1 | #include <stdlib.h>
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2 | #include <sys/socket.h>
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3 | #include <netinet/in.h>
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4 | #include <netdb.h>
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5 | #include <string.h>
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6 | #include "lookup.h"
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7 |
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8 | int getaddrinfo(const char *restrict host, const char *restrict serv, const struct addrinfo *restrict hint, struct addrinfo **restrict res)
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9 | {
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10 | struct service ports[MAXSERVS];
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11 | struct address addrs[MAXADDRS];
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12 | char canon[256], *outcanon;
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13 | int nservs, naddrs, nais, canon_len, i, j, k;
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14 | int family = AF_UNSPEC, flags = 0, proto = 0, socktype = 0;
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15 | struct aibuf {
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16 | struct addrinfo ai;
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17 | union sa {
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18 | struct sockaddr_in sin;
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19 | struct sockaddr_in6 sin6;
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20 | } sa;
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21 | } *out;
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22 |
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23 | if (!host && !serv) return EAI_NONAME;
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24 |
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25 | if (hint) {
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26 | family = hint->ai_family;
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27 | flags = hint->ai_flags;
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28 | proto = hint->ai_protocol;
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29 | socktype = hint->ai_socktype;
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30 |
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31 | const int mask = AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST |
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32 | AI_V4MAPPED | AI_ALL | AI_ADDRCONFIG | AI_NUMERICSERV;
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33 | if ((flags & mask) != flags)
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34 | return EAI_BADFLAGS;
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35 |
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36 | switch (family) {
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37 | case AF_INET:
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38 | case AF_INET6:
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39 | case AF_UNSPEC:
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40 | break;
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41 | default:
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42 | return EAI_FAMILY;
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43 | }
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44 | }
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45 |
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46 | nservs = __lookup_serv(ports, serv, proto, socktype, flags);
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47 | if (nservs < 0) return nservs;
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48 |
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49 | naddrs = __lookup_name(addrs, canon, host, family, flags);
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50 | if (naddrs < 0) return naddrs;
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51 |
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52 | nais = nservs * naddrs;
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53 | canon_len = strlen(canon);
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54 | out = calloc(1, nais * sizeof(*out) + canon_len + 1);
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55 | if (!out) return EAI_MEMORY;
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56 |
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57 | if (canon_len) {
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58 | outcanon = (void *)&out[nais];
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59 | memcpy(outcanon, canon, canon_len+1);
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60 | } else {
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61 | outcanon = 0;
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62 | }
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63 |
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64 | for (k=i=0; i<naddrs; i++) for (j=0; j<nservs; j++, k++) {
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65 | out[k].ai = (struct addrinfo){
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66 | .ai_family = addrs[i].family,
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67 | .ai_socktype = ports[j].socktype,
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68 | .ai_protocol = ports[j].proto,
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69 | .ai_addrlen = addrs[i].family == AF_INET
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70 | ? sizeof(struct sockaddr_in)
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71 | : sizeof(struct sockaddr_in6),
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72 | .ai_addr = (void *)&out[k].sa,
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73 | .ai_canonname = outcanon,
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74 | .ai_next = &out[k+1].ai };
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75 | switch (addrs[i].family) {
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76 | case AF_INET:
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77 | out[k].sa.sin.sin_family = AF_INET;
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78 | out[k].sa.sin.sin_port = htons(ports[j].port);
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79 | memcpy(&out[k].sa.sin.sin_addr, &addrs[i].addr, 4);
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80 | break;
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81 | case AF_INET6:
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82 | out[k].sa.sin6.sin6_family = AF_INET6;
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83 | out[k].sa.sin6.sin6_port = htons(ports[j].port);
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84 | out[k].sa.sin6.sin6_scope_id = addrs[i].scopeid;
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85 | memcpy(&out[k].sa.sin6.sin6_addr, &addrs[i].addr, 16);
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86 | break;
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87 | }
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88 | }
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89 | out[nais-1].ai.ai_next = 0;
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90 | *res = &out->ai;
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91 | return 0;
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92 | }
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