Re: [libvirt] [PATCH v5 7/9] Implement _nss_libvirt_gethostbyname4_r

This function is a different beast compared to previous ones. But yet again, nothing surprising is happening here. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- tools/nss/libvirt_nss.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++ tools/nss/libvirt_nss.h | 4 ++ tools/nss/libvirt_nss.syms | 1 + 3 files changed, 97 insertions(+) diff --git a/tools/nss/libvirt_nss.c b/tools/nss/libvirt_nss.c index 1b9ccba..9b80ace 100644 --- a/tools/nss/libvirt_nss.c +++ b/tools/nss/libvirt_nss.c @@ -364,3 +364,95 @@ _nss_libvirt_gethostbyname3_r(const char *name, int af, struct hostent *result, VIR_FREE(addr); return ret; } + +enum nss_status +_nss_libvirt_gethostbyname4_r(const char *name, struct gaih_addrtuple **pat, + char *buffer, size_t buflen, int *errnop, + int *herrnop, int32_t *ttlp) +{ + enum nss_status ret = NSS_STATUS_UNAVAIL; + leaseAddress *addr = NULL; + size_t naddr, i; + bool found = false; + int r; + size_t nameLen, need, idx; + struct gaih_addrtuple *r_tuple, *r_tuple_first = NULL; + char *r_name; + + if ((r = findLease(name, AF_UNSPEC, &addr, &naddr, &found, errnop)) < 0) { + /* Error occurred. Return immediately. */ + if (*errnop == EAGAIN) { + *herrnop = TRY_AGAIN; + return NSS_STATUS_TRYAGAIN; + } else { + *herrnop = NO_RECOVERY; + return NSS_STATUS_UNAVAIL; + } + } + + if (!found) { + /* NOT found */ + *errnop = ESRCH; + *herrnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } else if (!naddr) { + /* Found, but no data */ + *errnop = ENXIO; + *herrnop = NO_DATA; + return NSS_STATUS_UNAVAIL; + } + + /* Found and have data */ + + nameLen = strlen(name); + /* We need space for: + * a) name + * b) address */ + need = ALIGN(nameLen + 1) + ALIGN(sizeof(struct gaih_addrtuple)); +

+ if (buflen < need) { + *errnop = ENOMEM; + *herrnop = TRY_AGAIN; + ret = NSS_STATUS_TRYAGAIN; + goto cleanup; + } + + /* First, append name */ + r_name = buffer; + memcpy(r_name, name, nameLen + 1); + idx = ALIGN(nameLen + 1); + + + /* Second, append addresses */ + r_tuple_first = (struct gaih_addrtuple*) (buffer + idx); + for (i = 0; i < naddr; i++) { + int family = addr[i].af; + + r_tuple = (struct gaih_addrtuple*) (buffer + idx); + r_tuple->next = i == naddr - 1 ? NULL : (struct gaih_addrtuple*) ((char*) r_tuple + ALIGN(sizeof(struct gaih_addrtuple)));