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92 lines
2.4 KiB
92 lines
2.4 KiB
#include <stdlib.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <string.h>
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#include "lookup.h"
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int getaddrinfo(const char *restrict host, const char *restrict serv, const struct addrinfo *restrict hint, struct addrinfo **restrict res)
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{
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struct service ports[MAXSERVS];
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struct address addrs[MAXADDRS];
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char canon[256], *outcanon;
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int nservs, naddrs, nais, canon_len, i, j, k;
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int family = AF_UNSPEC, flags = 0, proto = 0, socktype = 0;
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struct aibuf {
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struct addrinfo ai;
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union sa {
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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} sa;
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} *out;
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if (!host && !serv) return EAI_NONAME;
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if (hint) {
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family = hint->ai_family;
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flags = hint->ai_flags;
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proto = hint->ai_protocol;
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socktype = hint->ai_socktype;
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const int mask = AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST |
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AI_V4MAPPED | AI_ALL | AI_ADDRCONFIG | AI_NUMERICSERV;
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if ((flags & mask) != flags)
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return EAI_BADFLAGS;
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switch (family) {
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case AF_INET:
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case AF_INET6:
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case AF_UNSPEC:
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break;
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default:
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return EAI_FAMILY;
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}
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}
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nservs = __lookup_serv(ports, serv, proto, socktype, flags);
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if (nservs < 0) return nservs;
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naddrs = __lookup_name(addrs, canon, host, family, flags);
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if (naddrs < 0) return naddrs;
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nais = nservs * naddrs;
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canon_len = strlen(canon);
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out = calloc(1, nais * sizeof(*out) + canon_len + 1);
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if (!out) return EAI_MEMORY;
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if (canon_len) {
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outcanon = (void *)&out[nais];
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memcpy(outcanon, canon, canon_len+1);
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} else {
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outcanon = 0;
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}
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for (k=i=0; i<naddrs; i++) for (j=0; j<nservs; j++, k++) {
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out[k].ai = (struct addrinfo){
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.ai_family = addrs[i].family,
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.ai_socktype = ports[j].socktype,
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.ai_protocol = ports[j].proto,
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.ai_addrlen = addrs[i].family == AF_INET
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? sizeof(struct sockaddr_in)
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: sizeof(struct sockaddr_in6),
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.ai_addr = (void *)&out[k].sa,
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.ai_canonname = outcanon,
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.ai_next = &out[k+1].ai };
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switch (addrs[i].family) {
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case AF_INET:
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out[k].sa.sin.sin_family = AF_INET;
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out[k].sa.sin.sin_port = htons(ports[j].port);
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memcpy(&out[k].sa.sin.sin_addr, &addrs[i].addr, 4);
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break;
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case AF_INET6:
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out[k].sa.sin6.sin6_family = AF_INET6;
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out[k].sa.sin6.sin6_port = htons(ports[j].port);
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out[k].sa.sin6.sin6_scope_id = addrs[i].scopeid;
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memcpy(&out[k].sa.sin6.sin6_addr, &addrs[i].addr, 16);
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break;
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}
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}
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out[nais-1].ai.ai_next = 0;
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*res = &out->ai;
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return 0;
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}
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