/* $NetBSD: opts.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ /* * Copyright (c) 1997-2014 Erez Zadok * Copyright (c) 1989 Jan-Simon Pendry * Copyright (c) 1989 Imperial College of Science, Technology & Medicine * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * * File: am-utils/amd/opts.c * */ #ifdef HAVE_CONFIG_H # include <config.h> #endif /* HAVE_CONFIG_H */ #include <am_defs.h> #include <amd.h> /* * MACROS: */ #define NLEN 16 /* Length of longest option name (conservative) */ #define S(x) (x) , (sizeof(x)-1) /* * The BUFSPACE macros checks that there is enough space * left in the expansion buffer. If there isn't then we * give up completely. This is done to avoid crashing the * automounter itself (which would be a bad thing to do). */ #define BUFSPACE(ep, len) (((ep) + (len)) < expbuf+MAXPATHLEN) /* * TYPEDEFS: */ typedef int (*IntFuncPtr) (char *); typedef struct opt_apply opt_apply; enum vs_opt { SelEQ, SelNE, VarAss }; /* * STRUCTURES */ struct opt { char *name; /* Name of the option */ int nlen; /* Length of option name */ char **optp; /* Pointer to option value string */ char **sel_p; /* Pointer to selector value string */ int (*fxn_p)(char *); /* Pointer to boolean function */ int case_insensitive; /* How to do selector comparisons */ }; struct opt_apply { char **opt; char *val; }; struct functable { char *name; IntFuncPtr func; }; /* * FORWARD DEFINITION: */ static int f_in_network(char *); static int f_xhost(char *); static int f_netgrp(char *); static int f_netgrpd(char *); static int f_exists(char *); static int f_false(char *); static int f_true(char *); static inline char *expand_options(char *key); /* * STATICS: */ static char NullStr[] = "<NULL>"; static char nullstr[] = ""; static char *opt_dkey = NullStr; static char *opt_host = nullstr; /* XXX: was the global hostname */ static char *opt_hostd = hostd; static char *opt_key = nullstr; static char *opt_keyd = nullstr; static char *opt_map = nullstr; static char *opt_path = nullstr; char uid_str[SIZEOF_UID_STR], gid_str[SIZEOF_GID_STR]; char *opt_uid = uid_str; char *opt_gid = gid_str; static char *vars[8]; static char *literal_dollar = "$"; /* ${dollar}: a literal '$' in maps */ /* * GLOBALS */ static struct am_opts fs_static; /* copy of the options to play with */ /* * Options in some order corresponding to frequency of use so that * first-match algorithm is sped up. */ static struct opt opt_fields[] = { /* Name and length. Option str. Selector str. boolean fxn. case sensitive */ { S("opts"), &fs_static.opt_opts, 0, 0, FALSE }, { S("host"), 0, &opt_host, 0, TRUE }, { S("hostd"), 0, &opt_hostd, 0, TRUE }, { S("type"), &fs_static.opt_type, 0, 0, FALSE }, { S("rhost"), &fs_static.opt_rhost, 0, 0, TRUE }, { S("rfs"), &fs_static.opt_rfs, 0, 0, FALSE }, { S("fs"), &fs_static.opt_fs, 0, 0, FALSE }, { S("key"), 0, &opt_key, 0, FALSE }, { S("map"), 0, &opt_map, 0, FALSE }, { S("sublink"), &fs_static.opt_sublink, 0, 0, FALSE }, { S("arch"), 0, &gopt.arch, 0, TRUE }, { S("dev"), &fs_static.opt_dev, 0, 0, FALSE }, { S("pref"), &fs_static.opt_pref, 0, 0, FALSE }, { S("path"), 0, &opt_path, 0, FALSE }, { S("autodir"), 0, &gopt.auto_dir, 0, FALSE }, { S("delay"), &fs_static.opt_delay, 0, 0, FALSE }, { S("domain"), 0, &hostdomain, 0, TRUE }, { S("karch"), 0, &gopt.karch, 0, TRUE }, { S("cluster"), 0, &gopt.cluster, 0, TRUE }, { S("wire"), 0, 0, f_in_network, TRUE }, { S("network"), 0, 0, f_in_network, TRUE }, { S("netnumber"), 0, 0, f_in_network, TRUE }, { S("byte"), 0, &endian, 0, TRUE }, { S("os"), 0, &gopt.op_sys, 0, TRUE }, { S("osver"), 0, &gopt.op_sys_ver, 0, TRUE }, { S("full_os"), 0, &gopt.op_sys_full, 0, TRUE }, { S("vendor"), 0, &gopt.op_sys_vendor, 0, TRUE }, { S("remopts"), &fs_static.opt_remopts, 0, 0, FALSE }, { S("mount"), &fs_static.opt_mount, 0, 0, FALSE }, { S("unmount"), &fs_static.opt_unmount, 0, 0, FALSE }, { S("umount"), &fs_static.opt_umount, 0, 0, FALSE }, { S("cache"), &fs_static.opt_cache, 0, 0, FALSE }, { S("user"), &fs_static.opt_user, 0, 0, FALSE }, { S("group"), &fs_static.opt_group, 0, 0, FALSE }, { S(".key"), 0, &opt_dkey, 0, FALSE }, { S("key."), 0, &opt_keyd, 0, FALSE }, { S("maptype"), &fs_static.opt_maptype, 0, 0, FALSE }, { S("cachedir"), &fs_static.opt_cachedir, 0, 0, FALSE }, { S("addopts"), &fs_static.opt_addopts, 0, 0, FALSE }, { S("uid"), 0, &opt_uid, 0, FALSE }, { S("gid"), 0, &opt_gid, 0, FALSE }, { S("mount_type"), &fs_static.opt_mount_type, 0, 0, FALSE }, { S("dollar"), &literal_dollar, 0, 0, FALSE }, { S("var0"), &vars[0], 0, 0, FALSE }, { S("var1"), &vars[1], 0, 0, FALSE }, { S("var2"), &vars[2], 0, 0, FALSE }, { S("var3"), &vars[3], 0, 0, FALSE }, { S("var4"), &vars[4], 0, 0, FALSE }, { S("var5"), &vars[5], 0, 0, FALSE }, { S("var6"), &vars[6], 0, 0, FALSE }, { S("var7"), &vars[7], 0, 0, FALSE }, { 0, 0, 0, 0, 0, FALSE }, }; static struct functable functable[] = { { "in_network", f_in_network }, { "xhost", f_xhost }, { "netgrp", f_netgrp }, { "netgrpd", f_netgrpd }, { "exists", f_exists }, { "false", f_false }, { "true", f_true }, { 0, 0 }, }; /* * Specially expand the remote host name first */ static opt_apply rhost_expansion[] = { {&fs_static.opt_rhost, "${host}"}, {0, 0}, }; /* * List of options which need to be expanded * Note that the order here _may_ be important. */ static opt_apply expansions[] = { {&fs_static.opt_sublink, 0}, {&fs_static.opt_rfs, "${path}"}, {&fs_static.opt_fs, "${autodir}/${rhost}${rfs}"}, {&fs_static.opt_opts, "rw"}, {&fs_static.opt_remopts, "${opts}"}, {&fs_static.opt_mount, 0}, {&fs_static.opt_unmount, 0}, {&fs_static.opt_umount, 0}, {&fs_static.opt_cachedir, 0}, {&fs_static.opt_addopts, 0}, {0, 0}, }; /* * List of options which need to be free'ed before re-use */ static opt_apply to_free[] = { {&fs_static.fs_glob, 0}, {&fs_static.fs_local, 0}, {&fs_static.fs_mtab, 0}, {&fs_static.opt_sublink, 0}, {&fs_static.opt_rfs, 0}, {&fs_static.opt_fs, 0}, {&fs_static.opt_rhost, 0}, {&fs_static.opt_opts, 0}, {&fs_static.opt_remopts, 0}, {&fs_static.opt_mount, 0}, {&fs_static.opt_unmount, 0}, {&fs_static.opt_umount, 0}, {&fs_static.opt_cachedir, 0}, {&fs_static.opt_addopts, 0}, {&vars[0], 0}, {&vars[1], 0}, {&vars[2], 0}, {&vars[3], 0}, {&vars[4], 0}, {&vars[5], 0}, {&vars[6], 0}, {&vars[7], 0}, {0, 0}, }; /* * expand backslash escape sequences * (escaped slash is handled separately in normalize_slash) */ static char backslash(char **p) { char c; if ((*p)[1] == '\0') { plog(XLOG_USER, "Empty backslash escape"); return **p; } if (**p == '\\') { (*p)++; switch (**p) { case 'g': c = '\007'; /* Bell */ break; case 'b': c = '\010'; /* Backspace */ break; case 't': c = '\011'; /* Horizontal Tab */ break; case 'n': c = '\012'; /* New Line */ break; case 'v': c = '\013'; /* Vertical Tab */ break; case 'f': c = '\014'; /* Form Feed */ break; case 'r': c = '\015'; /* Carriage Return */ break; case 'e': c = '\033'; /* Escape */ break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': { int cnt, val, ch; for (cnt = 0, val = 0; cnt < 3; cnt++) { ch = *(*p)++; if (ch < '0' || ch > '7') { (*p)--; break; } val = (val << 3) | (ch - '0'); } if ((val & 0xffffff00) != 0) plog(XLOG_USER, "Too large character constant %u\n", val); c = (char) val; --(*p); } break; default: c = **p; break; } } else c = **p; return c; } /* * Skip to next option in the string */ static char * opt(char **p) { char *cp = *p; char *dp = cp; char *s = cp; top: while (*cp && *cp != ';') { if (*cp == '"') { /* * Skip past string */ for (cp++; *cp && *cp != '"'; cp++) if (*cp == '\\') *dp++ = backslash(&cp); else *dp++ = *cp; if (*cp) cp++; } else { *dp++ = *cp++; } } /* * Skip past any remaining ';'s */ while (*cp == ';') cp++; /* * If we have a zero length string * and there are more fields, then * parse the next one. This allows * sequences of empty fields. */ if (*cp && dp == s) goto top; *dp = '\0'; *p = cp; return s; } /* * These routines add a new style of selector; function-style boolean * operators. To add new ones, just define functions as in true, false, * exists (below) and add them to the functable, above. * * Usage example: Some people have X11R5 local, some go to a server. I do * this: * * * exists(/usr/pkg/${key});type:=link;fs:=/usr/pkg/${key} || \ * -type:=nfs;rfs=/usr/pkg/${key} \ * rhost:=server1 \ * rhost:=server2 * * -Rens Troost <rens@imsi.com> */ static IntFuncPtr functable_lookup(char *key) { struct functable *fp; for (fp = functable; fp->name; fp++) if (FSTREQ(fp->name, key)) return (fp->func); return (IntFuncPtr) NULL; } /* * Fill in the global structure fs_static by * cracking the string opts. opts may be * scribbled on at will. Does NOT evaluate options. * Returns 0 on error, 1 if no syntax errors were discovered. */ static int split_opts(char *opts, char *mapkey) { char *o = opts; char *f; /* * For each user-specified option */ for (f = opt(&o); *f; f = opt(&o)) { struct opt *op; char *eq = strchr(f, '='); char *opt = NULL; if (!eq) continue; if (*(eq-1) == '!' || eq[1] == '=' || eq[1] == '!') { /* != or == or =! */ continue; /* we don't care about selectors */ } if (*(eq-1) == ':') { /* := */ *(eq-1) = '\0'; } else { /* old style assignment */ eq[0] = '\0'; } opt = eq + 1; /* * For each recognized option */ for (op = opt_fields; op->name; op++) { /* * Check whether they match */ if (FSTREQ(op->name, f)) { if (op->sel_p) { plog(XLOG_USER, "key %s: Can't assign to a selector (%s)", mapkey, op->name); return 0; } *op->optp = opt; /* actual assignment into fs_static */ break; /* break out of for loop */ } /* end of "if (FSTREQ(op->name, f))" statement */ } /* end of "for (op = opt_fields..." statement */ if (!op->name) plog(XLOG_USER, "key %s: Unrecognized key/option \"%s\"", mapkey, f); } return 1; } /* * Just evaluate selectors, which were split by split_opts. * Returns 0 on error or no match, 1 if matched. */ static int eval_selectors(char *opts, char *mapkey) { char *o, *old_o; char *f; int ret = 0; o = old_o = xstrdup(opts); /* * For each user-specified option */ for (f = opt(&o); *f; f = opt(&o)) { struct opt *op; enum vs_opt vs_opt; char *eq = strchr(f, '='); char *fx; IntFuncPtr func; char *opt = NULL; char *arg; if (!eq) { /* * No value, is it a function call? */ arg = strchr(f, '('); if (!arg || arg[1] == '\0' || arg == f) { /* * No, just continue */ plog(XLOG_USER, "key %s: No value component in \"%s\"", mapkey, f); continue; } /* null-terminate the argument */ *arg++ = '\0'; fx = strchr(arg, ')'); if (fx == NULL || fx == arg) { plog(XLOG_USER, "key %s: Malformed function in \"%s\"", mapkey, f); continue; } *fx = '\0'; if (f[0] == '!') { vs_opt = SelNE; f++; } else { vs_opt = SelEQ; } /* * look up f in functable and pass it arg. * func must return 0 on failure, and 1 on success. */ if ((func = functable_lookup(f))) { int funok; /* this allocates memory, don't forget to free */ arg = expand_options(arg); funok = func(arg); XFREE(arg); if (vs_opt == SelNE) funok = !funok; if (!funok) goto out; continue; } else { plog(XLOG_USER, "key %s: unknown function \"%s\"", mapkey, f); goto out; } } else { if (eq[1] == '\0' || eq == f) { #ifdef notdef /* We allow empty assignments */ plog(XLOG_USER, "key %s: Bad selector \"%s\"", mapkey, f); #endif continue; } } /* * Check what type of operation is happening * !=, =! is SelNE * == is SelEQ * =, := is VarAss */ if (*(eq-1) == '!') { /* != */ vs_opt = SelNE; *(eq-1) = '\0'; opt = eq + 1; } else if (*(eq-1) == ':') { /* := */ continue; } else if (eq[1] == '=') { /* == */ vs_opt = SelEQ; eq[0] = '\0'; opt = eq + 2; } else if (eq[1] == '!') { /* =! */ vs_opt = SelNE; eq[0] = '\0'; opt = eq + 2; } else { /* old style assignment */ continue; } /* * For each recognized option */ for (op = opt_fields; op->name; op++) { /* * Check whether they match */ if (FSTREQ(op->name, f)) { opt = expand_options(opt); if (op->sel_p != NULL) { int selok; if (op->case_insensitive) { selok = STRCEQ(*op->sel_p, opt); } else { selok = STREQ(*op->sel_p, opt); } if (vs_opt == SelNE) selok = !selok; if (!selok) { plog(XLOG_MAP, "key %s: map selector %s (=%s) did not %smatch %s", mapkey, op->name, *op->sel_p, vs_opt == SelNE ? "mis" : "", opt); XFREE(opt); goto out; } XFREE(opt); } /* check if to apply a function */ if (op->fxn_p) { int funok; funok = op->fxn_p(opt); if (vs_opt == SelNE) funok = !funok; if (!funok) { plog(XLOG_MAP, "key %s: map function %s did not %smatch %s", mapkey, op->name, vs_opt == SelNE ? "mis" : "", opt); XFREE(opt); goto out; } XFREE(opt); } break; /* break out of for loop */ } } if (!op->name) plog(XLOG_USER, "key %s: Unrecognized key/option \"%s\"", mapkey, f); } /* all is ok */ ret = 1; out: free(old_o); return ret; } /* * Skip to next option in the string, but don't scribble over the string. * However, *p gets repointed to the start of the next string past ';'. */ static char * opt_no_scribble(char **p) { char *cp = *p; char *dp = cp; char *s = cp; top: while (*cp && *cp != ';') { if (*cp == '\"') { /* * Skip past string */ cp++; while (*cp && *cp != '\"') *dp++ = *cp++; if (*cp) cp++; } else { *dp++ = *cp++; } } /* * Skip past any remaining ';'s */ while (*cp == ';') cp++; /* * If we have a zero length string * and there are more fields, then * parse the next one. This allows * sequences of empty fields. */ if (*cp && dp == s) goto top; *p = cp; return s; } /* * Strip any selectors from a string. Selectors are all assumed to be * first in the string. This is used for the new /defaults method which will * use selectors as well. */ char * strip_selectors(char *opts, char *mapkey) { /* * Fill in the global structure fs_static by * cracking the string opts. opts may be * scribbled on at will. */ char *o = opts; char *oo = opts; char *f; /* * Scan options. Note that the opt() function scribbles on the opt string. */ while (*(f = opt_no_scribble(&o))) { enum vs_opt vs_opt = VarAss; char *eq = strchr(f, '='); if (!eq || eq[1] == '\0' || eq == f) { /* * No option or assignment? Return as is. */ plog(XLOG_USER, "key %s: No option or assignment in \"%s\"", mapkey, f); return o; } /* * Check what type of operation is happening * !=, =! is SelNE * == is SelEQ * := is VarAss */ if (*(eq-1) == '!') { /* != */ vs_opt = SelNE; } else if (*(eq-1) == ':') { /* := */ vs_opt = VarAss; } else if (eq[1] == '=') { /* == */ vs_opt = SelEQ; } else if (eq[1] == '!') { /* =! */ vs_opt = SelNE; } switch (vs_opt) { case SelEQ: case SelNE: /* Skip this selector, maybe there's another one following it */ plog(XLOG_USER, "skipping selector to \"%s\"", o); /* store previous match. it may have been the first assignment */ oo = o; break; case VarAss: /* found the first assignment, return the string starting with it */ dlog("found first assignment past selectors \"%s\"", o); return oo; } } /* return the same string by default. should not happen. */ return oo; } /***************************************************************************** *** BOOLEAN FUNCTIONS (return 0 if false, 1 if true): *** *****************************************************************************/ /* test if arg is any of this host's network names or numbers */ static int f_in_network(char *arg) { int status; if (!arg) return 0; status = is_network_member(arg); dlog("%s is %son a local network", arg, (status ? "" : "not ")); return status; } /* * Test if arg is any of this host's names or aliases (CNAMES). * Note: this function compares against the fully expanded host name (hostd). * XXX: maybe we also need to compare against the stripped host name? */ static int f_xhost(char *arg) { struct hostent *hp; char **cp; if (!arg) return 0; /* simple test: does it match main host name? */ if (STREQ(arg, opt_hostd)) return 1; /* now find all of the names of "arg" and compare against opt_hostd */ hp = gethostbyname(arg); if (hp == NULL) { #ifdef HAVE_HSTRERROR plog(XLOG_ERROR, "gethostbyname xhost(%s): %s", arg, hstrerror(h_errno)); #else /* not HAVE_HSTRERROR */ plog(XLOG_ERROR, "gethostbyname xhost(%s): h_errno %d", arg, h_errno); #endif /* not HAVE_HSTRERROR */ return 0; } /* check primary name */ if (hp->h_name) { dlog("xhost: compare %s==%s", hp->h_name, opt_hostd); if (STREQ(hp->h_name, opt_hostd)) { plog(XLOG_INFO, "xhost(%s): matched h_name %s", arg, hp->h_name); return 1; } } /* check all aliases, if any */ if (hp->h_aliases == NULL) { dlog("gethostbyname(%s) has no aliases", arg); return 0; } cp = hp->h_aliases; while (*cp) { dlog("xhost: compare alias %s==%s", *cp, opt_hostd); if (STREQ(*cp, opt_hostd)) { plog(XLOG_INFO, "xhost(%s): matched alias %s", arg, *cp); return 1; } cp++; } /* nothing matched */ return 0; } /* test if this host (short hostname form) is in netgroup (arg) */ static int f_netgrp(char *arg) { int status; char *ptr, *nhost; if ((ptr = strchr(arg, ',')) != NULL) { *ptr = '\0'; nhost = ptr + 1; } else { nhost = opt_host; } status = innetgr(arg, nhost, NULL, NULL); dlog("netgrp = %s status = %d host = %s", arg, status, nhost); if (ptr) *ptr = ','; return status; } /* test if this host (fully-qualified name) is in netgroup (arg) */ static int f_netgrpd(char *arg) { int status; char *ptr, *nhost; if ((ptr = strchr(arg, ',')) != NULL) { *ptr = '\0'; nhost = ptr + 1; } else { nhost = opt_hostd; } status = innetgr(arg, nhost, NULL, NULL); dlog("netgrp = %s status = %d hostd = %s", arg, status, nhost); if (ptr) *ptr = ','; return status; } /* test if file (arg) exists via lstat */ static int f_exists(char *arg) { struct stat buf; if (lstat(arg, &buf) < 0) return (0); else return (1); } /* always false */ static int f_false(char *arg) { return (0); } /* always true */ static int f_true(char *arg) { return (1); } /* * Free an option */ static void free_op(opt_apply *p, int b) { XFREE(*p->opt); } /* * Normalize slashes in the string. */ void normalize_slash(char *p) { char *f, *f0; if (!(gopt.flags & CFM_NORMALIZE_SLASHES)) return; f0 = f = strchr(p, '/'); if (f) { char *t = f; do { /* assert(*f == '/'); */ if (f == f0 && f[0] == '/' && f[1] == '/') { /* copy double slash iff first */ *t++ = *f++; *t++ = *f++; } else { /* copy a single / across */ *t++ = *f++; } /* assert(f[-1] == '/'); */ /* skip past more /'s */ while (*f == '/') f++; /* assert(*f != '/'); */ /* keep copying up to next / */ while (*f && *f != '/') { /* support escaped slashes '\/' */ if (f[0] == '\\' && f[1] == '/') f++; /* skip backslash */ *t++ = *f++; } /* assert(*f == 0 || *f == '/'); */ } while (*f); *t = '\0'; /* derived from fix by Steven Glassman */ } } /* * Macro-expand an option. Note that this does not * handle recursive expansions. They will go badly wrong. * If sel_p is true then old expand selectors, otherwise * don't expand selectors. */ static char * expand_op(char *opt, int sel_p) { #define EXPAND_ERROR "No space to expand \"%s\"" char expbuf[MAXPATHLEN + 1]; char nbuf[NLEN + 1]; char *ep = expbuf; char *cp = opt; char *dp; struct opt *op; char *cp_orig = opt; while ((dp = strchr(cp, '$'))) { char ch; /* * First copy up to the $ */ { int len = dp - cp; if (len > 0) { if (BUFSPACE(ep, len)) { /* * We use strncpy (not xstrlcpy) because 'ep' relies on its * semantics. BUFSPACE guarantees that ep can hold len. */ strncpy(ep, cp, len); ep += len; } else { plog(XLOG_ERROR, EXPAND_ERROR, opt); goto out; } } } cp = dp + 1; ch = *cp++; if (ch == '$') { if (BUFSPACE(ep, 1)) { *ep++ = '$'; } else { plog(XLOG_ERROR, EXPAND_ERROR, opt); goto out; } } else if (ch == '{') { /* Expansion... */ enum { E_All, E_Dir, E_File, E_Domain, E_Host } todo; /* * Find closing brace */ char *br_p = strchr(cp, '}'); int len; /* * Check we found it */ if (!br_p) { /* * Just give up */ plog(XLOG_USER, "No closing '}' in \"%s\"", opt); goto out; } len = br_p - cp; /* * Figure out which part of the variable to grab. */ if (*cp == '/') { /* * Just take the last component */ todo = E_File; cp++; --len; } else if (*(br_p-1) == '/') { /* * Take all but the last component */ todo = E_Dir; --len; } else if (*cp == '.') { /* * Take domain name */ todo = E_Domain; cp++; --len; } else if (*(br_p-1) == '.') { /* * Take host name */ todo = E_Host; --len; } else { /* * Take the whole lot */ todo = E_All; } /* * Truncate if too long. Since it won't * match anyway it doesn't matter that * it has been cut short. */ if (len > NLEN) len = NLEN; /* * Put the string into another buffer so * we can do comparisons. * * We use strncpy here (not xstrlcpy) because the dest is meant * to be truncated and we don't want to log it as an error. The * use of the BUFSPACE macro above guarantees the safe use of * strncpy with nbuf. */ strncpy(nbuf, cp, len); nbuf[len] = '\0'; /* * Advance cp */ cp = br_p + 1; /* * Search the option array */ for (op = opt_fields; op->name; op++) { /* * Check for match */ if (len == op->nlen && STREQ(op->name, nbuf)) { char xbuf[NLEN + 3]; char *val; /* * Found expansion. Copy * the correct value field. */ if (!(!op->sel_p == !sel_p)) { /* * Copy the string across unexpanded */ xsnprintf(xbuf, sizeof(xbuf), "${%s%s%s}", todo == E_File ? "/" : todo == E_Domain ? "." : "", nbuf, todo == E_Dir ? "/" : todo == E_Host ? "." : ""); val = xbuf; /* * Make sure expansion doesn't * munge the value! */ todo = E_All; } else if (op->sel_p) { val = *op->sel_p; } else { val = *op->optp; } if (val) { /* * Do expansion: * ${/var} means take just the last part * ${var/} means take all but the last part * ${.var} means take all but first part * ${var.} means take just the first part * ${var} means take the whole lot */ int vlen = strlen(val); char *vptr = val; switch (todo) { case E_Dir: vptr = strrchr(val, '/'); if (vptr) vlen = vptr - val; vptr = val; break; case E_File: vptr = strrchr(val, '/'); if (vptr) { vptr++; vlen = strlen(vptr); } else vptr = val; break; case E_Domain: vptr = strchr(val, '.'); if (vptr) { vptr++; vlen = strlen(vptr); } else { vptr = ""; vlen = 0; } break; case E_Host: vptr = strchr(val, '.'); if (vptr) vlen = vptr - val; vptr = val; break; case E_All: break; } if (BUFSPACE(ep, vlen+1)) { /* * Don't call xstrlcpy() to truncate a string here. It causes * spurious xstrlcpy() syslog() errors. Use memcpy() and * explicitly terminate the string. */ memcpy(ep, vptr, vlen+1); ep += vlen; *ep = '\0'; } else { plog(XLOG_ERROR, EXPAND_ERROR, opt); goto out; } } /* * Done with this variable */ break; } } /* * Check that the search was successful */ if (!op->name) { /* * If it wasn't then scan the * environment for that name * and use any value found */ char *env = getenv(nbuf); if (env) { int vlen = strlen(env); if (BUFSPACE(ep, vlen+1)) { xstrlcpy(ep, env, vlen+1); ep += vlen; } else { plog(XLOG_ERROR, EXPAND_ERROR, opt); goto out; } if (amuDebug(D_STR)) plog(XLOG_DEBUG, "Environment gave \"%s\" -> \"%s\"", nbuf, env); } else { plog(XLOG_USER, "Unknown sequence \"${%s}\"", nbuf); } } } else { /* * Error, error */ plog(XLOG_USER, "Unknown $ sequence in \"%s\"", opt); } } out: /* * Handle common case - no expansion */ if (cp == opt) { opt = xstrdup(cp); } else { /* * Finish off the expansion */ int vlen = strlen(cp); if (BUFSPACE(ep, vlen+1)) { xstrlcpy(ep, cp, vlen+1); /* ep += vlen; */ } else { plog(XLOG_ERROR, EXPAND_ERROR, opt); } /* * Save the expansion */ opt = xstrdup(expbuf); } normalize_slash(opt); if (amuDebug(D_STR)) { plog(XLOG_DEBUG, "Expansion of \"%s\"...", cp_orig); plog(XLOG_DEBUG, "......... is \"%s\"", opt); } return opt; } /* * Wrapper for expand_op */ static void expand_opts(opt_apply *p, int sel_p) { if (*p->opt) { *p->opt = expand_op(*p->opt, sel_p); } else if (p->val) { /* * Do double expansion, remembering * to free the string from the first * expansion... */ char *s = expand_op(p->val, TRUE); *p->opt = expand_op(s, sel_p); XFREE(s); } } /* * Apply a function to a list of options */ static void apply_opts(void (*op) (opt_apply *, int), opt_apply ppp[], int b) { opt_apply *pp; for (pp = ppp; pp->opt; pp++) (*op) (pp, b); } /* * Free the option table */ void free_opts(am_opts *fo) { /* * Copy in the structure we are playing with */ fs_static = *fo; /* * Free previously allocated memory */ apply_opts(free_op, to_free, FALSE); } am_opts * copy_opts(am_opts *old) { am_opts *newopts; newopts = CALLOC(struct am_opts); #define _AM_OPT_COPY(field) do { \ if (old->field) \ newopts->field = xstrdup(old->field); \ } while (0) _AM_OPT_COPY(fs_glob); _AM_OPT_COPY(fs_local); _AM_OPT_COPY(fs_mtab); _AM_OPT_COPY(opt_dev); _AM_OPT_COPY(opt_delay); _AM_OPT_COPY(opt_dir); _AM_OPT_COPY(opt_fs); _AM_OPT_COPY(opt_group); _AM_OPT_COPY(opt_mount); _AM_OPT_COPY(opt_opts); _AM_OPT_COPY(opt_remopts); _AM_OPT_COPY(opt_pref); _AM_OPT_COPY(opt_cache); _AM_OPT_COPY(opt_rfs); _AM_OPT_COPY(opt_rhost); _AM_OPT_COPY(opt_sublink); _AM_OPT_COPY(opt_type); _AM_OPT_COPY(opt_mount_type); _AM_OPT_COPY(opt_unmount); _AM_OPT_COPY(opt_umount); _AM_OPT_COPY(opt_user); _AM_OPT_COPY(opt_maptype); _AM_OPT_COPY(opt_cachedir); _AM_OPT_COPY(opt_addopts); return newopts; } /* * Expand selectors (variables that cannot be assigned to or overridden) */ char * expand_selectors(char *key) { return expand_op(key, TRUE); } /* * Expand options (i.e. non-selectors, see above for definition) */ static inline char * expand_options(char *key) { return expand_op(key, FALSE); } /* * Remove trailing /'s from a string * unless the string is a single / (Steven Glassman) * or unless it is two slashes // (Kevin D. Bond) * or unless amd.conf says not to touch slashes. */ void deslashify(char *s) { if (!(gopt.flags & CFM_NORMALIZE_SLASHES)) return; if (s && *s) { char *sl = s + strlen(s); while (*--sl == '/' && sl > s) *sl = '\0'; } } int eval_fs_opts(am_opts *fo, char *opts, char *g_opts, char *path, char *key, char *map) { int ok = TRUE; free_opts(fo); /* * Clear out the option table */ memset((voidp) &fs_static, 0, sizeof(fs_static)); memset((voidp) vars, 0, sizeof(vars)); memset((voidp) fo, 0, sizeof(*fo)); /* set hostname */ opt_host = (char *) am_get_hostname(); /* * Set key, map & path before expansion */ opt_key = key; opt_map = map; opt_path = path; opt_dkey = strchr(key, '.'); if (!opt_dkey) { opt_dkey = NullStr; opt_keyd = key; } else { opt_keyd = strnsave(key, opt_dkey - key); opt_dkey++; if (*opt_dkey == '\0') /* check for 'host.' */ opt_dkey = NullStr; } /* * Expand global options */ fs_static.fs_glob = expand_selectors(g_opts); /* * Expand local options */ fs_static.fs_local = expand_selectors(opts); /* break global options into fs_static fields */ if ((ok = split_opts(fs_static.fs_glob, key))) { dlog("global split_opts ok"); /* * evaluate local selectors */ if ((ok = eval_selectors(fs_static.fs_local, key))) { dlog("local eval_selectors ok"); /* if the local selectors matched, then do the local overrides */ ok = split_opts(fs_static.fs_local, key); if (ok) dlog("local split_opts ok"); } } /* * Normalize remote host name. * 1. Expand variables * 2. Normalize relative to host tables * 3. Strip local domains from the remote host * name before using it in other expansions. * This makes mount point names and other things * much shorter, while allowing cross domain * sharing of mount maps. */ apply_opts(expand_opts, rhost_expansion, FALSE); if (ok && fs_static.opt_rhost && *fs_static.opt_rhost) host_normalize(&fs_static.opt_rhost); /* * Macro expand the options. * Do this regardless of whether we are accepting * this mount - otherwise nasty things happen * with memory allocation. */ apply_opts(expand_opts, expansions, FALSE); /* * Strip trailing slashes from local pathname... */ deslashify(fs_static.opt_fs); /* * ok... copy the data back out. */ *fo = fs_static; /* * Clear defined options */ if (opt_keyd != key && opt_keyd != nullstr) XFREE(opt_keyd); opt_keyd = nullstr; opt_dkey = NullStr; opt_key = opt_map = opt_path = nullstr; return ok; }