X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fstropts.c;h=627031215a9c286ab76c0ff245722ea5f8105bd8;hp=95392a1f6eb67de47fe2a76c3825fb14d32d3412;hb=ba0c5b3b8a635ce671778b630787bce857ee81c7;hpb=798d0f1244ad4b77f1862c670ada16780c26a7af

diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c
index 95392a1..6270312 100644
--- a/utils/mount/stropts.c
+++ b/utils/mount/stropts.c
@@ -37,8 +37,10 @@
 #include "nls.h"
 #include "nfs_mount.h"
 #include "mount_constants.h"
+#include "stropts.h"
 #include "error.h"
 #include "network.h"
+#include "parse_opt.h"
 
 #ifdef HAVE_RPCSVC_NFS_PROT_H
 #include <rpcsvc/nfs_prot.h>
@@ -51,35 +53,67 @@
 #define NFS_PORT 2049
 #endif
 
+#ifndef NFS_MAXHOSTNAME
+#define NFS_MAXHOSTNAME		(255)
+#endif
+
+#ifndef NFS_MAXPATHNAME
+#define NFS_MAXPATHNAME		(1024)
+#endif
+
 extern int nfs_mount_data_version;
 extern char *progname;
 extern int verbose;
 
-static int retry_opt = 10000;		/* 10,000 minutes ~= 1 week */
-static int bg_opt = 0;
-static int addr_opt = 0;
-static int ca_opt = 0;
-
-static int parse_devname(char *hostdir, char **hostname, char **dirname)
+static int parse_devname(const char *spec, char **hostname)
 {
-	char *s;
+	int ret = 0;
+	char *dev, *pathname, *s;
+
+	dev = xstrdup(spec);
 
-	if (!(s = strchr(hostdir, ':'))) {
-		nfs_error(_("%s: directory to mount not in host:dir format"),
+	if (!(pathname = strchr(dev, ':'))) {
+		nfs_error(_("%s: remote share not in 'host:dir' format"),
+				progname);
+		goto out;
+	}
+	*pathname = '\0';
+	pathname++;
+
+	/*
+	 * We don't need a copy of the pathname, but let's
+	 * sanity check it anyway.
+	 */
+	if (strlen(pathname) > NFS_MAXPATHNAME) {
+		nfs_error(_("%s: export pathname is too long"),
 				progname);
-		return -1;
+		goto out;
 	}
-	*hostname = hostdir;
-	*dirname = s + 1;
-	*s = '\0';
-	/* Ignore all but first hostname in replicated mounts
-	   until they can be fully supported. (mack@sgi.com) */
-	if ((s = strchr(hostdir, ','))) {
+
+	/*
+	 * Ignore all but first hostname in replicated mounts
+	 * until they can be fully supported. (mack@sgi.com)
+	 */
+	if ((s = strchr(dev, ','))) {
 		*s = '\0';
 		nfs_error(_("%s: warning: multiple hostnames not supported"),
 				progname);
+		nfs_error(_("%s: ignoring hostnames that follow the first one"),
+				progname);
 	}
-	return 0;
+	*hostname = xstrdup(dev);
+	if (strlen(*hostname) > NFS_MAXHOSTNAME) {
+		nfs_error(_("%s: server hostname is too long"),
+				progname);
+		free(*hostname);
+		goto out;
+	}
+
+	ret = 1;
+
+out:
+	free(dev);
+	return ret;
 }
 
 static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
@@ -103,136 +137,103 @@ static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
 }
 
 /*
- * XXX: This should really use the technique neil recently added
- * to get the address off the local end of a socket connected to
- * the server -- to get the right address to use on multi-homed
- * clients
+ * Append the 'addr=' option to the options string to pass a resolved
+ * server address to the kernel.  After a successful mount, this address
+ * is also added to /etc/mtab for use when unmounting.
+ *
+ * If 'addr=' is already present, we strip it out.  This prevents users
+ * from setting a bogus 'addr=' option themselves, and also allows bg
+ * retries to recompute the server's address, in case it has changed.
+ *
+ * Returns 1 if 'addr=' option appended successfully;
+ * otherwise zero.
  */
-static int get_my_ipv4addr(char *ip_addr, int len)
+static int append_addr_option(struct sockaddr_in *saddr,
+			   struct mount_options *options)
 {
-	char myname[1024];
-	struct sockaddr_in myaddr;
+	char new_option[24];
 
-	if (gethostname(myname, sizeof(myname))) {
-		nfs_error(_("%s: can't determine client address\n"),
-				progname);
-		return 0;
-	}
-	if (!fill_ipv4_sockaddr(myname, &myaddr))
-		return 0;
+	po_remove_all(options, "addr");
 
-	snprintf(ip_addr, len, "%s", inet_ntoa(myaddr.sin_addr));
-	ip_addr[len - 1] = '\0';
+	snprintf(new_option, sizeof(new_option) - 1,
+			"addr=%s", inet_ntoa(saddr->sin_addr));
 
-	return 1;
+	if (po_append(options, new_option) == PO_SUCCEEDED)
+		return 1;
+	return 0;
 }
 
 /*
- * Walk through our mount options string, and indicate the presence
- * of 'bg', 'retry=', and 'clientaddr='.
+ * Called to discover our address and append an appropriate 'clientaddr='
+ * option to the options string.
+ *
+ * Returns 1 if 'clientaddr=' option created successfully or if
+ * 'clientaddr=' option is already present; otherwise zero.
  */
-static void extract_interesting_options(char *opts)
+static int append_clientaddr_option(struct sockaddr_in *saddr,
+				    struct mount_options *options)
 {
-	char *opt, *opteq;
-	int val;
-
-	opts = xstrdup(opts);
-
-	for (opt = strtok(opts, ","); opt; opt = strtok(NULL, ",")) {
-		if ((opteq = strchr(opt, '='))) {
-			val = atoi(opteq + 1);
-			*opteq = '\0';
-			if (strcmp(opt, "bg") == 0)
-				bg_opt++;
-			else if (strcmp(opt, "retry") == 0)
-				retry_opt = val;
-			else if (strcmp(opt, "addr") == 0)
-				addr_opt++;
-			else if (strcmp(opt, "clientaddr") == 0)
-				ca_opt++;
-		} else {
-			if (strcmp(opt, "bg") == 0)
-				bg_opt++;
-		}
-	}
+	struct sockaddr_in my_addr;
+	char new_option[32];
+
+	if (po_contains(options, "clientaddr") == PO_SUCCEEDED)
+		return 1;
+
+	if (!get_client_address(saddr, &my_addr))
+		return 0;
 
-	free(opts);
+	snprintf(new_option, sizeof(new_option) - 1,
+			"clientaddr=%s", inet_ntoa(my_addr.sin_addr));
+
+	if (po_append(options, new_option) == PO_SUCCEEDED)
+		return 1;
+	return 0;
 }
 
 /*
- * Append the "addr=" option to the options string.
- *
- * We always add our own addr= to the end of the options string.
+ * Resolve the 'mounthost=' hostname and append a new option using
+ * the resulting IPv4 address.
  */
-static int append_addr_opt(const char *spec, char **extra_opts)
+static int fix_mounthost_option(struct mount_options *options)
 {
-	static char hostdir[1024], new_opts[1024], ip_addr[255];
-	char *hostname, *dirname, *s, *old_opts;
-	struct sockaddr_in addr;
+	struct sockaddr_in maddr;
+	char *mounthost, new_option[32];
 
-	if (strlen(spec) >= sizeof(hostdir)) {
-		nfs_error(_("%s: excessively long host:dir argument\n"),
-				progname);
-		return 0;
-	}
-	strcpy(hostdir, spec);
-	if (parse_devname(hostdir, &hostname, &dirname)) {
-		nfs_error(_("%s: parsing host:dir argument failed\n"),
-				progname);
-		return 0;
-	}
+	mounthost = po_get(options, "mounthost");
+	if (!mounthost)
+		return 1;
 
-	if (!fill_ipv4_sockaddr(hostname, &addr))
-		return 0;
-	if (!get_my_ipv4addr(ip_addr, sizeof(ip_addr)))
+	if (!fill_ipv4_sockaddr(mounthost, &maddr))
 		return 0;
 
-	/* add IP address to mtab options for use when unmounting */
-	s = inet_ntoa(addr.sin_addr);
-	old_opts = *extra_opts;
-	if (!old_opts)
-		old_opts = "";
-	if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
-		nfs_error(_("%s: excessively long option argument\n"),
-				progname);
-		return 0;
-	}
-	snprintf(new_opts, sizeof(new_opts), "%s%saddr=%s",
-		 old_opts, *old_opts ? "," : "", s);
-	*extra_opts = xstrdup(new_opts);
+	snprintf(new_option, sizeof(new_option) - 1,
+			"mountaddr=%s", inet_ntoa(maddr.sin_addr));
 
-	return 1;
+	if (po_append(options, new_option) == PO_SUCCEEDED)
+		return 1;
+	return 0;
 }
 
 /*
- * Append the "clientaddr=" option to the options string.
+ * Set up mandatory mount options.
  *
- * Returns 1 if clientaddr option created successfully;
- * otherwise zero.
+ * Returns 1 if successful; otherwise zero.
  */
-static int append_clientaddr_opt(const char *spec, char **extra_opts)
+static int set_mandatory_options(const char *type,
+				 struct sockaddr_in *saddr,
+				 struct mount_options *options)
 {
-	static char new_opts[1024], cbuf[1024];
-	static char ip_addr[16] = "127.0.0.1";
-
-	if (!get_my_ipv4addr(ip_addr, sizeof(ip_addr)))
+	if (!append_addr_option(saddr, options))
 		return 0;
 
-	/* Ensure we have enough padding for the following strcat()s */
-	if (strlen(*extra_opts) + strlen(ip_addr) + 10 >= sizeof(new_opts)) {
-		nfs_error(_("%s: excessively long option argument"),
-				progname);
-		return 0;
+	if (strncmp(type, "nfs4", 4) == 0) {
+		if (!append_clientaddr_option(saddr, options))
+			return 0;
+	} else {
+		if (!fix_mounthost_option(options))
+			return 0;
 	}
 
-	strcat(new_opts, *extra_opts);
-
-	snprintf(cbuf, sizeof(cbuf) - 1, "%sclientaddr=%s",
-			*extra_opts ? "," : "", ip_addr);
-	strcat(new_opts, cbuf);
-
-	*extra_opts = xstrdup(new_opts);
-
 	return 1;
 }
 
@@ -245,19 +246,41 @@ static int append_clientaddr_opt(const char *spec, char **extra_opts)
  * @extra_opts:	pointer to C string containing fs-specific mount options
  *		(possibly also a return argument)
  * @fake:	flag indicating whether to carry out the whole operation
- * @bg:		one if this is a backgrounded mount attempt
+ * @child:	one if this is a backgrounded mount
  *
  * XXX: need to handle bg, fg, and retry options.
  */
 int nfsmount_s(const char *spec, const char *node, int flags,
-		char **extra_opts, int fake, int bg)
+		char **extra_opts, int fake, int child)
 {
-	int retval = EX_FAIL;
+	struct mount_options *options = NULL;
+	struct sockaddr_in saddr;
+	char *hostname;
+	int err, retval = EX_FAIL;
+
+	if (!parse_devname(spec, &hostname))
+		goto out;
+	err = fill_ipv4_sockaddr(hostname, &saddr);
+	free(hostname);
+	if (!err)
+		goto out;
+
+	options = po_split(*extra_opts);
+	if (!options) {
+		nfs_error(_("%s: internal option parsing error"), progname);
+		goto out;
+	}
 
-	extract_interesting_options(*extra_opts);
+	if (!append_addr_option(&saddr, options))
+		goto out;
 
-	if (!addr_opt && !append_addr_opt(spec, extra_opts))
-		goto fail;
+	if (!fix_mounthost_option(options))
+		goto out;
+
+	if (po_join(options, extra_opts) == PO_FAILED) {
+		nfs_error(_("%s: internal option parsing error"), progname);
+		goto out;
+	}
 
 	if (verbose)
 		printf(_("%s: text-based options: '%s'\n"),
@@ -267,13 +290,14 @@ int nfsmount_s(const char *spec, const char *node, int flags,
 		if (mount(spec, node, "nfs",
 				flags & ~(MS_USER|MS_USERS), *extra_opts)) {
 			mount_error(spec, node, errno);
-			goto fail;
+			goto out;
 		}
 	}
 
-	return 0;
+	retval = EX_SUCCESS;
 
-fail:
+out:
+	po_destroy(options);
 	return retval;
 }
 
@@ -286,23 +310,42 @@ fail:
  * @extra_opts:	pointer to C string containing fs-specific mount options
  *		(possibly also a return argument)
  * @fake:	flag indicating whether to carry out the whole operation
- * @bg:		one if this is a backgrounded mount attempt
+ * @child:	one if this is a backgrounded mount
  *
  * XXX: need to handle bg, fg, and retry options.
  *
  */
 int nfs4mount_s(const char *spec, const char *node, int flags,
-		char **extra_opts, int fake)
+		char **extra_opts, int fake, int child)
 {
-	int retval = EX_FAIL;
+	struct mount_options *options = NULL;
+	struct sockaddr_in saddr;
+	char *hostname;
+	int err, retval = EX_FAIL;
+
+	if (!parse_devname(spec, &hostname))
+		goto out;
+	err = fill_ipv4_sockaddr(hostname, &saddr);
+	free(hostname);
+	if (!err)
+		goto out;
+
+	options = po_split(*extra_opts);
+	if (!options) {
+		nfs_error(_("%s: internal option parsing error"), progname);
+		goto out;
+	}
 
-	extract_interesting_options(*extra_opts);
+	if (!append_addr_option(&saddr, options))
+		goto out;
 
-	if (!addr_opt && !append_addr_opt(spec, extra_opts))
-		goto fail;
+	if (!append_clientaddr_option(&saddr, options))
+		goto out;
 
-	if (!ca_opt && !append_clientaddr_opt(spec, extra_opts))
-		goto fail;
+	if (po_join(options, extra_opts) == PO_FAILED) {
+		nfs_error(_("%s: internal option parsing error"), progname);
+		goto out;
+	}
 
 	if (verbose)
 		printf(_("%s: text-based options: '%s'\n"),
@@ -312,12 +355,13 @@ int nfs4mount_s(const char *spec, const char *node, int flags,
 		if (mount(spec, node, "nfs4",
 				flags & ~(MS_USER|MS_USERS), *extra_opts)) {
 			mount_error(spec, node, errno);
-			goto fail;
+			goto out;
 		}
 	}
 
-	return 0;
+	retval = EX_SUCCESS;
 
-fail:
+out:
+	po_destroy(options);
 	return retval;
 }