diff options
Diffstat (limited to 'sysdeps/posix/getaddrinfo.c')
| -rw-r--r-- | sysdeps/posix/getaddrinfo.c | 214 |
1 files changed, 201 insertions, 13 deletions
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c index 8a87af8a68..e8f4099b7f 100644 --- a/sysdeps/posix/getaddrinfo.c +++ b/sysdeps/posix/getaddrinfo.c @@ -1014,6 +1014,38 @@ struct sort_result_combo }; +#if __BYTE_ORDER == __BIG_ENDIAN +# define htonl_c(n) n +#else +# define htonl_c(n) __bswap_constant_32 (n) +#endif + +static const struct scopeentry +{ + union + { + char addr[4]; + uint32_t addr32; + }; + uint32_t netmask; + int32_t scope; +} default_scopes[] = + { + /* Link-local addresses: scope 2. */ + { { { 169, 254, 0, 0 } }, htonl_c (0xffff0000), 2 }, + { { { 127, 0, 0, 0 } }, htonl_c (0xff000000), 2 }, + /* Site-local addresses: scope 5. */ + { { { 10, 0, 0, 0 } }, htonl_c (0xff000000), 5 }, + { { { 172, 16, 0, 0 } }, htonl_c (0xfff00000), 5 }, + { { { 192, 168, 0, 0 } }, htonl_c (0xffff0000), 5 }, + /* Default: scope 14. */ + { { { 0, 0, 0, 0 } }, htonl_c (0x00000000), 14 } + }; + +/* The label table. */ +static const struct scopeentry *scopes; + + static int get_scope (const struct sockaddr_storage *ss) { @@ -1038,17 +1070,17 @@ get_scope (const struct sockaddr_storage *ss) else if (ss->ss_family == PF_INET) { const struct sockaddr_in *in = (const struct sockaddr_in *) ss; - const uint8_t *addr = (const uint8_t *) &in->sin_addr; - - /* RFC 3484 specifies how to map IPv6 addresses to scopes. - 169.254/16 and 127/8 are link-local. */ - if ((addr[0] == 169 && addr[1] == 254) || addr[0] == 127) - scope = 2; - else if (addr[0] == 10 || (addr[0] == 172 && (addr[1] & 0xf0) == 16) - || (addr[0] == 192 && addr[1] == 168)) - scope = 5; - else - scope = 14; + + size_t cnt = 0; + while (1) + { + if ((in->sin_addr.s_addr & scopes[cnt].netmask) + == scopes[cnt].addr32) + return scopes[cnt].scope; + + ++cnt; + } + /* NOTREACHED */ } else /* XXX What is a good default? */ @@ -1490,6 +1522,13 @@ libc_freeres_fn(fini) precedence = default_precedence; free ((void *) old); } + + if (scopes != default_scopes) + { + const struct scopeentry *old = scopes; + scopes = default_scopes; + free ((void *) old); + } } @@ -1500,6 +1539,13 @@ struct prefixlist }; +struct scopelist +{ + struct scopeentry entry; + struct scopelist *next; +}; + + static void free_prefixlist (struct prefixlist *list) { @@ -1512,6 +1558,18 @@ free_prefixlist (struct prefixlist *list) } +static void +free_scopelist (struct scopelist *list) +{ + while (list != NULL) + { + struct scopelist *oldp = list; + list = list->next; + free (oldp); + } +} + + static int prefixcmp (const void *p1, const void *p2) { @@ -1526,6 +1584,20 @@ prefixcmp (const void *p1, const void *p2) } +static int +scopecmp (const void *p1, const void *p2) +{ + const struct scopeentry *e1 = (const struct scopeentry *) p1; + const struct scopeentry *e2 = (const struct scopeentry *) p2; + + if (e1->netmask > e2->netmask) + return -1; + if (e1->netmask == e2->netmask) + return 0; + return 1; +} + + static void gaiconf_init (void) { @@ -1535,6 +1607,9 @@ gaiconf_init (void) struct prefixlist *precedencelist = NULL; size_t nprecedencelist = 0; bool precedencelist_nullbits = false; + struct scopelist *scopelist = NULL; + size_t nscopelist = 0; + bool scopelist_nullbits = false; FILE *fp = fopen (GAICONF_FNAME, "rc"); if (fp != NULL) @@ -1625,7 +1700,7 @@ gaiconf_init (void) || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX || errno != ERANGE) && *endp == '\0' - && bits <= INT_MAX + && bits <= 128 && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX || errno != ERANGE) && *endp == '\0' @@ -1659,6 +1734,73 @@ gaiconf_init (void) } break; + case 7: + if (strcmp (cmd, "scopev4") == 0) + { + struct in6_addr prefix; + unsigned long int bits; + unsigned long int val; + char *endp; + + bits = 32; + __set_errno (0); + cp = strchr (val1, '/'); + if (cp != NULL) + *cp++ = '\0'; + if (inet_pton (AF_INET6, val1, &prefix)) + { + if (IN6_IS_ADDR_V4MAPPED (&prefix) + && (cp == NULL + || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX + || errno != ERANGE) + && *endp == '\0' + && bits >= 96 + && bits <= 128 + && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX + || errno != ERANGE) + && *endp == '\0' + && val <= INT_MAX) + { + struct scopelist *newp; + new_scope: + newp = malloc (sizeof (*newp)); + if (newp == NULL) + { + free (line); + fclose (fp); + goto no_file; + } + + newp->entry.netmask = htonl (bits != 96 + ? (0xffffffff + << (128 - bits)) + : 0); + newp->entry.addr32 = (prefix.s6_addr32[3] + & newp->entry.netmask); + newp->entry.scope = val; + newp->next = scopelist; + scopelist = newp; + ++nscopelist; + scopelist_nullbits |= bits == 96; + } + } + else if (inet_pton (AF_INET, val1, &prefix.s6_addr32[3]) + && (cp == NULL + || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX + || errno != ERANGE) + && *endp == '\0' + && bits <= 32 + && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX + || errno != ERANGE) + && *endp == '\0' + && val <= INT_MAX) + { + bits += 96; + goto new_scope; + } + } + break; + case 10: if (strcmp (cmd, "precedence") == 0) { @@ -1742,12 +1884,52 @@ gaiconf_init (void) /* Sort the entries so that the most specific ones are at the beginning. */ - qsort (new_precedence, nprecedencelist, sizeof (*new_labels), + qsort (new_precedence, nprecedencelist, sizeof (*new_precedence), prefixcmp); } else new_precedence = (struct prefixentry *) default_precedence; + struct scopeentry *new_scopes; + if (nscopelist > 0) + { + if (!scopelist_nullbits) + ++nscopelist; + new_scopes = malloc (nscopelist * sizeof (*new_scopes)); + if (new_scopes == NULL) + { + if (new_labels != default_labels) + free (new_labels); + if (new_precedence != default_precedence) + free (new_precedence); + goto no_file; + } + + int i = nscopelist; + if (!scopelist_nullbits) + { + --i; + new_scopes[i].addr32 = 0; + new_scopes[i].netmask = 0; + new_scopes[i].scope = 14; + } + + struct scopelist *l = scopelist; + while (i-- > 0) + { + new_scopes[i] = l->entry; + l = l->next; + } + free_scopelist (scopelist); + + /* Sort the entries so that the most specific ones are at + the beginning. */ + qsort (new_scopes, nscopelist, sizeof (*new_scopes), + scopecmp); + } + else + new_scopes = (struct scopeentry *) default_scopes; + /* Now we are ready to replace the values. */ const struct prefixentry *old = labels; labels = new_labels; @@ -1759,6 +1941,11 @@ gaiconf_init (void) if (old != default_precedence) free ((void *) old); + const struct scopeentry *oldscope = scopes; + scopes = new_scopes; + if (oldscope != default_scopes) + free ((void *) oldscope); + gaiconf_mtime = st.st_mtim; } else @@ -1766,6 +1953,7 @@ gaiconf_init (void) no_file: free_prefixlist (labellist); free_prefixlist (precedencelist); + free_scopelist (scopelist); /* If we previously read the file but it is gone now, free the old data and use the builtin one. Leave the reload flag |