Oh crud, did I ever screw the pooch! Rather than sync this with -stable,

I backed-out the changes in -current and didn't touch stable at all (I
thought I had my patch order reversed, not what actually happened).
AIEEE!  I can't even blame the crack for this one since I broke my
crack pipe a few weeks ago.  I think sleep deprivation gets the blame
for this one.

Medal for noticing this one goes to:	Jim Bloom <bloom@acm.org>

1 files changed, 109 insertions, 29 deletions

diff --git a/release/sysinstall/tcpip.c b/release/sysinstall/tcpip.c
index 0393cfe373e2..105ed2c15875 100644
--- a/release/sysinstall/tcpip.c
+++ b/release/sysinstall/tcpip.c
@@ -39,6 +39,7 @@
 
 #include "sysinstall.h"
 #include <sys/param.h>
+#include <netdb.h>
 
 /* The help file for the TCP/IP setup screen */
 #define TCP_HELPFILE		"tcp"
@@ -145,6 +146,53 @@ verifySettings(void)
     return 0;
 }
 
+static void
+dhcpGetInfo(Device *devp)
+{
+    /* If it fails, do it the old-fashioned way */
+    if (dhcpParseLeases("/var/db/dhclient.leases", hostname, domainname,
+			 nameserver, ipaddr, gateway, netmask) == -1) {
+	FILE *ifp;
+	char *cp, cmd[256], data[2048];
+	int i, j;
+
+	/* Bah, now we have to kludge getting the information from ifconfig */
+	snprintf(cmd, sizeof cmd, "ifconfig %s", devp->name);
+	ifp = popen(cmd, "r");
+	if (ifp) {
+	    j = fread(data, 1, sizeof(data), ifp);
+	    fclose(ifp);
+	    if (j < 0)	/* paranoia */
+		j = 0;
+	    data[j] = '\0';
+	    if (isDebug())
+		msgDebug("DHCP configured interface returns %s\n", data);
+	    /* XXX This is gross as it assumes a certain ordering to
+	       ifconfig's output! XXX */
+	    if ((cp = strstr(data, "inet")) != NULL) {
+		i = 0;
+		cp += 5;	/* move over keyword */
+		while (*cp != ' ')
+		    ipaddr[i++] = *(cp++);
+		ipaddr[i] = '\0';
+		if (!strncmp(++cp, "netmask", 7)) {
+		    i = 0;
+		    cp += 8;
+		    while (*cp != ' ')
+			netmask[i++] = *(cp++);
+		    netmask[i] = '\0';
+		}
+	    }
+	}
+    }
+
+    /* If we didn't get a name server value, hunt for it in resolv.conf */
+    if (!nameserver[0] && file_readable("/etc/resolv.conf"))
+	configEnvironmentResolv("/etc/resolv.conf");
+    if (hostname[0])
+	variable_set2(VAR_HOSTNAME, hostname, 0);
+}
+
 /* This is it - how to get TCP setup values */
 int
 tcpOpenDialog(Device *devp)
@@ -153,6 +201,7 @@ tcpOpenDialog(Device *devp)
     ComposeObj          *obj = NULL;
     int                 n = 0, filled = 0, cancel = FALSE;
     int			max, ret = DITEM_SUCCESS;
+    int			use_dhcp = FALSE;
     char                *tmp;
     char		title[80];
 
@@ -163,22 +212,46 @@ tcpOpenDialog(Device *devp)
 	SAFE_STRCPY(ipaddr, di->ipaddr);
 	SAFE_STRCPY(netmask, di->netmask);
 	SAFE_STRCPY(extras, di->extras);
+	use_dhcp = di->use_dhcp;
     }
     else { /* See if there are any defaults */
 	char *cp;
 
+	/* First try a DHCP scan if such behavior is desired */
+	if (!variable_cmp(VAR_TRY_DHCP, "YES") || !msgYesNo("Do you want to try DHCP configuration of the interface?")) {
+	    int k;
+
+	    Mkdir("/var/db");
+	    Mkdir("/var/run");
+	    Mkdir("/tmp");
+	    msgNotify("Scanning for DHCP servers...");
+	    for (k = 1; k < 4; k++) {
+		if (0 == vsystem("dhclient -1 %s", devp->name)) {
+		    dhcpGetInfo(devp);
+		    use_dhcp = TRUE;
+		    break;
+		}
+		msgNotify("Scanning for DHCP servers...  Retry: %d", k);
+	    }
+	}
+
+	/* Get old IP address from variable space, if available */
 	if (!ipaddr[0]) {
 	    if ((cp = variable_get(VAR_IPADDR)) != NULL)
 		SAFE_STRCPY(ipaddr, cp);
 	    else if ((cp = variable_get(string_concat3(devp->name, "_", VAR_IPADDR))) != NULL)
 		SAFE_STRCPY(ipaddr, cp);
 	}
+
+	/* Get old netmask from variable space, if available */
 	if (!netmask[0]) {
 	    if ((cp = variable_get(VAR_NETMASK)) != NULL)
 		SAFE_STRCPY(netmask, cp);
 	    else if ((cp = variable_get(string_concat3(devp->name, "_", VAR_NETMASK))) != NULL)
 		SAFE_STRCPY(netmask, cp);
 	}
+
+	/* Get old extras string from variable space, if available */
 	if (!extras[0]) {
 	    if ((cp = variable_get(VAR_EXTRAS)) != NULL)
 		SAFE_STRCPY(extras, cp);
@@ -188,26 +261,26 @@ tcpOpenDialog(Device *devp)
     }
 
     /* Look up values already recorded with the system, or blank the string variables ready to accept some new data */
-    tmp = variable_get(VAR_HOSTNAME);
-    if (tmp)
-	SAFE_STRCPY(hostname, tmp);
-    else
-	bzero(hostname, sizeof(hostname));
-    tmp = variable_get(VAR_DOMAINNAME);
-    if (tmp)
-	SAFE_STRCPY(domainname, tmp);
-    else
-	bzero(domainname, sizeof(domainname));
-    tmp = variable_get(VAR_GATEWAY);
-    if (tmp)
-	SAFE_STRCPY(gateway, tmp);
-    else
-	bzero(gateway, sizeof(gateway));
-    tmp = variable_get(VAR_NAMESERVER);
-    if (tmp)
-	SAFE_STRCPY(nameserver, tmp);
-    else
-	bzero(nameserver, sizeof(nameserver));
+    if (!hostname[0]) {
+	tmp = variable_get(VAR_HOSTNAME);
+	if (tmp)
+	    SAFE_STRCPY(hostname, tmp);
+    }
+    if (!domainname[0]) {
+	tmp = variable_get(VAR_DOMAINNAME);
+	if (tmp)
+	    SAFE_STRCPY(domainname, tmp);
+    }
+    if (!gateway[0]) {
+	tmp = variable_get(VAR_GATEWAY);
+	if (tmp)
+	    SAFE_STRCPY(gateway, tmp);
+    }
+    if (!nameserver[0]) {
+	tmp = variable_get(VAR_NAMESERVER);
+	if (tmp)
+	    SAFE_STRCPY(nameserver, tmp);
+    }
 
     save = savescr();
     /* If non-interactive, jump straight over the dialog crap and into config section */
@@ -252,7 +325,7 @@ reenter:
 	     * the most appropriate one (entire class C, or subnetted
 	     * class A/B network).
 	     */
-	    if (netmask[0] == '\0') {
+	    if (!netmask[0]) {
 		strcpy(netmask, "255.255.255.0");
 		RefreshStringObj(layout[LAYOUT_NETMASK].obj);
 		++filled;
@@ -288,14 +361,18 @@ netconfig:
 	char temp[512], ifn[255];
 	char *ifaces;
 
-	variable_set2(VAR_HOSTNAME, hostname, 1);
-	sethostname(hostname, strlen(hostname));
+	if (hostname[0]) {
+	    variable_set2(VAR_HOSTNAME, hostname, use_dhcp ? 0 : 1);
+	    sethostname(hostname, strlen(hostname));
+	}
 	if (domainname[0])
 	    variable_set2(VAR_DOMAINNAME, domainname, 0);
 	if (gateway[0])
-	    variable_set2(VAR_GATEWAY, gateway, 1);
+	    variable_set2(VAR_GATEWAY, gateway, use_dhcp ? 0 : 1);
 	if (nameserver[0])
 	    variable_set2(VAR_NAMESERVER, nameserver, 0);
+	if (ipaddr[0])
+	    variable_set2(VAR_IPADDR, ipaddr, 0);
 
 	if (!devp->private)
 	    devp->private = (DevInfo *)safe_malloc(sizeof(DevInfo));
@@ -303,9 +380,13 @@ netconfig:
 	SAFE_STRCPY(di->ipaddr, ipaddr);
 	SAFE_STRCPY(di->netmask, netmask);
 	SAFE_STRCPY(di->extras, extras);
+	di->use_dhcp = use_dhcp;
 
-	sprintf(temp, "inet %s %s netmask %s", ipaddr, extras, netmask);
 	sprintf(ifn, "%s%s", VAR_IFCONFIG, devp->name);
+	if (use_dhcp)
+	    sprintf(temp, "DHCP");
+	else
+	    sprintf(temp, "inet %s %s netmask %s", ipaddr, extras, netmask);
 	variable_set2(ifn, temp, 1);
 	ifaces = variable_get(VAR_INTERFACES);
 	if (!ifaces)
@@ -315,9 +396,8 @@ netconfig:
 	    sprintf(ifn, "%s %s", devp->name, ifaces);
 	    variable_set2(VAR_INTERFACES, ifn, 1);
 	}
-	if (ipaddr[0])
-	    variable_set2(VAR_IPADDR, ipaddr, 0);
-	configResolv(NULL);	/* XXX this will do it on the MFS copy XXX */
+	if (!use_dhcp)
+	    configResolv(NULL);	/* XXX this will do it on the MFS copy XXX */
 	ret = DITEM_SUCCESS;
     }
     else
@@ -396,7 +476,7 @@ tcpMenuSelect(dialogMenuItem *self)
     Device *tmp;
 
     tmp = tcpDeviceSelect();
-    if (tmp && !msgYesNo("Would you like to bring the %s interface up right now?", tmp->name))
+    if (tmp && !((DevInfo *)tmp->private)->use_dhcp && !msgYesNo("Would you like to bring the %s interface up right now?", tmp->name))
 	if (!tmp->init(tmp))
 	    msgConfirm("Initialization of %s device failed.", tmp->name);
     return DITEM_SUCCESS | DITEM_RESTORE;