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network: Separate DHCP config generator into a function
Generating configuration file for dnsmasq is done in networkDnsmasqConfContents() which is this big, self-contained function. Separate at least DHCP part into its own function for better readability. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik
parent
314dac422d
commit
bab462db6e
@ -994,6 +994,123 @@ networkDnsmasqConfLocalPTRs(virBuffer *buf,
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}
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static int
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networkDnsmasqConfDHCP(virBuffer *buf,
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virNetworkIPDef *ipdef,
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const char *bridge,
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int *nbleases,
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dnsmasqContext *dctx)
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{
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int r;
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int prefix;
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if (!ipdef)
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return 0;
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prefix = virNetworkIPDefPrefix(ipdef);
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if (prefix < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("bridge '%s' has an invalid prefix"),
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bridge);
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return -1;
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}
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for (r = 0; r < ipdef->nranges; r++) {
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int thisRange;
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virNetworkDHCPRangeDef range = ipdef->ranges[r];
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g_autofree char *leasetime = NULL;
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g_autofree char *saddr = NULL;
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g_autofree char *eaddr = NULL;
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if (!(saddr = virSocketAddrFormat(&range.addr.start)) ||
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!(eaddr = virSocketAddrFormat(&range.addr.end)))
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return -1;
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if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6)) {
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virBufferAsprintf(buf, "dhcp-range=%s,%s,%d",
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saddr, eaddr, prefix);
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} else {
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/* IPv4 - dnsmasq requires a netmask rather than prefix */
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virSocketAddr netmask;
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g_autofree char *netmaskStr = NULL;
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if (virSocketAddrPrefixToNetmask(prefix, &netmask, AF_INET) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Failed to translate bridge '%s' "
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"prefix %d to netmask"),
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bridge, prefix);
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return -1;
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}
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if (!(netmaskStr = virSocketAddrFormat(&netmask)))
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return -1;
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virBufferAsprintf(buf, "dhcp-range=%s,%s,%s",
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saddr, eaddr, netmaskStr);
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}
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if ((leasetime = networkBuildDnsmasqLeaseTime(range.lease)))
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virBufferAsprintf(buf, ",%s", leasetime);
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virBufferAddLit(buf, "\n");
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thisRange = virSocketAddrGetRange(&range.addr.start,
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&range.addr.end,
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&ipdef->address,
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virNetworkIPDefPrefix(ipdef));
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if (thisRange < 0)
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return -1;
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*nbleases += thisRange;
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}
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/*
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* For static-only DHCP, i.e. with no range but at least one
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* host element, we have to add a special --dhcp-range option
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* to enable the service in dnsmasq. (this is for dhcp-hosts=
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* support)
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*/
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if (!ipdef->nranges && ipdef->nhosts) {
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g_autofree char *bridgeaddr = virSocketAddrFormat(&ipdef->address);
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if (!bridgeaddr)
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return -1;
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virBufferAsprintf(buf, "dhcp-range=%s,static",
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bridgeaddr);
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if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6))
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virBufferAsprintf(buf, ",%d", prefix);
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virBufferAddLit(buf, "\n");
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}
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if (networkBuildDnsmasqDhcpHostsList(dctx, ipdef) < 0)
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return -1;
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/* Note: the following is IPv4 only */
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if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET)) {
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if (ipdef->nranges || ipdef->nhosts) {
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virBufferAddLit(buf, "dhcp-no-override\n");
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virBufferAddLit(buf, "dhcp-authoritative\n");
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}
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if (ipdef->tftproot) {
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virBufferAddLit(buf, "enable-tftp\n");
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virBufferAsprintf(buf, "tftp-root=%s\n", ipdef->tftproot);
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}
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if (ipdef->bootfile) {
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if (VIR_SOCKET_ADDR_VALID(&ipdef->bootserver)) {
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g_autofree char *bootserver = virSocketAddrFormat(&ipdef->bootserver);
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if (!bootserver)
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return -1;
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virBufferAsprintf(buf, "dhcp-boot=%s%s%s\n",
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ipdef->bootfile, ",,", bootserver);
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} else {
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virBufferAsprintf(buf, "dhcp-boot=%s\n", ipdef->bootfile);
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}
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}
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}
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return 0;
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}
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int
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networkDnsmasqConfContents(virNetworkObj *obj,
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const char *pidfile,
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@ -1248,113 +1365,9 @@ networkDnsmasqConfContents(virNetworkObj *obj,
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"on the same network interface.");
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}
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ipdef = ipv4def ? ipv4def : ipv6def;
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while (ipdef) {
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int prefix;
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int r;
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prefix = virNetworkIPDefPrefix(ipdef);
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if (prefix < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("bridge '%s' has an invalid prefix"),
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def->bridge);
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return -1;
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}
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for (r = 0; r < ipdef->nranges; r++) {
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int thisRange;
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virNetworkDHCPRangeDef range = ipdef->ranges[r];
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g_autofree char *leasetime = NULL;
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g_autofree char *saddr = NULL;
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g_autofree char *eaddr = NULL;
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if (!(saddr = virSocketAddrFormat(&range.addr.start)) ||
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!(eaddr = virSocketAddrFormat(&range.addr.end)))
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return -1;
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if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6)) {
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virBufferAsprintf(&configbuf, "dhcp-range=%s,%s,%d",
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saddr, eaddr, prefix);
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} else {
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/* IPv4 - dnsmasq requires a netmask rather than prefix */
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virSocketAddr netmask;
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g_autofree char *netmaskStr = NULL;
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if (virSocketAddrPrefixToNetmask(prefix, &netmask, AF_INET) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Failed to translate bridge '%s' "
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"prefix %d to netmask"),
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def->bridge, prefix);
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return -1;
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}
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if (!(netmaskStr = virSocketAddrFormat(&netmask)))
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return -1;
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virBufferAsprintf(&configbuf, "dhcp-range=%s,%s,%s",
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saddr, eaddr, netmaskStr);
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}
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if ((leasetime = networkBuildDnsmasqLeaseTime(range.lease)))
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virBufferAsprintf(&configbuf, ",%s", leasetime);
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virBufferAddLit(&configbuf, "\n");
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thisRange = virSocketAddrGetRange(&range.addr.start,
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&range.addr.end,
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&ipdef->address,
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virNetworkIPDefPrefix(ipdef));
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if (thisRange < 0)
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return -1;
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nbleases += thisRange;
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}
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/*
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* For static-only DHCP, i.e. with no range but at least one
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* host element, we have to add a special --dhcp-range option
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* to enable the service in dnsmasq. (this is for dhcp-hosts=
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* support)
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*/
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if (!ipdef->nranges && ipdef->nhosts) {
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g_autofree char *bridgeaddr = virSocketAddrFormat(&ipdef->address);
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if (!bridgeaddr)
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return -1;
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virBufferAsprintf(&configbuf, "dhcp-range=%s,static",
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bridgeaddr);
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if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6))
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virBufferAsprintf(&configbuf, ",%d", prefix);
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virBufferAddLit(&configbuf, "\n");
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}
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if (networkBuildDnsmasqDhcpHostsList(dctx, ipdef) < 0)
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return -1;
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/* Note: the following is IPv4 only */
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if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET)) {
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if (ipdef->nranges || ipdef->nhosts) {
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virBufferAddLit(&configbuf, "dhcp-no-override\n");
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virBufferAddLit(&configbuf, "dhcp-authoritative\n");
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}
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if (ipdef->tftproot) {
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virBufferAddLit(&configbuf, "enable-tftp\n");
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virBufferAsprintf(&configbuf, "tftp-root=%s\n", ipdef->tftproot);
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}
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if (ipdef->bootfile) {
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if (VIR_SOCKET_ADDR_VALID(&ipdef->bootserver)) {
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g_autofree char *bootserver = virSocketAddrFormat(&ipdef->bootserver);
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if (!bootserver)
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return -1;
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virBufferAsprintf(&configbuf, "dhcp-boot=%s%s%s\n",
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ipdef->bootfile, ",,", bootserver);
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} else {
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virBufferAsprintf(&configbuf, "dhcp-boot=%s\n", ipdef->bootfile);
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}
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}
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}
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ipdef = (ipdef == ipv6def) ? NULL : ipv6def;
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}
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if (networkDnsmasqConfDHCP(&configbuf, ipv4def, def->bridge, &nbleases, dctx) < 0 ||
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networkDnsmasqConfDHCP(&configbuf, ipv6def, def->bridge, &nbleases, dctx) < 0)
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return -1;
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if (nbleases > 0)
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virBufferAsprintf(&configbuf, "dhcp-lease-max=%d\n", nbleases);
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