Mercurial > hg > dhcpcd
changeset 2501:13ac6faaa12d draft
Fix compiler warning
| author | Roy Marples <roy@marples.name> |
|---|---|
| date | Fri, 30 May 2014 22:03:50 +0000 |
| parents | 28b90a83ae19 |
| children | 646d266e217f |
| files | ipv6.c test/test_hmac_md5.c |
| diffstat | 2 files changed, 51 insertions(+), 1 deletions(-) [+] |
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--- a/ipv6.c Fri May 30 22:02:16 2014 +0000 +++ b/ipv6.c Fri May 30 22:03:50 2014 +0000 @@ -379,6 +379,56 @@ return 0; } +int +ipv6_makestableprivate(struct in6_addr *addr, + const struct in6_addr *prefix, int prefix_len, + const unsigned char *netiface, size_t netiface_len, + const unsigned char *netid, size_t netid_len, + uint32_t dad_counter, + const char *secret, size_t secret_len) +{ + unsigned char buf[2048], digest[SHA256_DIGEST_STRING_LENGTH]; + size_t len, l; + SHA256_CTX ctx; + + if (prefix_len < 0 || prefix_len > 120) { + errno = EINVAL; + return -1; + } + + l = ROUNDUP8(prefix_len); + len = l + netiface_len + netid_len + sizeof(dad_counter) + secret_len; + if (len > sizeof(buf)) { + errno = ENOBUF; + return -1; + } + + /* Combine all parameters into one buffer */ + p = buf; + memcpy(p, prefix, l); + p += l; + memcpy(p, netiface, netiface_len); + p += netiface_len; + memcpy(p, netid, netid_len); + p += netid_len; + memcpy(p, dad_counter, sizeof(dad_counter)); + p += sizeof(dad_counter); + memcpy(p, secret, secret_len); + + /* Make an address using the prefix and the digest of the above. + * RFC7212 Section 5.1 states that we shouldn't use MD5. + * Pity as we use that for HMAC-MD5 which is still deemed OK. + * SHA-256 is recommended */ + SHA256_Init(&ctx); + SHA256_Update(&ctx, buf, len); + SHA256_Final(digest, &ctx); + + memcpy(addr->s6_addr, prefix, l); + l = 128 - l; + memcpy(addr->s6_addr + l, hash, 128 - l); + return 0; +} + #ifdef IPV6_POLLADDRFLAG void ipv6_checkaddrflags(void *arg)