diff options
Diffstat (limited to 'support/nfs/exports.c')
| -rw-r--r-- | support/nfs/exports.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/support/nfs/exports.c b/support/nfs/exports.c new file mode 100644 index 0000000..21b85be --- /dev/null +++ b/support/nfs/exports.c @@ -0,0 +1,440 @@ +/* + * support/nfs/export.c + * + * Parse the exports file. Derived from the unfsd implementation. + * + * Authors: Donald J. Becker, <becker@super.org> + * Rick Sladkey, <jrs@world.std.com> + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * Olaf Kirch, <okir@monad.swb.de> + * Alexander O. Yuriev, <alex@bach.cis.temple.edu> + * + * This software maybe be used for any purpose provided + * the above copyright notice is retained. It is supplied + * as is, with no warranty expressed or implied. + */ + +#include "config.h" + +#include <sys/param.h> +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <ctype.h> +#include <unistd.h> +#include "nfslib.h" +#include "exportfs.h" +#include "xmalloc.h" +#include "xlog.h" +#include "xio.h" + +#define EXPORT_DEFAULT_FLAGS \ + (NFSEXP_ASYNC|NFSEXP_READONLY|NFSEXP_ROOTSQUASH|NFSEXP_GATHERED_WRITES) + +static XFILE *efp = NULL; +static int first; +static int *squids = NULL, nsquids = 0, + *sqgids = NULL, nsqgids = 0; + +static int getexport(char *exp, int len); +static int getpath(char *path, int len); +static int parseopts(char *cp, struct exportent *ep); +static int parsesquash(char *list, int **idp, int *lenp, char **ep); +static int parsenum(char **cpp); +static int parsemaptype(char *type); +static void freesquash(void); +static void syntaxerr(char *msg); + +void +setexportent(char *fname, char *type) +{ + if (efp) + endexportent(); + if (!fname) + fname = _PATH_EXPORTS; + if (!(efp = xfopen(fname, type))) + xlog(L_ERROR, "can't open %s for %sing", + fname, strcmp(type, "r")? "writ" : "read"); + first = 1; +} + +struct exportent * +getexportent(void) +{ + static struct exportent ee; + char exp[512]; + char rpath[MAXPATHLEN+1]; + char *opt, *sp; + int ok; + + if (!efp) + return NULL; + + freesquash(); + ee.e_flags = EXPORT_DEFAULT_FLAGS; + ee.e_maptype = CLE_MAP_IDENT; + ee.e_anonuid = -2; + ee.e_anongid = -2; + ee.e_squids = NULL; + ee.e_sqgids = NULL; + ee.e_nsquids = 0; + ee.e_nsqgids = 0; + + if (first || (ok = getexport(exp, sizeof(exp))) == 0) { + ok = getpath(ee.e_path, sizeof(ee.e_path)); + if (ok <= 0) + return NULL; + strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1); + ee.m_path [sizeof (ee.m_path) - 1] = '\0'; + ok = getexport(exp, sizeof(exp)); + } + if (ok < 0) { + xlog(L_ERROR, "expected client(options...)"); + return NULL; + } + first = 0; + + /* Check for default client */ + if (ok == 0) + exp[0] = '\0'; + if ((opt = strchr(exp, '(')) != NULL) { + *opt++ = '\0'; + if (!(sp = strchr(opt, ')')) || sp[1] != '\0') { + syntaxerr("bad option list"); + return NULL; + } + *sp = '\0'; + if (parseopts(opt, &ee) < 0) + return NULL; + } + if (strlen(exp) >= sizeof(ee.e_hostname)) { + syntaxerr("client name too long"); + return NULL; + } + strncpy(ee.e_hostname, exp, sizeof (ee.e_hostname) - 1); + ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0'; + + /* resolve symlinks */ + if (realpath(ee.e_path, rpath) != NULL) { + rpath[sizeof (rpath) - 1] = '\0'; + strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1); + ee.e_path[sizeof (ee.e_path) - 1] = '\0'; + strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1); + ee.m_path [sizeof (ee.m_path) - 1] = '\0'; + } + + return ⅇ +} + +void +putexportent(struct exportent *ep) +{ + FILE *fp; + int *id, i; + + if (!efp) + return; + + fp = efp->x_fp; + fprintf(fp, "%s\t%s(", ep->e_path, ep->e_hostname); + fprintf(fp, "%s,", (ep->e_flags & NFSEXP_READONLY)? "ro" : "rw"); + fprintf(fp, "%ssync,", (ep->e_flags & NFSEXP_ASYNC)? "a" : ""); + fprintf(fp, "%swdelay,", (ep->e_flags & NFSEXP_GATHERED_WRITES)? + "" : "no_"); + fprintf(fp, "%ssecure,", (ep->e_flags & NFSEXP_INSECURE_PORT)? + "in" : ""); + fprintf(fp, "%sroot_squash,", (ep->e_flags & NFSEXP_ROOTSQUASH)? + "" : "no_"); + fprintf(fp, "%sall_squash,", (ep->e_flags & NFSEXP_ALLSQUASH)? + "" : "no_"); + + fprintf(fp, "mapping="); + switch (ep->e_maptype) { + case CLE_MAP_IDENT: + fprintf(fp, "identity,"); + break; + case CLE_MAP_UGIDD: + fprintf(fp, "ugidd,"); + break; + case CLE_MAP_FILE: + fprintf(fp, "file,"); + break; + default: + xlog(L_ERROR, "unknown mapping type for %s:%s", + ep->e_hostname, ep->e_path); + } + if ((id = ep->e_squids) != NULL) { + fprintf(fp, "squash_uids="); + for (i = 0; i < ep->e_nsquids; i += 2) + if (id[i] != id[i+1]) + fprintf(fp, "%d-%d,", id[i], id[i+1]); + else + fprintf(fp, "%d,", id[i]); + } + if ((id = ep->e_sqgids) != NULL) { + fprintf(fp, "squash_gids="); + for (i = 0; i < ep->e_nsquids; i += 2) + if (id[i] != id[i+1]) + fprintf(fp, "%d-%d,", id[i], id[i+1]); + else + fprintf(fp, "%d,", id[i]); + } + fprintf(fp, "anonuid=%d,anongid=%d)\n", ep->e_anonuid, ep->e_anongid); +} + +void +endexportent(void) +{ + if (efp) + xfclose(efp); + efp = NULL; + freesquash(); +} + +void +dupexportent(struct exportent *dst, struct exportent *src) +{ + int n; + + *dst = *src; + if ((n = src->e_nsquids) != 0) { + dst->e_squids = (int *) xmalloc(n * sizeof(int)); + memcpy(dst->e_squids, src->e_squids, n * sizeof(int)); + } + if ((n = src->e_nsqgids) != 0) { + dst->e_sqgids = (int *) xmalloc(n * sizeof(int)); + memcpy(dst->e_sqgids, src->e_sqgids, n * sizeof(int)); + } +} + +struct exportent * +mkexportent(char *hname, char *path, char *options) +{ + static struct exportent ee; + + ee.e_flags = EXPORT_DEFAULT_FLAGS; + ee.e_maptype = CLE_MAP_IDENT; + ee.e_anonuid = -2; + ee.e_anongid = -2; + ee.e_squids = NULL; + ee.e_sqgids = NULL; + ee.e_nsquids = 0; + ee.e_nsqgids = 0; + + if (strlen(hname) >= sizeof(ee.e_hostname)) { + xlog(L_WARNING, "client name %s too long", hname); + return NULL; + } + strncpy(ee.e_hostname, hname, sizeof (ee.e_hostname) - 1); + ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0'; + if (strlen(path) >= sizeof(ee.e_path)) { + xlog(L_WARNING, "path name %s too long", path); + return NULL; + } + strncpy(ee.e_path, path, sizeof (ee.e_path)); + ee.e_path[sizeof (ee.e_path) - 1] = '\0'; + strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1); + ee.m_path [sizeof (ee.m_path) - 1] = '\0'; + if (options && parseopts(options, &ee) < 0) + return NULL; + return ⅇ +} + +int +updateexportent(struct exportent *eep, char *options) +{ + if (options && parseopts(options, eep) < 0) + return 0; + return 1; +} + +/* + * Parse option string pointed to by s and set mount options accordingly. + */ +static int +parseopts(char *cp, struct exportent *ep) +{ + char *opt; + + squids = ep->e_squids; nsquids = ep->e_nsquids; + sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids; + + while (isblank(*cp)) + cp++; + while (*cp) { + opt = cp; + while (*cp && *cp != ',') + cp++; + if (*cp) + *cp++ = '\0'; + + /* process keyword */ + if (strcmp(opt, "ro") == 0) + ep->e_flags |= NFSEXP_READONLY; + else if (strcmp(opt, "rw") == 0) + ep->e_flags &= ~NFSEXP_READONLY; + else if (!strcmp(opt, "secure")) + ep->e_flags &= ~NFSEXP_INSECURE_PORT; + else if (!strcmp(opt, "insecure")) + ep->e_flags |= NFSEXP_INSECURE_PORT; + else if (!strcmp(opt, "sync")) + ep->e_flags &= ~NFSEXP_ASYNC; + else if (!strcmp(opt, "async")) + ep->e_flags |= NFSEXP_ASYNC; + else if (!strcmp(opt, "wdelay")) + ep->e_flags |= NFSEXP_GATHERED_WRITES; + else if (!strcmp(opt, "no_wdelay")) + ep->e_flags &= ~NFSEXP_GATHERED_WRITES; + else if (strcmp(opt, "root_squash") == 0) + ep->e_flags |= NFSEXP_ROOTSQUASH; + else if (!strcmp(opt, "no_root_squash")) + ep->e_flags &= ~NFSEXP_ROOTSQUASH; + else if (strcmp(opt, "all_squash") == 0) + ep->e_flags |= NFSEXP_ALLSQUASH; + else if (strcmp(opt, "no_all_squash") == 0) + ep->e_flags &= ~NFSEXP_ALLSQUASH; + else if (strncmp(opt, "mapping=", 8) == 0) + ep->e_maptype = parsemaptype(opt+8); + else if (strcmp(opt, "map_identity") == 0) /* old style */ + ep->e_maptype = CLE_MAP_IDENT; + else if (strcmp(opt, "map_daemon") == 0) /* old style */ + ep->e_maptype = CLE_MAP_UGIDD; + else if (strncmp(opt, "anonuid=", 8) == 0) + ep->e_anonuid = atoi(opt+8); + else if (strncmp(opt, "anongid=", 8) == 0) + ep->e_anongid = atoi(opt+8); + else if (strncmp(opt, "squash_uids=", 12) == 0) { + if (parsesquash(opt+12, &squids, &nsquids, &cp) < 0) + return -1; + } else if (strncmp(opt, "squash_gids=", 12) == 0) { + if (parsesquash(opt+12, &sqgids, &nsqgids, &cp) < 0) + return -1; + } else { + xlog(L_ERROR, + "Unknown keyword \"%s\" in export file\n", + opt); + ep->e_flags |= NFSEXP_ALLSQUASH | NFSEXP_READONLY; + return -1; + } + while (isblank(*cp)) + cp++; + } + + ep->e_squids = squids; + ep->e_sqgids = sqgids; + ep->e_nsquids = nsquids; + ep->e_nsqgids = nsqgids; + + return 1; +} + +static int +parsesquash(char *list, int **idp, int *lenp, char **ep) +{ + char *cp = list; + int id0, id1; + int len = *lenp; + int *id = *idp; + + if (**ep) + *--(*ep) = ','; + + do { + id0 = parsenum(&cp); + if (*cp == '-') { + cp++; + id1 = parsenum(&cp); + } else { + id1 = id0; + } + if (id0 == -1 || id1 == -1) { + syntaxerr("uid/gid -1 not permitted"); + return -1; + } + if ((len % 8) == 0) + id = (int *) xrealloc(id, (len + 8) * sizeof(*id)); + id[len++] = id0; + id[len++] = id1; + if (!*cp || *cp == ')' || (*cp == ',' && !isdigit(cp[1]))) + break; + if (*cp != ',') { + syntaxerr("bad uid/gid list"); + return -1; + } + cp++; + } while(1); + + if (*cp == ',') *ep = cp+1; + + *lenp = len; + *idp = id; + return 1; +} + +static void +freesquash(void) +{ + if (squids) { + xfree (squids); + squids = NULL; + nsquids = 0; + } + if (sqgids) { + xfree (sqgids); + sqgids = NULL; + nsqgids = 0; + } +} + +static int +parsenum(char **cpp) +{ + char *cp = *cpp, c; + int num = 0; + + if (**cpp == '-') + (*cpp)++; + while (isdigit(**cpp)) + (*cpp)++; + c = **cpp; **cpp = '\0'; num = atoi(cp); **cpp = c; + return num; +} + +static int +parsemaptype(char *type) +{ + if (!strcmp(type, "identity")) + return CLE_MAP_IDENT; + if (!strcmp(type, "ugidd")) + return CLE_MAP_UGIDD; + if (!strcmp(type, "file")) + return CLE_MAP_FILE; + syntaxerr("invalid map type"); + return CLE_MAP_IDENT; /* default */ +} + +static int +getpath(char *path, int len) +{ + xskip(efp, " \t\n"); + return xgettok(efp, 0, path, len); +} + +static int +getexport(char *exp, int len) +{ + int ok; + + xskip(efp, " \t"); + if ((ok = xgettok(efp, 0, exp, len)) < 0) + xlog(L_ERROR, "error parsing export entry"); + return ok; +} + +static void +syntaxerr(char *msg) +{ + xlog(L_ERROR, "syntax error in exports file (line %d): %s", + efp->x_line, msg); +} + |