1 | #define _GNU_SOURCE
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2 |
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3 | #include <sys/socket.h>
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4 | #include <netdb.h>
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5 | #include <string.h>
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6 | #include <netinet/in.h>
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7 | #include <errno.h>
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8 | #include <stdint.h>
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9 | #include "lookup.h"
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10 |
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11 | int gethostbyname2_r(const char *name, int af,
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12 | struct hostent *h, char *buf, size_t buflen,
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13 | struct hostent **res, int *err)
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14 | {
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15 | struct address addrs[MAXADDRS];
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16 | char canon[256];
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17 | int i, cnt;
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18 | size_t align, need;
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19 |
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20 | *res = 0;
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21 | cnt = __lookup_name(addrs, canon, name, af, AI_CANONNAME);
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22 | if (cnt<0) switch (cnt) {
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23 | case EAI_NONAME:
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24 | *err = HOST_NOT_FOUND;
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25 | return ENOENT;
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26 | case EAI_AGAIN:
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27 | *err = TRY_AGAIN;
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28 | return EAGAIN;
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29 | default:
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30 | case EAI_FAIL:
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31 | *err = NO_RECOVERY;
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32 | return EBADMSG;
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33 | case EAI_MEMORY:
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34 | case EAI_SYSTEM:
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35 | *err = NO_RECOVERY;
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36 | return errno;
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37 | }
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38 |
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39 | h->h_addrtype = af;
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40 | h->h_length = af==AF_INET6 ? 16 : 4;
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41 |
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42 | /* Align buffer */
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43 | align = -(uintptr_t)buf & sizeof(char *)-1;
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44 |
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45 | need = 4*sizeof(char *);
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46 | need += (cnt + 1) * (sizeof(char *) + h->h_length);
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47 | need += strlen(name)+1;
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48 | need += strlen(canon)+1;
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49 | need += align;
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50 |
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51 | if (need > buflen) return ERANGE;
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52 |
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53 | buf += align;
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54 | h->h_aliases = (void *)buf;
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55 | buf += 3*sizeof(char *);
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56 | h->h_addr_list = (void *)buf;
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57 | buf += (cnt+1)*sizeof(char *);
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58 |
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59 | for (i=0; i<cnt; i++) {
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60 | h->h_addr_list[i] = (void *)buf;
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61 | buf += h->h_length;
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62 | memcpy(h->h_addr_list[i], addrs[i].addr, h->h_length);
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63 | }
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64 | h->h_addr_list[i] = 0;
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65 |
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66 | h->h_name = h->h_aliases[0] = buf;
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67 | strcpy(h->h_name, canon);
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68 | buf += strlen(h->h_name)+1;
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69 |
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70 | if (strcmp(h->h_name, name)) {
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71 | h->h_aliases[1] = buf;
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72 | strcpy(h->h_aliases[1], name);
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73 | buf += strlen(h->h_aliases[1])+1;
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74 | } else h->h_aliases[1] = 0;
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75 |
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76 | h->h_aliases[2] = 0;
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77 |
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78 | *res = h;
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79 | return 0;
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80 | }
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