = n; /* cert */ if ((n = getword_str(buf2, sizeof buf2, &startp, endp)) < 0) return (-1); certlen = b64_pton(buf2, buf3, sizeof(buf3)); if (certlen < 0) return (-1); ShrinkBuffer(certlen); memcpy(cp, buf3, certlen); cp += certlen; break; case ns_t_aaaa: if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); if (inet_pton(AF_INET6, buf2, &in6a) <= 0) return (-1); ShrinkBuffer(NS_IN6ADDRSZ); memcpy(cp, &in6a, NS_IN6ADDRSZ); cp += NS_IN6ADDRSZ; break; case ns_t_naptr: /* Order Preference Flags Service Replacement Regexp */ /* Order */ n = getnum_str(&startp, endp); if (n < 0 || n > 65535) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); /* Preference */ n = getnum_str(&startp, endp); if (n < 0 || n > 65535) return (-1); ShrinkBuffer(INT16SZ); PUTSHORT(n, cp); /* Flags */ if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) { return (-1); } if (n > 255) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; /* Service Classes */ if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) { return (-1); } if (n > 255) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; /* Pattern */ if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) { return (-1); } if (n > 255) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; /* Replacement */ if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); n = dn_comp(buf2, cp, buflen, NULL, NULL); if (n < 0) return (-1); cp += n; ShrinkBuffer(n); 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 white spae delimited string from memory. Process quoted strings * and \\DDD escapes. Return length or -1 on error. Returned string may * contain nulls. */ static char digits[] = "0123456789"; static int getstr_str(char *buf, int size, u_char **startpp, u_char *endp) { char *cp; int c, c1 = 0; int inquote = 0; int seen_quote = 0; int escape = 0; int dig = 0; for (cp = buf; *startpp <= endp; ) { if ((c = **startpp) == '\0') break; /* leading white space */ if ((cp == buf) && !seen_quote && isspace(c)) { (*startpp)++; continue; } switch (c) { case '\\': if (!escape) { escape = 1; dig = 0; c1 = 0; (*startpp)++; continue; } goto do_escape; case '"': if (!escape) { inquote = !inquote; seen_quote = 1; (*startpp)++; continue; } /* fall through */ default: do_escape: if (escape) { switch (c) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': c1 = c1 * 10 + (strchr(digits, c) - digits); if (++dig == 3) { c = c1 &0xff; break; } (*startpp)++; continue; } escape = 0; } else if (!inquote && isspace(c)) goto done; if (cp >= buf+size-1) goto done; *cp++ = (u_char)c; (*startpp)++; } } done: *cp = '\0'; return ((cp == buf)? (seen_quote? 0: -1): (cp - buf)); } /*% * Get a whitespace delimited base 16 number from a string (not file) into buf * update the start pointer to point after the number in the string. */ static int gethexnum_str(u_char **startpp, u_char *endp) { int c, n; int seendigit = 0; int m = 0; if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0) return getnum_str(startpp, endp); (*startpp)+=2; 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 (!isxdigit(c)) { if (c == ')' && seendigit) { (*startpp)--; break; } return (-1); } (*startpp)++; if (isdigit(c)) n = n * 16 + (c - '0'); else n = n * 16 + (tolower(c) - 'a' + 10); seendigit = 1; } return (n + m); } /*% * Get a whitespace delimited base 10 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))) { if (rrecp) free((char *)rrecp); return (NULL); } INIT_LINK(rrecp, r_link); INIT_LINK(rrecp, r_glink); rrecp->r_class = (ns_class)class; rrecp->r_type = (ns_type)type; rrecp->r_ttl = ttl; rrecp->r_section = (ns_sect)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); } struct valuelist { struct valuelist * next; struct valuelist * prev; char * name; char * proto; int port; }; static struct valuelist *servicelist, *protolist; static void res_buildservicelist() { struct servent *sp; struct valuelist *slp; #ifdef MAYBE_HESIOD setservent(0); #else setservent(1); #endif while ((sp = getservent()) != NULL) { slp = (struct valuelist *)malloc(sizeof(struct valuelist)); if (!slp) break; slp->name = strdup(sp->s_name); slp->proto = strdup(sp->s_proto); if ((slp->name == NULL) || (slp->proto == NULL)) { if (slp->name) free(slp->name); if (slp->proto) free(slp->proto); free(slp); break; } slp->port = ntohs((u_int16_t)sp->s_port); /*%< host byt order */ slp->next = servicelist; slp->prev = NULL; if (servicelist) servicelist->prev = slp; servicelist = slp; } endservent(); } void res_destroyservicelist() { struct valuelist *slp, *slp_next; for (slp = servicelist; slp != NULL; slp = slp_next) { slp_next = slp->next; free(slp->name); free(slp->proto); free(slp); } servicelist = (struct valuelist *)0; } void res_buildprotolist(void) { struct protoent *pp; struct valuelist *slp; #ifdef MAYBE_HESIOD setprotoent(0); #else setprotoent(1); #endif while ((pp = getprotoent()) != NULL) { slp = (struct valuelist *)malloc(sizeof(struct valuelist)); if (!slp) break; slp->name = strdup(pp->p_name); if (slp->name == NULL) { free(slp); break; } slp->port = pp->p_proto; /*%< host byte order */ slp->next = protolist; slp->prev = NULL; if (protolist) protolist->prev = slp; protolist = slp; } endprotoent(); } void res_destroyprotolist(void) { struct valuelist *plp, *plp_next; for (plp = protolist; plp != NULL; plp = plp_next) { plp_next = plp->next; free(plp->name); free(plp); } protolist = (struct valuelist *)0; } static int findservice(const char *s, struct valuelist **list) { struct valuelist *lp = *list; int n; for (; lp != NULL; lp = lp->next) if (strcasecmp(lp->name, s) == 0) { if (lp != *list) { lp->prev->next = lp->next; if (lp->next) lp->next->prev = lp->prev; (*list)->prev = lp; lp->next = *list; *list = lp; } return (lp->port); /*%< host byte order */ } if (sscanf(s, "%d", &n) != 1 || n <= 0) n = -1; return (n); } /*% * Convert service name or (ascii) number to int. */ int res_servicenumber(const char *p) { if (servicelist == (struct valuelist *)0) res_buildservicelist(); return (findservice(p, &servicelist)); } /*% * Convert protocol name or (ascii) number to int. */ int res_protocolnumber(const char *p) { if (protolist == (struct valuelist *)0) res_buildprotolist(); return (findservice(p, &protolist)); } static struct servent * cgetservbyport(u_int16_t port, const char *proto) { /*%< Host byte order. */ struct valuelist **list = &servicelist; struct valuelist *lp = *list; static struct servent serv; port = ntohs(port); for (; lp != NULL; lp = lp->next) { if (port != (u_int16_t)lp->port) /*%< Host byte order. */ continue; if (strcasecmp(lp->proto, proto) == 0) { if (lp != *list) { lp->prev->next = lp->next; if (lp->next) lp->next->prev = lp->prev; (*list)->prev = lp; lp->next = *list; *list = lp; } serv.s_name = lp->name; serv.s_port = htons((u_int16_t)lp->port); serv.s_proto = lp->proto; return (&serv); } } return (0); } static struct protoent * cgetprotobynumber(int proto) { /*%< Host byte order. */ struct valuelist **list = &protolist; struct valuelist *lp = *list; static struct protoent prot; for (; lp != NULL; lp = lp->next) if (lp->port == proto) { /*%< Host byte order. */ if (lp != *list) { lp->prev->next = lp->next; if (lp->next) lp->next->prev = lp->prev; (*list)->prev = lp; lp->next = *list; *list = lp; } prot.p_name = lp->name; prot.p_proto = lp->port; /*%< Host byte order. */ return (&prot); } return (0); } const char * res_protocolname(int num) { static char number[8]; struct protoent *pp; if (protolist == (struct valuelist *)0) res_buildprotolist(); pp = cgetprotobynumber(num); if (pp == 0) { (void) sprintf(number, "%d", num); return (number); } return (pp->p_name); } const char * res_servicename(u_int16_t port, const char *proto) { /*%< Host byte order. */ static char number[8]; struct servent *ss; if (servicelist == (struct valuelist *)0) res_buildservicelist(); ss = cgetservbyport(htons(port), proto); if (ss == 0) { (void) sprintf(number, "%d", port); return (number); } return (ss->s_name); }