/* * 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 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 * */ #ifndef __APPLE__ #if !defined(lint) && !defined(SABER) static const char rcsid[] = "$Id: res_mkupdate.c,v 1.1 2006/03/01 19:01:38 majka Exp $"; #endif /* not lint */ #endif #ifndef __APPLE__ #include "port_before.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "res_private.h" #ifndef __APPLE__ #include "port_after.h" #endif /* 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. */ #ifdef __APPLE__ static #endif int res_protocolnumber(const char *); #ifdef __APPLE__ static #endif int res_servicenumber(const char *); /* * 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_nmkupdate(res_state statp, 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; struct in6_addr in6a; char buf2[NS_MAXDNAME]; u_char buf3[NS_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 < NS_HFIXEDSZ)) return (-1); memset(buf, 0, NS_HFIXEDSZ); hp = (HEADER *) buf; #ifdef __APPLE__ hp->id = res_randomid(); #else hp->id = htons(++statp->id); #endif hp->opcode = ns_o_update; hp->rcode = ns_r_noerror; sp1 = buf + 2*NS_INT16SZ; /* save pointer to zocount */ cp = buf + NS_HFIXEDSZ; buflen -= NS_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 != ns_s_zn) 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 == ns_s_pr) { rttl = 0; switch (rrecp->r_opcode) { case ns_r_yxdomain: rclass = ns_c_any; rtype = ns_t_any; rrecp->r_size = 0; break; case ns_r_nxdomain: rclass = ns_c_none; rtype = ns_t_any; rrecp->r_size = 0; break; case ns_r_nxrrset: rclass = ns_c_none; rrecp->r_size = 0; break; case ns_r_yxrrset: if (rrecp->r_size == 0) rclass = ns_c_any; break; default: fprintf(stderr, "res_mkupdate: incorrect opcode: %d\n", rrecp->r_opcode); fflush(stderr); return (-1); } } else if (section == ns_s_ud) { switch (rrecp->r_opcode) { case ns_uop_delete: rclass = rrecp->r_size == 0 ? ns_c_any : ns_c_none; break; case ns_uop_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*NS_INT16SZ); NS_PUT16(rtype, cp); NS_PUT16(rclass, cp); if (section == ns_s_zn) { if (numrrs != 1 || rrecp->r_type != ns_t_soa) return (-3); continue; } ShrinkBuffer(NS_INT32SZ + NS_INT16SZ); NS_PUT32(rttl, cp); sp2 = cp; /* save pointer to length byte */ cp += NS_INT16SZ; if (rrecp->r_size == 0) { if (section == ns_s_ud && rclass != ns_c_any) return (-1); else { NS_PUT16(0, sp2); continue; } } startp = rrecp->r_data; endp = startp + rrecp->r_size - 1; /* XXX this should be done centrally. */ switch (rrecp->r_type) { case ns_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(NS_INT32SZ); NS_PUT32(n1, cp); break; case ns_t_cname: case ns_t_mb: case ns_t_mg: case ns_t_mr: case ns_t_ns: case ns_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 ns_t_minfo: case ns_t_soa: case ns_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 == ns_t_soa) { ShrinkBuffer(5 * NS_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); NS_PUT32(soanum, cp); } if (multiline) { while (isspace(*startp) || !*startp) startp++; if (*startp != ')') return (-1); } } break; case ns_t_mx: case ns_t_afsdb: case ns_t_rt: n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(NS_INT16SZ); NS_PUT16(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 ns_t_srv: n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(NS_INT16SZ); NS_PUT16(n, cp); n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(NS_INT16SZ); NS_PUT16(n, cp); n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(NS_INT16SZ); NS_PUT16(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 ns_t_px: n = getnum_str(&startp, endp); if (n < 0) return (-1); NS_PUT16(n, cp); ShrinkBuffer(NS_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 ns_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(NS_INT32SZ); NS_PUT32(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 ((n1 = res_servicenumber(buf2)) <= 0) return (-1); if (n1 < MAXPORT) { bm[n1/8] |= (0x80>>(n1%8)); if (n1 > maxbm) maxbm = n1; } else return (-1); } maxbm = maxbm/8 + 1; ShrinkBuffer(maxbm); memcpy(cp, bm, maxbm); cp += maxbm; break; } case ns_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 ns_t_txt: while (1) { if ((n = getstr_str(buf2, sizeof buf2, &startp, endp)) < 0) { if (cp != (sp2 + NS_INT16SZ)) break; return (-1); } if (n > 255) return (-1); ShrinkBuffer(n+1); *cp++ = n; memcpy(cp, buf2, n); cp += n; } break; case ns_t_x25: /* RFC 1183 */ 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 ns_t_isdn: /* RFC 1183 */ 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 ns_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 ns_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(NS_INT16SZ); NS_PUT16(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(NS_INT32SZ); NS_PUT32(rttl, cp); } else { char *ulendp; u_int32_t ottl; ottl = strtoul(buf2, &ulendp, 10); if (ulendp != NULL && *ulendp != '\0') return (-1); ShrinkBuffer(NS_INT32SZ); NS_PUT32(ottl, cp); if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); exptime = ns_datetosecs(buf2, &dateerror); if (dateerror) return (-1); } /* expire */ ShrinkBuffer(NS_INT32SZ); NS_PUT32(exptime, cp); /* timesigned */ if (!getword_str(buf2, sizeof buf2, &startp, endp)) return (-1); timesigned = ns_datetosecs(buf2, &dateerror); if (!dateerror) { ShrinkBuffer(NS_INT32SZ); NS_PUT32(timesigned, cp); } else return (-1); /* footprint */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(NS_INT16SZ); NS_PUT16(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(NS_INT16SZ); NS_PUT16(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, dnptrs, lastdnptr); if (n < 0) return (-1); cp += n; ShrinkBuffer(n); maxtype = 0; memset(data, 0, sizeof data); while (1) { 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(NS_INT16SZ); NS_PUT16(n, cp); /* key tag */ n = getnum_str(&startp, endp); if (n < 0) return (-1); ShrinkBuffer(NS_INT16SZ); NS_PUT16(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; default: return (-1); } /*switch*/ n = (u_int16_t)((cp - sp2) - NS_INT16SZ); NS_PUT16(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 16 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 = 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); } 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. */ #ifdef __APPLE__ static #endif 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. */ #ifdef __APPLE__ static #endif 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); }