X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fstropts.c;h=72480b7e0d279429b870d5b0a3db2107b95081cf;hp=e3a3ac941d322c55950f7347a0b3f26154d71941;hb=8c562efffb0e4e4e084f9605d0b9e1468b642eb4;hpb=8034455d1fc4e315b54d100fd8138ce4c5c08471 diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c index e3a3ac9..72480b7 100644 --- a/utils/mount/stropts.c +++ b/utils/mount/stropts.c @@ -191,82 +191,403 @@ static int append_clientaddr_option(struct sockaddr_in *saddr, } /* - * nfsmount_s - Mount an NFSv2 or v3 file system using C string options + * Resolve the 'mounthost=' hostname and append a new option using + * the resulting IPv4 address. + */ +static int fix_mounthost_option(struct mount_options *options) +{ + struct sockaddr_in maddr; + char *mounthost, new_option[32]; + + mounthost = po_get(options, "mounthost"); + if (!mounthost) + return 1; + + if (!fill_ipv4_sockaddr(mounthost, &maddr)) + return 0; + + snprintf(new_option, sizeof(new_option) - 1, + "mountaddr=%s", inet_ntoa(maddr.sin_addr)); + + if (po_append(options, new_option) == PO_SUCCEEDED) + return 1; + return 0; +} + +/* + * Set up mandatory mount options. * - * @spec: C string hostname:path specifying remoteshare to mount - * @node: C string pathname of local mounted on directory - * @flags: MS_ style flags - * @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 - * @child: one if this is a backgrounded mount + * Returns 1 if successful; otherwise zero. + */ +static int set_mandatory_options(const char *type, + struct sockaddr_in *saddr, + struct mount_options *options) +{ + if (!append_addr_option(saddr, options)) + return 0; + + if (strncmp(type, "nfs4", 4) == 0) { + if (!append_clientaddr_option(saddr, options)) + return 0; + } else { + if (!fix_mounthost_option(options)) + return 0; + } + + return 1; +} + +/* + * Distinguish between permanent and temporary errors. * - * XXX: need to handle bg, fg, and retry options. + * Returns 0 if the passed-in error is temporary, thus the + * mount system call should be retried; returns one if the + * passed-in error is permanent, thus the mount system call + * should not be retried. */ -int nfsmount_s(const char *spec, const char *node, int flags, - char **extra_opts, int fake, int child) +static int is_permanent_error(int error) { - struct mount_options *options = NULL; - struct sockaddr_in saddr; - char *hostname; - int err, retval = EX_FAIL; + switch (error) { + case EACCES: + case ESTALE: + case ETIMEDOUT: + case ECONNREFUSED: + return 0; /* temporary */ + default: + return 1; /* permanent */ + } +} - if (!parse_devname(spec, &hostname)) - goto out; - err = fill_ipv4_sockaddr(hostname, &saddr); - free(hostname); - if (!err) - goto out; +/* + * Reconstruct the mount option string based on a portmapper probe + * of the server. Returns one if the server's portmapper returned + * something we can use, otherwise zero. + * + * To handle version and transport protocol fallback properly, we + * need to parse some of the mount options in order to set up a + * portmap probe. Mount options that rewrite_mount_options() + * doesn't recognize are left alone. + * + * Returns a new group of mount options if successful; otherwise + * NULL is returned if some failure occurred. + */ +static struct mount_options *rewrite_mount_options(char *str) +{ + struct mount_options *options; + char *option, new_option[64]; + clnt_addr_t mnt_server = { }; + clnt_addr_t nfs_server = { }; + int p; + + options = po_split(str); + if (!options) + return NULL; + + option = po_get(options, "addr"); + if (option) { + nfs_server.saddr.sin_family = AF_INET; + if (!inet_aton((const char *)option, &nfs_server.saddr.sin_addr)) + goto err; + } else + goto err; + + option = po_get(options, "mountaddr"); + if (option) { + mnt_server.saddr.sin_family = AF_INET; + if (!inet_aton((const char *)option, &mnt_server.saddr.sin_addr)) + goto err; + } else + memcpy(&mnt_server.saddr, &nfs_server.saddr, + sizeof(mnt_server.saddr)); + + option = po_get(options, "mountport"); + if (option) + mnt_server.pmap.pm_port = atoi(option); + mnt_server.pmap.pm_prog = MOUNTPROG; + option = po_get(options, "mountprog"); + if (option) + mnt_server.pmap.pm_prog = atoi(option); + option = po_get(options, "mountvers"); + if (option) + mnt_server.pmap.pm_vers = atoi(option); + + option = po_get(options, "port"); + if (option) { + nfs_server.pmap.pm_port = atoi(option); + po_remove_all(options, "port"); + } + nfs_server.pmap.pm_prog = NFS_PROGRAM; + option = po_get(options, "nfsprog"); + if (option) + nfs_server.pmap.pm_prog = atoi(option); + + option = po_get(options, "nfsvers"); + if (option) { + nfs_server.pmap.pm_vers = atoi(option); + po_remove_all(options, "nfsvers"); + } + option = po_get(options, "vers"); + if (option) { + nfs_server.pmap.pm_vers = atoi(option); + po_remove_all(options, "vers"); + } + option = po_get(options, "proto"); + if (option) { + if (strcmp(option, "tcp") == 0) { + nfs_server.pmap.pm_prot = IPPROTO_TCP; + po_remove_all(options, "proto"); + } + if (strcmp(option, "udp") == 0) { + nfs_server.pmap.pm_prot = IPPROTO_UDP; + po_remove_all(options, "proto"); + } + } + p = po_rightmost(options, "tcp", "udp"); + switch (p) { + case PO_KEY2_RIGHTMOST: + nfs_server.pmap.pm_prot = IPPROTO_UDP; + break; + case PO_KEY1_RIGHTMOST: + nfs_server.pmap.pm_prot = IPPROTO_TCP; + break; + } + po_remove_all(options, "tcp"); + po_remove_all(options, "udp"); - options = po_split(*extra_opts); - if (!options) { - nfs_error(_("%s: internal option parsing error"), progname); - goto out; + if (!probe_bothports(&mnt_server, &nfs_server)) { + rpc_mount_errors("rpcbind", 0, 0); + goto err; } - if (!append_addr_option(&saddr, options)) - goto out; + snprintf(new_option, sizeof(new_option) - 1, + "nfsvers=%lu", nfs_server.pmap.pm_vers); + if (po_append(options, new_option) == PO_FAILED) + goto err; + + if (nfs_server.pmap.pm_prot == IPPROTO_TCP) + snprintf(new_option, sizeof(new_option) - 1, + "proto=tcp"); + else + snprintf(new_option, sizeof(new_option) - 1, + "proto=udp"); + if (po_append(options, new_option) == PO_FAILED) + goto err; + + if (nfs_server.pmap.pm_port != NFS_PORT) { + snprintf(new_option, sizeof(new_option) - 1, + "port=%lu", nfs_server.pmap.pm_port); + if (po_append(options, new_option) == PO_FAILED) + goto err; + } + + return options; + +err: + po_destroy(options); + return NULL; +} + +/* + * Retry an NFS mount that failed because the requested service isn't + * available on the server. + * + * Returns 1 if successful. Otherwise, returns zero. + * "errno" is set to reflect the individual error. + * + * Side effect: If the retry is successful, both 'options' and + * 'extra_opts' are updated to reflect the mount options that worked. + * If the retry fails, 'options' and 'extra_opts' are left unchanged. + */ +static int retry_nfsmount(const char *spec, const char *node, + int flags, struct mount_options *options, + int fake, char **extra_opts) +{ + struct mount_options *retry_options; + char *retry_str = NULL; + + retry_options = rewrite_mount_options(*extra_opts); + if (!retry_options) { + errno = EIO; + return 0; + } + + if (po_join(retry_options, &retry_str) == PO_FAILED) { + po_destroy(retry_options); + errno = EIO; + return 0; + } + + if (verbose) + printf(_("%s: text-based options (retry): '%s'\n"), + progname, retry_str); + + if (!mount(spec, node, "nfs", + flags & ~(MS_USER|MS_USERS), retry_str)) { + free(*extra_opts); + *extra_opts = retry_str; + po_replace(options, retry_options); + return 1; + } + + po_destroy(retry_options); + free(retry_str); + return 0; +} + +/* + * Attempt an NFSv2/3 mount via a mount(2) system call. If the kernel + * claims the requested service isn't supported on the server, probe + * the server to see what's supported, rewrite the mount options, + * and retry the request. + * + * Returns 1 if successful. Otherwise, returns zero. + * "errno" is set to reflect the individual error. + * + * Side effect: If the retry is successful, both 'options' and + * 'extra_opts' are updated to reflect the mount options that worked. + * If the retry fails, 'options' and 'extra_opts' are left unchanged. + */ +static int try_nfs23mount(const char *spec, const char *node, + int flags, struct mount_options *options, + int fake, char **extra_opts) +{ if (po_join(options, extra_opts) == PO_FAILED) { - nfs_error(_("%s: internal option parsing error"), progname); - goto out; + errno = EIO; + return 0; } if (verbose) printf(_("%s: text-based options: '%s'\n"), progname, *extra_opts); - if (!fake) { - if (mount(spec, node, "nfs", - flags & ~(MS_USER|MS_USERS), *extra_opts)) { - mount_error(spec, node, errno); - goto out; - } + if (fake) + return 1; + + if (!mount(spec, node, "nfs", + flags & ~(MS_USER|MS_USERS), *extra_opts)) + return 1; + + /* + * The kernel returns EOPNOTSUPP if the RPC bind failed, + * and EPROTONOSUPPORT if the version isn't supported. + */ + if (errno != EOPNOTSUPP && errno != EPROTONOSUPPORT) + return 0; + + return retry_nfsmount(spec, node, flags, options, fake, extra_opts); +} + +/* + * Attempt an NFS v4 mount via a mount(2) system call. + * + * Returns 1 if successful. Otherwise, returns zero. + * "errno" is set to reflect the individual error. + */ +static int try_nfs4mount(const char *spec, const char *node, + int flags, struct mount_options *options, + int fake, char **extra_opts) +{ + if (po_join(options, extra_opts) == PO_FAILED) { + errno = EIO; + return 0; } - retval = EX_SUCCESS; + if (verbose) + printf(_("%s: text-based options: '%s'\n"), + progname, *extra_opts); -out: - po_destroy(options); - return retval; + if (fake) + return 1; + + if (!mount(spec, node, "nfs4", + flags & ~(MS_USER|MS_USERS), *extra_opts)) + return 1; + return 0; } /* - * nfs4mount_s - Mount an NFSv4 file system using C string options + * Try the mount(2) system call. * - * @spec: C string hostname:path specifying remoteshare to mount - * @node: C string pathname of local mounted on directory - * @flags: MS_ style flags - * @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 - * @child: one if this is a backgrounded mount + * Returns 1 if successful. Otherwise, returns zero. + * "errno" is set to reflect the individual error. + */ +static int try_mount(const char *spec, const char *node, const char *type, + int flags, struct mount_options *options, int fake, + char **extra_opts) +{ + if (strncmp(type, "nfs4", 4) == 0) + return try_nfs4mount(spec, node, flags, + options, fake, extra_opts); + else + return try_nfs23mount(spec, node, flags, + options, fake, extra_opts); +} + +/* + * Handle "foreground" NFS mounts. * - * XXX: need to handle bg, fg, and retry options. + * Retry the mount request for as long as the 'retry=' option says. * + * Returns a valid mount command exit code. */ -int nfs4mount_s(const char *spec, const char *node, int flags, - char **extra_opts, int fake, int child) +static int nfsmount_fg(const char *spec, const char *node, + const char *type, int flags, + struct mount_options *options, int fake, + char **extra_opts) +{ + unsigned int secs = 1; + time_t timeout = time(NULL); + char *retry; + + timeout += 60 * 2; /* default: 2 minutes */ + retry = po_get(options, "retry"); + if (retry) + timeout += 60 * atoi(retry); + + if (verbose) + printf(_("%s: timeout set for %s"), + progname, ctime(&timeout)); + + for (;;) { + if (try_mount(spec, node, type, flags, + options, fake, extra_opts)) + return EX_SUCCESS; + + if (is_permanent_error(errno)) + break; + + if (time(NULL) > timeout) { + errno = ETIMEDOUT; + break; + } + + if (errno != ETIMEDOUT) { + if (sleep(secs)) + break; + secs <<= 1; + if (secs > 10) + secs = 10; + } + }; + + mount_error(spec, node, errno); + return EX_FAIL; +} + +/** + * nfsmount_string - Mount an NFS file system using C string options + * @spec: C string specifying remote share to mount ("hostname:path") + * @node: C string pathname of local mounted-on directory + * @type: C string that represents file system type ("nfs" or "nfs4") + * @flags: MS_ style mount flags + * @extra_opts: pointer to C string containing fs-specific mount options + * (input and output argument) + * @fake: flag indicating whether to carry out the whole operation + * @child: one if this is a mount daemon (bg) + */ +int nfsmount_string(const char *spec, const char *node, const char *type, + int flags, char **extra_opts, int fake, int child) { struct mount_options *options = NULL; struct sockaddr_in saddr; @@ -286,29 +607,14 @@ int nfs4mount_s(const char *spec, const char *node, int flags, goto out; } - if (!append_addr_option(&saddr, options)) - goto out; - - if (!append_clientaddr_option(&saddr, options)) + if (!set_mandatory_options(type, &saddr, options)) goto out; - if (po_join(options, extra_opts) == PO_FAILED) { - nfs_error(_("%s: internal option parsing error"), progname); + if (try_mount(spec, node, type, flags, options, fake, extra_opts)) { + mount_error(spec, node, errno); goto out; } - if (verbose) - printf(_("%s: text-based options: '%s'\n"), - progname, *extra_opts); - - if (!fake) { - if (mount(spec, node, "nfs4", - flags & ~(MS_USER|MS_USERS), *extra_opts)) { - mount_error(spec, node, errno); - goto out; - } - } - retval = EX_SUCCESS; out: