slirp: Move smb, redir, tftp and bootp parameters and -net channel

So far a couple of slirp-related parameters were expressed via
stand-alone command line options. This it inconsistent and unintuitive.
Moreover, it prevents both dynamically reconfigured (host_net_add/
delete) and multi-instance slirp.

This patch refactors the configuration by turning -smb, -redir, -tftp
and -bootp as well as -net channel into options of "-net user". The old
stand-alone command line options are still processed, but no longer
advertised. This allows smooth migration of management applications to
to the new syntax and also the extension of that syntax later in this
series.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 129 insertions, 46 deletions

diff --git a/net.c b/net.c
index 21cf574d208..18c51190bf5 100644
--- a/net.c
+++ b/net.c
@@ -669,22 +669,28 @@ static void config_error(Monitor *mon, const char *fmt, ...)
 
 /* slirp network adapter */
 
+#define SLIRP_CFG_REDIR 1
+
 struct slirp_config_str {
     struct slirp_config_str *next;
-    const char *str;
+    int flags;
+    char str[1024];
 };
 
 static int slirp_inited;
-static struct slirp_config_str *slirp_redirs;
-#ifndef _WIN32
-static const char *slirp_smb_export;
-#endif
+static struct slirp_config_str *slirp_configs;
+const char *legacy_tftp_prefix;
+const char *legacy_bootp_filename;
 static VLANClientState *slirp_vc;
 
+static void slirp_redirection(Monitor *mon, const char *redir_str);
+static void vmchannel_init(Monitor *mon, const char *config_str);
+
 #ifndef _WIN32
+static const char *legacy_smb_export;
+
 static void slirp_smb(const char *exported_dir);
 #endif
-static void slirp_redirection(Monitor *mon, const char *redir_str);
 
 int slirp_can_output(void)
 {
@@ -724,27 +730,42 @@ static void net_slirp_cleanup(VLANClientState *vc)
     slirp_in_use = 0;
 }
 
-static int net_slirp_init(VLANState *vlan, const char *model, const char *name,
-                          int restricted, const char *ip)
+static int net_slirp_init(Monitor *mon, VLANState *vlan, const char *model,
+                          const char *name, int restricted, const char *ip,
+                          const char *tftp_export, const char *bootfile,
+                          const char *smb_export)
 {
     if (slirp_in_use) {
         /* slirp only supports a single instance so far */
         return -1;
     }
     if (!slirp_inited) {
+        if (!tftp_export) {
+            tftp_export = legacy_tftp_prefix;
+        }
+        if (!bootfile) {
+            bootfile = legacy_bootp_filename;
+        }
         slirp_inited = 1;
-        slirp_init(restricted, ip);
+        slirp_init(restricted, ip, tftp_export, bootfile);
 
-        while (slirp_redirs) {
-            struct slirp_config_str *config = slirp_redirs;
+        while (slirp_configs) {
+            struct slirp_config_str *config = slirp_configs;
 
-            slirp_redirection(NULL, config->str);
-            slirp_redirs = config->next;
+            if (config->flags & SLIRP_CFG_REDIR) {
+                slirp_redirection(mon, config->str);
+            } else {
+                vmchannel_init(mon, config->str);
+            }
+            slirp_configs = config->next;
             qemu_free(config);
         }
 #ifndef _WIN32
-        if (slirp_smb_export) {
-            slirp_smb(slirp_smb_export);
+        if (!smb_export) {
+            smb_export = legacy_smb_export;
+        }
+        if (smb_export) {
+            slirp_smb(smb_export);
         }
 #endif
     }
@@ -853,9 +874,10 @@ void net_slirp_redir(Monitor *mon, const char *redir_str, const char *redir_opt2
             monitor_printf(mon, "user mode network stack not in use\n");
         } else {
             config = qemu_malloc(sizeof(*config));
-            config->str = redir_str;
-            config->next = slirp_redirs;
-            slirp_redirs = config;
+            pstrcpy(config->str, sizeof(config->str), redir_str);
+            config->flags = SLIRP_CFG_REDIR;
+            config->next = slirp_configs;
+            slirp_configs = config;
         }
         return;
     }
@@ -952,14 +974,14 @@ static void slirp_smb(const char *exported_dir)
     slirp_add_exec(0, smb_cmdline, 4, 139);
 }
 
-/* automatic user mode samba server configuration */
+/* automatic user mode samba server configuration (legacy interface) */
 void net_slirp_smb(const char *exported_dir)
 {
-    if (slirp_smb_export) {
+    if (legacy_smb_export) {
         fprintf(stderr, "-smb given twice\n");
         exit(1);
     }
-    slirp_smb_export = exported_dir;
+    legacy_smb_export = exported_dir;
     if (slirp_inited) {
         slirp_smb(exported_dir);
     }
@@ -989,6 +1011,36 @@ static void vmchannel_read(void *opaque, const uint8_t *buf, int size)
     slirp_socket_recv(4, vmc->port, buf, size);
 }
 
+static void vmchannel_init(Monitor *mon, const char *config_str)
+{
+    struct VMChannel *vmc;
+    char *devname;
+    char name[20];
+    int port;
+
+    port = strtol(config_str, &devname, 10);
+    if (port < 1 || port > 65535 || *devname != ':') {
+        config_error(mon, "invalid vmchannel port number\n");
+        return;
+    }
+    devname++;
+
+    vmc = qemu_malloc(sizeof(struct VMChannel));
+    snprintf(name, sizeof(name), "vmchannel%d", port);
+    vmc->hd = qemu_chr_open(name, devname, NULL);
+    if (!vmc->hd) {
+        config_error(mon, "could not open vmchannel device '%s'\n", devname);
+        qemu_free(vmc);
+        return;
+    }
+    vmc->port = port;
+
+    slirp_add_exec(3, vmc->hd, 4, port);
+    qemu_chr_add_handlers(vmc->hd, vmchannel_can_read, vmchannel_read,
+                          NULL, vmc);
+    return;
+}
+
 #endif /* CONFIG_SLIRP */
 
 #if !defined(_WIN32)
@@ -2200,10 +2252,16 @@ int net_client_init(Monitor *mon, const char *device, const char *p)
 #ifdef CONFIG_SLIRP
     if (!strcmp(device, "user")) {
         static const char * const slirp_params[] = {
-            "vlan", "name", "hostname", "restrict", "ip", NULL
+            "vlan", "name", "hostname", "restrict", "ip", "tftp", "bootfile",
+            "smb", "redir", "channel", NULL
         };
+        struct slirp_config_str *config;
+        char *tftp_export = NULL;
+        char *bootfile = NULL;
+        char *smb_export = NULL;
         int restricted = 0;
         char *ip = NULL;
+        const char *q;
 
         if (check_params(buf, sizeof(buf), slirp_params, p) < 0) {
             config_error(mon, "invalid parameter '%s' in '%s'\n", buf, p);
@@ -2219,34 +2277,59 @@ int net_client_init(Monitor *mon, const char *device, const char *p)
         if (get_param_value(buf, sizeof(buf), "ip", p)) {
             ip = qemu_strdup(buf);
         }
+        if (get_param_value(buf, sizeof(buf), "tftp", p)) {
+            tftp_export = qemu_strdup(buf);
+        }
+        if (get_param_value(buf, sizeof(buf), "bootfile", p)) {
+            bootfile = qemu_strdup(buf);
+        }
+        if (get_param_value(buf, sizeof(buf), "smb", p)) {
+            smb_export = qemu_strdup(buf);
+        }
+        q = p;
+        while (1) {
+            config = qemu_malloc(sizeof(*config));
+            if (!get_next_param_value(config->str, sizeof(config->str),
+                                      "redir", &q)) {
+                break;
+            }
+            config->flags = SLIRP_CFG_REDIR;
+            config->next = slirp_configs;
+            slirp_configs = config;
+            config = NULL;
+        }
+        q = p;
+        while (1) {
+            config = qemu_malloc(sizeof(*config));
+            if (!get_next_param_value(config->str, sizeof(config->str),
+                                      "channel", &q)) {
+                break;
+            }
+            config->flags = 0;
+            config->next = slirp_configs;
+            slirp_configs = config;
+            config = NULL;
+        }
+        qemu_free(config);
         vlan->nb_host_devs++;
-        ret = net_slirp_init(vlan, device, name, restricted, ip);
+        ret = net_slirp_init(mon, vlan, device, name, restricted, ip,
+                             tftp_export, bootfile, smb_export);
         qemu_free(ip);
+        qemu_free(tftp_export);
+        qemu_free(bootfile);
+        qemu_free(smb_export);
     } else if (!strcmp(device, "channel")) {
-        long port;
-        char name[20], *devname;
-        struct VMChannel *vmc;
-
-        port = strtol(p, &devname, 10);
-        devname++;
-        if (port < 1 || port > 65535) {
-            config_error(mon, "vmchannel wrong port number\n");
-            ret = -1;
-            goto out;
-        }
-        vmc = malloc(sizeof(struct VMChannel));
-        snprintf(name, 20, "vmchannel%ld", port);
-        vmc->hd = qemu_chr_open(name, devname, NULL);
-        if (!vmc->hd) {
-            config_error(mon, "could not open vmchannel device '%s'\n",
-                         devname);
-            ret = -1;
-            goto out;
+        if (!slirp_inited) {
+            struct slirp_config_str *config;
+
+            config = qemu_malloc(sizeof(*config));
+            pstrcpy(config->str, sizeof(config->str), p);
+            config->flags = 0;
+            config->next = slirp_configs;
+            slirp_configs = config;
+        } else {
+            vmchannel_init(mon, p);
         }
-        vmc->port = port;
-        slirp_add_exec(3, vmc->hd, 4, port);
-        qemu_chr_add_handlers(vmc->hd, vmchannel_can_read, vmchannel_read,
-                NULL, vmc);
         ret = 0;
     } else
 #endif