X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fstropts.c;h=50a1a2a06626a72ba2c09fe656df3331e66a85b1;hp=34b4134076cf1faa8aa7bd54e6665549338a4ca7;hb=a88c279992f4b63e3dcaac9930e300fd4bb03dd7;hpb=8bca04ebcc345784bf2ef29f0781e66157d76558 diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c index 34b4134..50a1a2a 100644 --- a/utils/mount/stropts.c +++ b/utils/mount/stropts.c @@ -25,37 +25,40 @@ #include #endif -#include #include -#include -#include -#include #include #include #include + #include #include +#include +#include +#include "sockaddr.h" #include "xcommon.h" #include "mount.h" #include "nls.h" -#include "nfs_mount.h" +#include "nfsrpc.h" #include "mount_constants.h" #include "stropts.h" #include "error.h" #include "network.h" #include "parse_opt.h" #include "version.h" +#include "parse_dev.h" +#include "conffile.h" -#ifdef HAVE_RPCSVC_NFS_PROT_H -#include -#else -#include -#define nfsstat nfs_stat +#ifndef HAVE_DECL_AI_ADDRCONFIG +#define AI_ADDRCONFIG 0 +#endif + +#ifndef NFS_PROGRAM +#define NFS_PROGRAM (100003) #endif #ifndef NFS_PORT -#define NFS_PORT 2049 +#define NFS_PORT (2049) #endif #ifndef NFS_MAXHOSTNAME @@ -84,86 +87,35 @@ struct nfsmount_info { *node, /* mounted-on dir */ *type; /* "nfs" or "nfs4" */ char *hostname; /* server's hostname */ + struct addrinfo *address; /* server's addresses */ struct mount_options *options; /* parsed mount options */ char **extra_opts; /* string for /etc/mtab */ + unsigned long version; /* NFS version */ int flags, /* MS_ flags */ fake, /* actually do the mount? */ child; /* forked bg child? */ }; -static int nfs_parse_devname(struct nfsmount_info *mi) -{ - int ret = 0; - char *dev, *pathname, *s; - - dev = xstrdup(mi->spec); - - 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); - goto out; - } +#ifdef MOUNT_CONFIG +static void nfs_default_version(struct nfsmount_info *mi); +static void nfs_default_version(struct nfsmount_info *mi) +{ + extern unsigned long config_default_vers; /* - * Ignore all but first hostname in replicated mounts - * until they can be fully supported. (mack@sgi.com) + * Use the default value set in the config file when + * the version has not been explicitly set. */ - 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); + if (mi->version == 0 && config_default_vers) { + if (config_default_vers < 4) + mi->version = config_default_vers; } - mi->hostname = xstrdup(dev); - if (strlen(mi->hostname) > NFS_MAXHOSTNAME) { - nfs_error(_("%s: server hostname is too long"), - progname); - free(mi->hostname); - mi->hostname = NULL; - goto out; - } - - ret = 1; - -out: - free(dev); - return ret; -} - -static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr) -{ - struct hostent *hp; - addr->sin_family = AF_INET; - - if (inet_aton(hostname, &addr->sin_addr)) - return 1; - if ((hp = gethostbyname(hostname)) == NULL) { - nfs_error(_("%s: can't get address for %s\n"), - progname, hostname); - return 0; - } - if (hp->h_length > sizeof(struct in_addr)) { - nfs_error(_("%s: got bad hp->h_length"), progname); - hp->h_length = sizeof(struct in_addr); - } - memcpy(&addr->sin_addr, hp->h_addr, hp->h_length); - return 1; } +#else +inline void nfs_default_version(struct nfsmount_info *mi) {} +#endif /* MOUNT_CONFIG */ /* * Obtain a retry timeout value based on the value of the "retry=" option. @@ -173,24 +125,59 @@ static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr) static time_t nfs_parse_retry_option(struct mount_options *options, unsigned int timeout_minutes) { - char *retry_option, *endptr; + long tmp; - retry_option = po_get(options, "retry"); - if (retry_option) { - long tmp; - - errno = 0; - tmp = strtol(retry_option, &endptr, 10); - if (errno == 0 && endptr != retry_option && tmp >= 0) + switch (po_get_numeric(options, "retry", &tmp)) { + case PO_NOT_FOUND: + break; + case PO_FOUND: + if (tmp >= 0) { timeout_minutes = tmp; - else if (verbose) + break; + } + case PO_BAD_VALUE: + if (verbose) nfs_error(_("%s: invalid retry timeout was specified; " "using default timeout"), progname); + break; } return time(NULL) + (time_t)(timeout_minutes * 60); } +/* + * Convert the passed-in sockaddr-style address to presentation + * format, then append an option of the form "keyword=address". + * + * Returns 1 if the option was appended successfully; otherwise zero. + */ +static int nfs_append_generic_address_option(const struct sockaddr *sap, + const socklen_t salen, + const char *keyword, + struct mount_options *options) +{ + char address[NI_MAXHOST]; + char new_option[512]; + int len; + + if (!nfs_present_sockaddr(sap, salen, address, sizeof(address))) + goto out_err; + + len = snprintf(new_option, sizeof(new_option), "%s=%s", + keyword, address); + if (len < 0 || (size_t)len >= sizeof(new_option)) + goto out_err; + + if (po_append(options, new_option) != PO_SUCCEEDED) + goto out_err; + + return 1; + +out_err: + nfs_error(_("%s: failed to construct %s option"), progname, keyword); + return 0; +} + /* * Append the 'addr=' option to the options string to pass a resolved * server address to the kernel. After a successful mount, this address @@ -203,19 +190,12 @@ static time_t nfs_parse_retry_option(struct mount_options *options, * Returns 1 if 'addr=' option appended successfully; * otherwise zero. */ -static int append_addr_option(struct sockaddr_in *saddr, - struct mount_options *options) +static int nfs_append_addr_option(const struct sockaddr *sap, + socklen_t salen, + struct mount_options *options) { - char new_option[24]; - po_remove_all(options, "addr"); - - snprintf(new_option, sizeof(new_option) - 1, - "addr=%s", inet_ntoa(saddr->sin_addr)); - - if (po_append(options, new_option) == PO_SUCCEEDED) - return 1; - return 0; + return nfs_append_generic_address_option(sap, salen, "addr", options); } /* @@ -225,57 +205,73 @@ static int append_addr_option(struct sockaddr_in *saddr, * Returns 1 if 'clientaddr=' option created successfully or if * 'clientaddr=' option is already present; otherwise zero. */ -static int append_clientaddr_option(struct sockaddr_in *saddr, - struct mount_options *options) +static int nfs_append_clientaddr_option(const struct sockaddr *sap, + socklen_t salen, + struct mount_options *options) { - struct sockaddr_in my_addr; - char new_option[32]; + union nfs_sockaddr address; + struct sockaddr *my_addr = &address.sa; + socklen_t my_len = sizeof(address); - if (po_contains(options, "clientaddr") == PO_SUCCEEDED) + if (po_contains(options, "clientaddr") == PO_FOUND) return 1; - if (!get_client_address(saddr, &my_addr)) - return 0; - - snprintf(new_option, sizeof(new_option) - 1, - "clientaddr=%s", inet_ntoa(my_addr.sin_addr)); + nfs_callback_address(sap, salen, my_addr, &my_len); - if (po_append(options, new_option) == PO_SUCCEEDED) - return 1; - return 0; + return nfs_append_generic_address_option(my_addr, my_len, + "clientaddr", options); } /* - * Resolve the 'mounthost=' hostname and append a new option using - * the resulting IPv4 address. + * Determine whether to append a 'mountaddr=' option. The option is needed if: + * + * 1. "mounthost=" was specified, or + * 2. The address families for proto= and mountproto= are different. */ -static int fix_mounthost_option(struct mount_options *options) +static int nfs_fix_mounthost_option(struct mount_options *options, + const char *nfs_hostname) { - struct sockaddr_in maddr; - char *mounthost, new_option[32]; + union nfs_sockaddr address; + struct sockaddr *sap = &address.sa; + socklen_t salen = sizeof(address); + sa_family_t nfs_family, mnt_family; + char *mounthost; + + if (!nfs_nfs_proto_family(options, &nfs_family)) + return 0; + if (!nfs_mount_proto_family(options, &mnt_family)) + return 0; mounthost = po_get(options, "mounthost"); - if (!mounthost) - return 1; + if (mounthost == NULL) { + if (nfs_family == mnt_family) + return 1; + mounthost = (char *)nfs_hostname; + } - if (!fill_ipv4_sockaddr(mounthost, &maddr)) + if (!nfs_lookup(mounthost, mnt_family, sap, &salen)) { + nfs_error(_("%s: unable to determine mount server's address"), + progname); 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; + return nfs_append_generic_address_option(sap, salen, + "mountaddr", options); } /* * Returns zero if the "lock" option is in effect, but statd * can't be started. Otherwise, returns 1. */ -static int verify_lock_option(struct mount_options *options) +static const char *nfs_lock_opttbl[] = { + "nolock", + "lock", + NULL, +}; + +static int nfs_verify_lock_option(struct mount_options *options) { - if (po_rightmost(options, "nolock", "lock") == PO_KEY1_RIGHTMOST) + if (po_rightmost(options, nfs_lock_opttbl) == 0) return 1; if (!start_statd()) { @@ -299,55 +295,181 @@ static int nfs_append_sloppy_option(struct mount_options *options) return 1; } +static int nfs_set_version(struct nfsmount_info *mi) +{ + if (!nfs_nfs_version(mi->options, &mi->version)) + return 0; + + if (strncmp(mi->type, "nfs4", 4) == 0) + mi->version = 4; + + /* + * Before 2.6.32, the kernel NFS client didn't + * support "-t nfs vers=4" mounts, so NFS version + * 4 cannot be included when autonegotiating + * while running on those kernels. + */ + if (mi->version == 0 && + linux_version_code() <= MAKE_VERSION(2, 6, 31)) + mi->version = 3; + + /* + * If we still don't know, check for version-specific + * mount options. + */ + if (mi->version == 0) { + if (po_contains(mi->options, "mounthost") || + po_contains(mi->options, "mountaddr") || + po_contains(mi->options, "mountvers") || + po_contains(mi->options, "mountproto")) + mi->version = 3; + } + + /* + * If enabled, see if the default version was + * set in the config file + */ + nfs_default_version(mi); + + return 1; +} + /* - * Set up mandatory NFS mount options. + * Set up mandatory non-version specific NFS mount options. * * Returns 1 if successful; otherwise zero. */ static int nfs_validate_options(struct nfsmount_info *mi) { - struct sockaddr_in saddr; + struct addrinfo hint = { + .ai_protocol = (int)IPPROTO_UDP, + .ai_flags = AI_ADDRCONFIG, + }; + sa_family_t family; + int error; - if (!fill_ipv4_sockaddr(mi->hostname, &saddr)) + if (!nfs_parse_devname(mi->spec, &mi->hostname, NULL)) return 0; - if (strncmp(mi->type, "nfs4", 4) == 0) { - if (!append_clientaddr_option(&saddr, mi->options)) - return 0; - } else { - if (!fix_mounthost_option(mi->options)) - return 0; - if (!mi->fake && !verify_lock_option(mi->options)) - return 0; + if (!nfs_nfs_proto_family(mi->options, &family)) + return 0; + + hint.ai_family = (int)family; + error = getaddrinfo(mi->hostname, NULL, &hint, &mi->address); + if (error != 0) { + nfs_error(_("%s: Failed to resolve server %s: %s"), + progname, mi->hostname, gai_strerror(error)); + mi->address = NULL; + return 0; } + if (!nfs_set_version(mi)) + return 0; + if (!nfs_append_sloppy_option(mi->options)) return 0; - if (!append_addr_option(&saddr, mi->options)) + if (!nfs_append_addr_option(mi->address->ai_addr, + mi->address->ai_addrlen, mi->options)) return 0; return 1; } /* - * Distinguish between permanent and temporary errors. + * Get NFS/mnt server addresses from mount 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. + * Returns 1 and fills in @nfs_saddr, @nfs_salen, @mnt_saddr, and @mnt_salen + * if all goes well; otherwise zero. */ -static int is_permanent_error(int error) +static int nfs_extract_server_addresses(struct mount_options *options, + struct sockaddr *nfs_saddr, + socklen_t *nfs_salen, + struct sockaddr *mnt_saddr, + socklen_t *mnt_salen) { - switch (error) { - case ESTALE: - case ETIMEDOUT: - case ECONNREFUSED: - return 0; /* temporary */ - default: - return 1; /* permanent */ + char *option; + + option = po_get(options, "addr"); + if (option == NULL) + return 0; + if (!nfs_string_to_sockaddr(option, nfs_saddr, nfs_salen)) + return 0; + + option = po_get(options, "mountaddr"); + if (option == NULL) { + memcpy(mnt_saddr, nfs_saddr, *nfs_salen); + *mnt_salen = *nfs_salen; + } else if (!nfs_string_to_sockaddr(option, mnt_saddr, mnt_salen)) + return 0; + + return 1; +} + +static int nfs_construct_new_options(struct mount_options *options, + struct sockaddr *nfs_saddr, + struct pmap *nfs_pmap, + struct sockaddr *mnt_saddr, + struct pmap *mnt_pmap) +{ + char new_option[64]; + char *netid; + + po_remove_all(options, "nfsprog"); + po_remove_all(options, "mountprog"); + + po_remove_all(options, "v2"); + po_remove_all(options, "v3"); + po_remove_all(options, "vers"); + po_remove_all(options, "nfsvers"); + snprintf(new_option, sizeof(new_option) - 1, + "vers=%lu", nfs_pmap->pm_vers); + if (po_append(options, new_option) == PO_FAILED) + return 0; + + po_remove_all(options, "proto"); + po_remove_all(options, "udp"); + po_remove_all(options, "tcp"); + netid = nfs_get_netid(nfs_saddr->sa_family, nfs_pmap->pm_prot); + if (netid == NULL) + return 0; + snprintf(new_option, sizeof(new_option) - 1, + "proto=%s", netid); + free(netid); + if (po_append(options, new_option) == PO_FAILED) + return 0; + + po_remove_all(options, "port"); + if (nfs_pmap->pm_port != NFS_PORT) { + snprintf(new_option, sizeof(new_option) - 1, + "port=%lu", nfs_pmap->pm_port); + if (po_append(options, new_option) == PO_FAILED) + return 0; } + + po_remove_all(options, "mountvers"); + snprintf(new_option, sizeof(new_option) - 1, + "mountvers=%lu", mnt_pmap->pm_vers); + if (po_append(options, new_option) == PO_FAILED) + return 0; + + po_remove_all(options, "mountproto"); + netid = nfs_get_netid(mnt_saddr->sa_family, mnt_pmap->pm_prot); + if (netid == NULL) + return 0; + snprintf(new_option, sizeof(new_option) - 1, + "mountproto=%s", netid); + free(netid); + if (po_append(options, new_option) == PO_FAILED) + return 0; + + po_remove_all(options, "mountport"); + snprintf(new_option, sizeof(new_option) - 1, + "mountport=%lu", mnt_pmap->pm_port); + if (po_append(options, new_option) == PO_FAILED) + return 0; + + return 1; } /* @@ -357,140 +479,107 @@ static int is_permanent_error(int error) * * 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() + * portmap probe. Mount options that nfs_rewrite_pmap_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. + * Returns TRUE if rewriting was successful; otherwise + * FALSE is returned if some failure occurred. */ -static struct mount_options *rewrite_mount_options(char *str) +static int +nfs_rewrite_pmap_mount_options(struct mount_options *options) { - struct mount_options *options; - char *option, new_option[64]; - clnt_addr_t mnt_server = { }; - clnt_addr_t nfs_server = { }; - int p; + union nfs_sockaddr nfs_address; + struct sockaddr *nfs_saddr = &nfs_address.sa; + socklen_t nfs_salen = sizeof(nfs_address); + struct pmap nfs_pmap; + union nfs_sockaddr mnt_address; + struct sockaddr *mnt_saddr = &mnt_address.sa; + socklen_t mnt_salen = sizeof(mnt_address); + unsigned long protocol; + struct pmap mnt_pmap; - options = po_split(str); - if (!options) { - errno = EFAULT; - return NULL; - } - - errno = EINVAL; - 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, "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"); + /* + * Version and transport negotiation is not required + * and does not work for RDMA mounts. + */ + if (!nfs_nfs_protocol(options, &protocol)) { + errno = EINVAL; + return 0; } - nfs_server.pmap.pm_prog = NFS_PROGRAM; + if (protocol == NFSPROTO_RDMA) + goto out; - 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"); - } + /* + * Extract just the options needed to contact server. + * Bail now if any of these have bad values. + */ + if (!nfs_extract_server_addresses(options, nfs_saddr, &nfs_salen, + mnt_saddr, &mnt_salen)) { + errno = EINVAL; + return 0; } - 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; + if (!nfs_options2pmap(options, &nfs_pmap, &mnt_pmap)) { + errno = EINVAL; + return 0; } - po_remove_all(options, "tcp"); - po_remove_all(options, "udp"); - if (!probe_bothports(&mnt_server, &nfs_server)) { + /* + * The kernel NFS client doesn't support changing the RPC + * program number for these services, so force the value of + * these fields before probing the server's ports. + */ + nfs_pmap.pm_prog = NFS_PROGRAM; + mnt_pmap.pm_prog = MOUNTPROG; + + /* + * If the server's rpcbind service isn't available, we can't + * negotiate. Bail now if we can't contact it. + */ + if (!nfs_probe_bothports(mnt_saddr, mnt_salen, &mnt_pmap, + nfs_saddr, nfs_salen, &nfs_pmap)) { errno = ESPIPE; - goto err; + if (rpc_createerr.cf_stat == RPC_PROGNOTREGISTERED) + errno = EOPNOTSUPP; + else if (rpc_createerr.cf_error.re_errno != 0) + errno = rpc_createerr.cf_error.re_errno; + return 0; } - 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; - + if (!nfs_construct_new_options(options, nfs_saddr, &nfs_pmap, + mnt_saddr, &mnt_pmap)) { + if (rpc_createerr.cf_stat == RPC_UNKNOWNPROTO) + errno = EPROTONOSUPPORT; + else + errno = EINVAL; + return 0; } +out: errno = 0; - return options; - -err: - po_destroy(options); - return NULL; + return 1; } /* * Do the mount(2) system call. * - * Returns 1 if successful, otherwise zero. + * Returns TRUE if successful, otherwise FALSE. * "errno" is set to reflect the individual error. */ -static int nfs_sys_mount(const struct nfsmount_info *mi, const char *type, - const char *options) +static int nfs_sys_mount(struct nfsmount_info *mi, struct mount_options *opts) { + char *options = NULL; int result; - result = mount(mi->spec, mi->node, type, - mi->flags & ~(MS_USER|MS_USERS), options); + if (po_join(opts, &options) == PO_FAILED) { + errno = EIO; + return 0; + } + + if (mi->fake) + return 1; + + result = mount(mi->spec, mi->node, mi->type, + mi->flags & ~(MS_USER|MS_USERS), options); if (verbose && result) { int save = errno; nfs_error(_("%s: mount(2): %s"), progname, strerror(save)); @@ -499,128 +588,266 @@ static int nfs_sys_mount(const struct nfsmount_info *mi, const char *type, return !result; } -/* - * 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 nfs_retry_nfs23mount(struct nfsmount_info *mi) +static int nfs_do_mount_v3v2(struct nfsmount_info *mi, + struct sockaddr *sap, socklen_t salen) { - struct mount_options *retry_options; - char *retry_str = NULL; - char **extra_opts = mi->extra_opts; + struct mount_options *options = po_dup(mi->options); + int result = 0; - retry_options = rewrite_mount_options(*extra_opts); - if (!retry_options) - return 0; + if (!options) { + errno = ENOMEM; + return result; + } + errno = 0; + if (!nfs_append_addr_option(sap, salen, options)) { + if (errno == 0) + errno = EINVAL; + goto out_fail; + } - if (po_join(retry_options, &retry_str) == PO_FAILED) { - po_destroy(retry_options); - errno = EIO; - return 0; + if (!nfs_fix_mounthost_option(options, mi->hostname)) { + if (errno == 0) + errno = EINVAL; + goto out_fail; + } + if (!mi->fake && !nfs_verify_lock_option(options)) { + if (errno == 0) + errno = EINVAL; + goto out_fail; + } + + /* + * Options we negotiate below may be stale by the time this + * file system is unmounted. In order to force umount.nfs + * to renegotiate with the server, only write the user- + * specified options, and not negotiated options, to /etc/mtab. + */ + if (po_join(options, mi->extra_opts) == PO_FAILED) { + errno = ENOMEM; + goto out_fail; } if (verbose) - printf(_("%s: text-based options (retry): '%s'\n"), - progname, retry_str); + printf(_("%s: trying text-based options '%s'\n"), + progname, *mi->extra_opts); - if (!nfs_sys_mount(mi, "nfs", retry_str)) { - po_destroy(retry_options); - free(retry_str); - return 0; - } + if (!nfs_rewrite_pmap_mount_options(options)) + goto out_fail; - free(*extra_opts); - *extra_opts = retry_str; - po_replace(mi->options, retry_options); - return 1; + result = nfs_sys_mount(mi, options); + +out_fail: + po_destroy(options); + return result; } /* - * 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. + * Attempt a "-t nfs vers=2" or "-t nfs vers=3" mount. * - * Returns 1 if successful. Otherwise, returns zero. + * Returns TRUE if successful, otherwise FALSE. * "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 nfs_try_nfs23mount(struct nfsmount_info *mi) +static int nfs_try_mount_v3v2(struct nfsmount_info *mi) +{ + struct addrinfo *ai; + int ret; + + for (ai = mi->address; ai != NULL; ai = ai->ai_next) { + ret = nfs_do_mount_v3v2(mi, ai->ai_addr, ai->ai_addrlen); + if (ret != 0) + return ret; + + switch (errno) { + case ECONNREFUSED: + case EOPNOTSUPP: + case EHOSTUNREACH: + continue; + default: + break; + } + } + return ret; +} + +static int nfs_do_mount_v4(struct nfsmount_info *mi, + struct sockaddr *sap, socklen_t salen) { - char **extra_opts = mi->extra_opts; + struct mount_options *options = po_dup(mi->options); + int result = 0; - if (po_join(mi->options, extra_opts) == PO_FAILED) { - errno = EIO; - return 0; + if (!options) { + errno = ENOMEM; + return result; } - if (verbose) - printf(_("%s: text-based options: '%s'\n"), - progname, *extra_opts); + if (mi->version == 0) { + if (po_contains(options, "mounthost") || + po_contains(options, "mountaddr") || + po_contains(options, "mountvers") || + po_contains(options, "mountproto")) { + /* + * Since these mountd options are set assume version 3 + * is wanted so error out with EPROTONOSUPPORT so the + * protocol negation starts with v3. + */ + errno = EPROTONOSUPPORT; + goto out_fail; + } + if (po_append(options, "vers=4") == PO_FAILED) { + errno = EINVAL; + goto out_fail; + } + } - if (mi->fake) - return 1; + if (!nfs_append_addr_option(sap, salen, options)) { + errno = EINVAL; + goto out_fail; + } - if (nfs_sys_mount(mi, "nfs", *extra_opts)) - return 1; + if (!nfs_append_clientaddr_option(sap, salen, options)) { + errno = EINVAL; + goto out_fail; + } /* - * The kernel returns EOPNOTSUPP if the RPC bind failed, - * and EPROTONOSUPPORT if the version isn't supported. + * Update option string to be recorded in /etc/mtab. */ - if (errno != EOPNOTSUPP && errno != EPROTONOSUPPORT) - return 0; + if (po_join(options, mi->extra_opts) == PO_FAILED) { + errno = ENOMEM; + goto out_fail; + } + + if (verbose) + printf(_("%s: trying text-based options '%s'\n"), + progname, *mi->extra_opts); + + result = nfs_sys_mount(mi, options); - return nfs_retry_nfs23mount(mi); +out_fail: + po_destroy(options); + return result; } /* - * Attempt an NFS v4 mount via a mount(2) system call. + * Attempt a "-t nfs -o vers=4" or "-t nfs4" mount. * - * Returns 1 if successful. Otherwise, returns zero. + * Returns TRUE if successful, otherwise FALSE. * "errno" is set to reflect the individual error. */ -static int nfs_try_nfs4mount(struct nfsmount_info *mi) +static int nfs_try_mount_v4(struct nfsmount_info *mi) { - char **extra_opts = mi->extra_opts; - - if (po_join(mi->options, extra_opts) == PO_FAILED) { - errno = EIO; - return 0; + struct addrinfo *ai; + int ret; + + for (ai = mi->address; ai != NULL; ai = ai->ai_next) { + ret = nfs_do_mount_v4(mi, ai->ai_addr, ai->ai_addrlen); + if (ret != 0) + return ret; + + switch (errno) { + case ECONNREFUSED: + case EHOSTUNREACH: + continue; + default: + break; + } } + return ret; +} - if (verbose) - printf(_("%s: text-based options: '%s'\n"), - progname, *extra_opts); +/* + * Handle NFS version and transport protocol + * autonegotiation. + * + * When no version or protocol is specified on the + * command line, mount.nfs negotiates with the server + * to determine appropriate settings for the new + * mount point. + * + * Returns TRUE if successful, otherwise FALSE. + * "errno" is set to reflect the individual error. + */ +static int nfs_autonegotiate(struct nfsmount_info *mi) +{ + int result; - if (mi->fake) - return 1; + result = nfs_try_mount_v4(mi); + if (result) + return result; + + switch (errno) { + case EPROTONOSUPPORT: + /* A clear indication that the server or our + * client does not support NFS version 4. */ + goto fall_back; + case ENOENT: + /* Legacy Linux servers don't export an NFS + * version 4 pseudoroot. */ + goto fall_back; + case EPERM: + /* Linux servers prior to 2.6.25 may return + * EPERM when NFS version 4 is not supported. */ + goto fall_back; + default: + return result; + } - return nfs_sys_mount(mi, "nfs4", *extra_opts); +fall_back: + return nfs_try_mount_v3v2(mi); } /* - * Perform either an NFSv2/3 mount, or an NFSv4 mount system call. + * This is a single pass through the fg/bg loop. * - * Returns 1 if successful. Otherwise, returns zero. + * Returns TRUE if successful, otherwise FALSE. * "errno" is set to reflect the individual error. */ static int nfs_try_mount(struct nfsmount_info *mi) { - if (strncmp(mi->type, "nfs4", 4) == 0) - return nfs_try_nfs4mount(mi); - else - return nfs_try_nfs23mount(mi); + int result = 0; + + switch (mi->version) { + case 0: + result = nfs_autonegotiate(mi); + break; + case 2: + case 3: + result = nfs_try_mount_v3v2(mi); + break; + case 4: + result = nfs_try_mount_v4(mi); + break; + default: + errno = EIO; + } + + return result; +} + +/* + * Distinguish between permanent and temporary errors. + * + * Basically, we retry if communication with the server has + * failed so far, but fail immediately if there is a local + * error (like a bad mount option). + * + * ESTALE is also a temporary error because some servers + * return ESTALE when a share is temporarily offline. + * + * Returns 1 if we should fail immediately, or 0 if we + * should retry. + */ +static int nfs_is_permanent_error(int error) +{ + switch (error) { + case ESTALE: + case ETIMEDOUT: + case ECONNREFUSED: + case EHOSTUNREACH: + return 0; /* temporary */ + default: + return 1; /* permanent */ + } } /* @@ -645,7 +872,7 @@ static int nfsmount_fg(struct nfsmount_info *mi) if (nfs_try_mount(mi)) return EX_SUCCESS; - if (is_permanent_error(errno)) + if (nfs_is_permanent_error(errno)) break; if (time(NULL) > timeout) { @@ -678,7 +905,7 @@ static int nfsmount_parent(struct nfsmount_info *mi) if (nfs_try_mount(mi)) return EX_SUCCESS; - if (is_permanent_error(errno)) { + if (nfs_is_permanent_error(errno)) { mount_error(mi->spec, mi->node, errno); return EX_FAIL; } @@ -713,7 +940,7 @@ static int nfsmount_child(struct nfsmount_info *mi) if (nfs_try_mount(mi)) return EX_SUCCESS; - if (is_permanent_error(errno)) + if (nfs_is_permanent_error(errno)) break; if (time(NULL) > timeout) @@ -739,17 +966,49 @@ static int nfsmount_bg(struct nfsmount_info *mi) return nfsmount_child(mi); } +/* + * Usually all that is needed for an NFS remount is to change + * generic mount options like "sync" or "ro". These generic + * options are controlled by mi->flags, not by text-based + * options, and no contact with the server is needed. + * + * Take care with the /etc/mtab entry for this mount; just + * calling update_mtab() will change an "-t nfs -o vers=4" + * mount to an "-t nfs -o remount" mount, and that will + * confuse umount.nfs. + * + * Returns a valid mount command exit code. + */ +static int nfs_remount(struct nfsmount_info *mi) +{ + if (nfs_sys_mount(mi, mi->options)) + return EX_SUCCESS; + return EX_FAIL; +} + /* * Process mount options and try a mount system call. * * Returns a valid mount command exit code. */ +static const char *nfs_background_opttbl[] = { + "bg", + "fg", + NULL, +}; + static int nfsmount_start(struct nfsmount_info *mi) { if (!nfs_validate_options(mi)) return EX_FAIL; - if (po_rightmost(mi->options, "bg", "fg") == PO_KEY1_RIGHTMOST) + /* + * Avoid retry and negotiation logic when remounting + */ + if (mi->flags & MS_REMOUNT) + return nfs_remount(mi); + + if (po_rightmost(mi->options, nfs_background_opttbl) == 0) return nfsmount_bg(mi); else return nfsmount_fg(mi); @@ -765,6 +1024,8 @@ static int nfsmount_start(struct nfsmount_info *mi) * (input and output argument) * @fake: flag indicating whether to carry out the whole operation * @child: one if this is a mount daemon (bg) + * + * Returns a valid mount command exit code. */ int nfsmount_string(const char *spec, const char *node, const char *type, int flags, char **extra_opts, int fake, int child) @@ -772,6 +1033,7 @@ int nfsmount_string(const char *spec, const char *node, const char *type, struct nfsmount_info mi = { .spec = spec, .node = node, + .address = NULL, .type = type, .extra_opts = extra_opts, .flags = flags, @@ -780,9 +1042,6 @@ int nfsmount_string(const char *spec, const char *node, const char *type, }; int retval = EX_FAIL; - if (!nfs_parse_devname(&mi)) - return retval; - mi.options = po_split(*extra_opts); if (mi.options) { retval = nfsmount_start(&mi); @@ -790,6 +1049,7 @@ int nfsmount_string(const char *spec, const char *node, const char *type, } else nfs_error(_("%s: internal option parsing error"), progname); + freeaddrinfo(mi.address); free(mi.hostname); return retval; }