xen_common: Split per-Vif logic from xenParseVif()

xenParseVif() does a lot of stuff and, in order to make things cleaner,
let's split it in two new functions:
- xenParseVif(): it's a new function that keeps the old name. It's
responsible for the whole per-Vif logic from the old xenParseVif();
- xenParseVifList(): it's basically the old xenParsePCI(), but now it
just iterates over the list of Vifs, calling xenParsePCI() per each Vif.

This patch is basically preparing the ground for the future when
typesafe virConf acessors will be used.
Signed-off-by: NFabiano Fidêncio <fabiano@fidencio.org>
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NJán Tomko <jtomko@redhat.com>

src/xenconfig/xen_common.c

@@ -846,202 +846,214 @@ xenParseCharDev(virConfPtr conf, virDomainDefPtr def, const char *nativeFormat)
 }
 
 
-static int
-xenParseVif(virConfPtr conf, virDomainDefPtr def, const char *vif_typename)
+static virDomainNetDefPtr
+xenParseVif(char *entry, const char *vif_typename)
 {
-    char *script = NULL;
     virDomainNetDefPtr net = NULL;
-    virConfValuePtr list = virConfGetValue(conf, "vif");
+    virDomainNetDefPtr ret = NULL;
+    char *script = NULL;
+    char model[10];
+    char type[10];
+    char ip[128];
+    char mac[18];
+    char bridge[50];
+    char vifname[50];
+    char rate[50];
+    char *key;
+
+    bridge[0] = '\0';
+    mac[0] = '\0';
+    ip[0] = '\0';
+    model[0] = '\0';
+    type[0] = '\0';
+    vifname[0] = '\0';
+    rate[0] = '\0';
+
+    key = entry;
+    while (key) {
+        char *data;
+        char *nextkey = strchr(key, ',');
+
+        if (!(data = strchr(key, '=')))
+            return NULL;
+        data++;
+
+        if (STRPREFIX(key, "mac=")) {
+            int len = nextkey ? (nextkey - data) : sizeof(mac) - 1;
+            if (virStrncpy(mac, data, len, sizeof(mac)) == NULL) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("MAC address %s too big for destination"),
+                               data);
+                return NULL;
+            }
+        } else if (STRPREFIX(key, "bridge=")) {
+            int len = nextkey ? (nextkey - data) : sizeof(bridge) - 1;
+            if (virStrncpy(bridge, data, len, sizeof(bridge)) == NULL) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Bridge %s too big for destination"),
+                               data);
+                return NULL;
+            }
+        } else if (STRPREFIX(key, "script=")) {
+            int len = nextkey ? (nextkey - data) : strlen(data);
+            VIR_FREE(script);
+            if (VIR_STRNDUP(script, data, len) < 0)
+                return NULL;
+        } else if (STRPREFIX(key, "model=")) {
+            int len = nextkey ? (nextkey - data) : sizeof(model) - 1;
+            if (virStrncpy(model, data, len, sizeof(model)) == NULL) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Model %s too big for destination"),
+                               data);
+                return NULL;
+            }
+        } else if (STRPREFIX(key, "type=")) {
+            int len = nextkey ? (nextkey - data) : sizeof(type) - 1;
+            if (virStrncpy(type, data, len, sizeof(type)) == NULL) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Type %s too big for destination"),
+                               data);
+                return NULL;
+            }
+        } else if (STRPREFIX(key, "vifname=")) {
+            int len = nextkey ? (nextkey - data) : sizeof(vifname) - 1;
+            if (virStrncpy(vifname, data, len, sizeof(vifname)) == NULL) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Vifname %s too big for destination"),
+                               data);
+                return NULL;
+            }
+        } else if (STRPREFIX(key, "ip=")) {
+            int len = nextkey ? (nextkey - data) : sizeof(ip) - 1;
+            if (virStrncpy(ip, data, len, sizeof(ip)) == NULL) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("IP %s too big for destination"), data);
+                return NULL;
+            }
+        } else if (STRPREFIX(key, "rate=")) {
+            int len = nextkey ? (nextkey - data) : sizeof(rate) - 1;
+            if (virStrncpy(rate, data, len, sizeof(rate)) == NULL) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("rate %s too big for destination"), data);
+                return NULL;
+            }
+        }
 
-    if (list && list->type == VIR_CONF_LIST) {
-        list = list->list;
-        while (list) {
-            char model[10];
-            char type[10];
-            char ip[128];
-            char mac[18];
-            char bridge[50];
-            char vifname[50];
-            char rate[50];
-            char *key;
-
-            bridge[0] = '\0';
-            mac[0] = '\0';
-            ip[0] = '\0';
-            model[0] = '\0';
-            type[0] = '\0';
-            vifname[0] = '\0';
-            rate[0] = '\0';
-
-            if ((list->type != VIR_CONF_STRING) || (list->str == NULL))
-                goto skipnic;
-
-            key = list->str;
-            while (key) {
-                char *data;
-                char *nextkey = strchr(key, ',');
+        while (nextkey && (nextkey[0] == ',' ||
+                           nextkey[0] == ' ' ||
+                           nextkey[0] == '\t'))
+            nextkey++;
+        key = nextkey;
+    }
 
-                if (!(data = strchr(key, '=')))
-                    goto skipnic;
-                data++;
-
-                if (STRPREFIX(key, "mac=")) {
-                    int len = nextkey ? (nextkey - data) : sizeof(mac) - 1;
-                    if (virStrncpy(mac, data, len, sizeof(mac)) == NULL) {
-                        virReportError(VIR_ERR_INTERNAL_ERROR,
-                                       _("MAC address %s too big for destination"),
-                                       data);
-                        goto skipnic;
-                    }
-                } else if (STRPREFIX(key, "bridge=")) {
-                    int len = nextkey ? (nextkey - data) : sizeof(bridge) - 1;
-                    if (virStrncpy(bridge, data, len, sizeof(bridge)) == NULL) {
-                        virReportError(VIR_ERR_INTERNAL_ERROR,
-                                       _("Bridge %s too big for destination"),
-                                       data);
-                        goto skipnic;
-                    }
-                } else if (STRPREFIX(key, "script=")) {
-                    int len = nextkey ? (nextkey - data) : strlen(data);
-                    VIR_FREE(script);
-                    if (VIR_STRNDUP(script, data, len) < 0)
-                        goto cleanup;
-                } else if (STRPREFIX(key, "model=")) {
-                    int len = nextkey ? (nextkey - data) : sizeof(model) - 1;
-                    if (virStrncpy(model, data, len, sizeof(model)) == NULL) {
-                        virReportError(VIR_ERR_INTERNAL_ERROR,
-                                       _("Model %s too big for destination"),
-                                       data);
-                        goto skipnic;
-                    }
-                } else if (STRPREFIX(key, "type=")) {
-                    int len = nextkey ? (nextkey - data) : sizeof(type) - 1;
-                    if (virStrncpy(type, data, len, sizeof(type)) == NULL) {
-                        virReportError(VIR_ERR_INTERNAL_ERROR,
-                                       _("Type %s too big for destination"),
-                                       data);
-                        goto skipnic;
-                    }
-                } else if (STRPREFIX(key, "vifname=")) {
-                    int len = nextkey ? (nextkey - data) : sizeof(vifname) - 1;
-                    if (virStrncpy(vifname, data, len, sizeof(vifname)) == NULL) {
-                        virReportError(VIR_ERR_INTERNAL_ERROR,
-                                       _("Vifname %s too big for destination"),
-                                       data);
-                        goto skipnic;
-                    }
-                } else if (STRPREFIX(key, "ip=")) {
-                    int len = nextkey ? (nextkey - data) : sizeof(ip) - 1;
-                    if (virStrncpy(ip, data, len, sizeof(ip)) == NULL) {
-                        virReportError(VIR_ERR_INTERNAL_ERROR,
-                                       _("IP %s too big for destination"), data);
-                        goto skipnic;
-                    }
-                } else if (STRPREFIX(key, "rate=")) {
-                    int len = nextkey ? (nextkey - data) : sizeof(rate) - 1;
-                    if (virStrncpy(rate, data, len, sizeof(rate)) == NULL) {
-                        virReportError(VIR_ERR_INTERNAL_ERROR,
-                                       _("rate %s too big for destination"), data);
-                        goto skipnic;
-                    }
-                }
+    if (VIR_ALLOC(net) < 0)
+        goto cleanup;
 
-                while (nextkey && (nextkey[0] == ',' ||
-                                   nextkey[0] == ' ' ||
-                                   nextkey[0] == '\t'))
-                    nextkey++;
-                key = nextkey;
-            }
+    if (mac[0]) {
+        if (virMacAddrParse(mac, &net->mac) < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("malformed mac address '%s'"), mac);
+            goto cleanup;
+        }
+    }
 
-            if (VIR_ALLOC(net) < 0)
-                goto cleanup;
+    if (bridge[0] || STREQ_NULLABLE(script, "vif-bridge") ||
+        STREQ_NULLABLE(script, "vif-vnic")) {
+        net->type = VIR_DOMAIN_NET_TYPE_BRIDGE;
+    } else {
+        net->type = VIR_DOMAIN_NET_TYPE_ETHERNET;
+    }
 
-            if (mac[0]) {
-                if (virMacAddrParse(mac, &net->mac) < 0) {
-                    virReportError(VIR_ERR_INTERNAL_ERROR,
-                                   _("malformed mac address '%s'"), mac);
-                    goto cleanup;
-                }
-            }
+    if (net->type == VIR_DOMAIN_NET_TYPE_BRIDGE) {
+        if (bridge[0] && VIR_STRDUP(net->data.bridge.brname, bridge) < 0)
+            goto cleanup;
+    }
+    if (ip[0]) {
+        char **ip_list = virStringSplit(ip, " ", 0);
+        size_t i;
 
-            if (bridge[0] || STREQ_NULLABLE(script, "vif-bridge") ||
-                STREQ_NULLABLE(script, "vif-vnic")) {
-                net->type = VIR_DOMAIN_NET_TYPE_BRIDGE;
-            } else {
-                net->type = VIR_DOMAIN_NET_TYPE_ETHERNET;
-            }
+        if (!ip_list)
+            goto cleanup;
 
-            if (net->type == VIR_DOMAIN_NET_TYPE_BRIDGE) {
-                if (bridge[0] && VIR_STRDUP(net->data.bridge.brname, bridge) < 0)
-                    goto cleanup;
+        for (i = 0; ip_list[i]; i++) {
+            if (virDomainNetAppendIPAddress(net, ip_list[i], 0, 0) < 0) {
+                virStringListFree(ip_list);
+                goto cleanup;
             }
-            if (ip[0]) {
-                char **ip_list = virStringSplit(ip, " ", 0);
-                size_t i;
+        }
+        virStringListFree(ip_list);
+    }
 
-                if (!ip_list)
-                    goto cleanup;
+    if (script && script[0] &&
+        VIR_STRDUP(net->script, script) < 0)
+        goto cleanup;
 
-                for (i = 0; ip_list[i]; i++) {
-                    if (virDomainNetAppendIPAddress(net, ip_list[i], 0, 0) < 0) {
-                        virStringListFree(ip_list);
-                        goto cleanup;
-                    }
-                }
-                virStringListFree(ip_list);
-            }
+    if (model[0] &&
+        VIR_STRDUP(net->model, model) < 0)
+        goto cleanup;
 
-            if (script && script[0] &&
-                VIR_STRDUP(net->script, script) < 0)
-                goto cleanup;
+    if (!model[0] && type[0] && STREQ(type, vif_typename) &&
+        VIR_STRDUP(net->model, "netfront") < 0)
+        goto cleanup;
 
-            if (model[0] &&
-                VIR_STRDUP(net->model, model) < 0)
-                goto cleanup;
+    if (vifname[0] &&
+        VIR_STRDUP(net->ifname, vifname) < 0)
+        goto cleanup;
 
-            if (!model[0] && type[0] && STREQ(type, vif_typename) &&
-                VIR_STRDUP(net->model, "netfront") < 0)
-                goto cleanup;
+    if (rate[0]) {
+        virNetDevBandwidthPtr bandwidth;
+        unsigned long long kbytes_per_sec;
 
-            if (vifname[0] &&
-                VIR_STRDUP(net->ifname, vifname) < 0)
-                goto cleanup;
+        if (xenParseSxprVifRate(rate, &kbytes_per_sec) < 0)
+            goto cleanup;
 
-            if (rate[0]) {
-                virNetDevBandwidthPtr bandwidth;
-                unsigned long long kbytes_per_sec;
+        if (VIR_ALLOC(bandwidth) < 0)
+            goto cleanup;
 
-                if (xenParseSxprVifRate(rate, &kbytes_per_sec) < 0)
-                    goto cleanup;
+        if (VIR_ALLOC(bandwidth->out) < 0) {
+            VIR_FREE(bandwidth);
+            goto cleanup;
+        }
 
-                if (VIR_ALLOC(bandwidth) < 0)
-                    goto cleanup;
-                if (VIR_ALLOC(bandwidth->out) < 0) {
-                    VIR_FREE(bandwidth);
-                    goto cleanup;
-                }
+        bandwidth->out->average = kbytes_per_sec;
+        net->bandwidth = bandwidth;
+    }
 
-                bandwidth->out->average = kbytes_per_sec;
-                net->bandwidth = bandwidth;
-            }
+    VIR_STEAL_PTR(ret, net);
 
-            if (VIR_APPEND_ELEMENT(def->nets, def->nnets, net) < 0)
-                goto cleanup;
+ cleanup:
+    virDomainNetDefFree(net);
+    VIR_FREE(script);
+    return ret;
+}
+
+
+static int
+xenParseVifList(virConfPtr conf, virDomainDefPtr def, const char *vif_typename)
+{
+    virConfValuePtr list = virConfGetValue(conf, "vif");
 
-        skipnic:
-            list = list->next;
+    if (!list || list->type != VIR_CONF_LIST)
+        return 0;
+
+    for (list = list->list; list; list = list->next) {
+        virDomainNetDefPtr net = NULL;
+        int rc;
+
+        if ((list->type != VIR_CONF_STRING) || (list->str == NULL))
+            continue;
+
+        if (!(net = xenParseVif(list->str, vif_typename)))
+            return -1;
+
+        rc = VIR_APPEND_ELEMENT(def->nets, def->nnets, net);
+        if (rc < 0) {
             virDomainNetDefFree(net);
-            net = NULL;
-            VIR_FREE(script);
+            return -1;
         }
     }
 
     return 0;
-
- cleanup:
-    virDomainNetDefFree(net);
-    VIR_FREE(script);
-    return -1;
 }
 
 
@@ -1126,10 +1138,10 @@ xenParseConfigCommon(virConfPtr conf,
         return -1;
 
     if (STREQ(nativeFormat, XEN_CONFIG_FORMAT_XL)) {
-        if (xenParseVif(conf, def, "vif") < 0)
+        if (xenParseVifList(conf, def, "vif") < 0)
             return -1;
     } else if (STREQ(nativeFormat, XEN_CONFIG_FORMAT_XM)) {
-        if (xenParseVif(conf, def, "netfront") < 0)
+        if (xenParseVifList(conf, def, "netfront") < 0)
             return -1;
     } else {
         virReportError(VIR_ERR_INVALID_ARG,