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317181e8ea
Introduce an API for custom log handler functions. This allows libfuse applications to send messages to syslog(3) or other logging systems. See include/fuse_log.h for details. Convert libfuse from fprintf(stderr, ...) to log_fuse(level, ...). Most messages are error messages with FUSE_LOG_ERR log level. There are also some debug messages which now use the FUSE_LOG_DEBUG log level. Note that lib/mount_util.c is used by both libfuse and fusermount3. Since fusermount3 does not link against libfuse, we cannot call fuse_log() from lib/mount_util.c. This file will continue to use fprintf(stderr, ...) until someone figures out how to split it up. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
424 lines
8.7 KiB
C
424 lines
8.7 KiB
C
/*
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
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Implementation of option parsing routines (dealing with `struct
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fuse_args`).
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This program can be distributed under the terms of the GNU LGPLv2.
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See the file COPYING.LIB
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*/
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#include "config.h"
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#include "fuse_i.h"
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#include "fuse_opt.h"
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#include "fuse_misc.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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struct fuse_opt_context {
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void *data;
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const struct fuse_opt *opt;
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fuse_opt_proc_t proc;
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int argctr;
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int argc;
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char **argv;
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struct fuse_args outargs;
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char *opts;
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int nonopt;
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};
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void fuse_opt_free_args(struct fuse_args *args)
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{
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if (args) {
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if (args->argv && args->allocated) {
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int i;
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for (i = 0; i < args->argc; i++)
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free(args->argv[i]);
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free(args->argv);
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}
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args->argc = 0;
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args->argv = NULL;
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args->allocated = 0;
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}
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}
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static int alloc_failed(void)
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{
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fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n");
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return -1;
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}
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int fuse_opt_add_arg(struct fuse_args *args, const char *arg)
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{
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char **newargv;
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char *newarg;
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assert(!args->argv || args->allocated);
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newarg = strdup(arg);
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if (!newarg)
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return alloc_failed();
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newargv = realloc(args->argv, (args->argc + 2) * sizeof(char *));
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if (!newargv) {
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free(newarg);
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return alloc_failed();
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}
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args->argv = newargv;
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args->allocated = 1;
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args->argv[args->argc++] = newarg;
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args->argv[args->argc] = NULL;
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return 0;
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}
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static int fuse_opt_insert_arg_common(struct fuse_args *args, int pos,
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const char *arg)
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{
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assert(pos <= args->argc);
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if (fuse_opt_add_arg(args, arg) == -1)
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return -1;
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if (pos != args->argc - 1) {
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char *newarg = args->argv[args->argc - 1];
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memmove(&args->argv[pos + 1], &args->argv[pos],
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sizeof(char *) * (args->argc - pos - 1));
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args->argv[pos] = newarg;
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}
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return 0;
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}
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int fuse_opt_insert_arg(struct fuse_args *args, int pos, const char *arg)
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{
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return fuse_opt_insert_arg_common(args, pos, arg);
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}
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static int next_arg(struct fuse_opt_context *ctx, const char *opt)
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{
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if (ctx->argctr + 1 >= ctx->argc) {
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fuse_log(FUSE_LOG_ERR, "fuse: missing argument after `%s'\n", opt);
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return -1;
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}
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ctx->argctr++;
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return 0;
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}
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static int add_arg(struct fuse_opt_context *ctx, const char *arg)
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{
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return fuse_opt_add_arg(&ctx->outargs, arg);
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}
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static int add_opt_common(char **opts, const char *opt, int esc)
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{
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unsigned oldlen = *opts ? strlen(*opts) : 0;
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char *d = realloc(*opts, oldlen + 1 + strlen(opt) * 2 + 1);
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if (!d)
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return alloc_failed();
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*opts = d;
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if (oldlen) {
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d += oldlen;
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*d++ = ',';
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}
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for (; *opt; opt++) {
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if (esc && (*opt == ',' || *opt == '\\'))
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*d++ = '\\';
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*d++ = *opt;
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}
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*d = '\0';
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return 0;
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}
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int fuse_opt_add_opt(char **opts, const char *opt)
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{
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return add_opt_common(opts, opt, 0);
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}
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int fuse_opt_add_opt_escaped(char **opts, const char *opt)
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{
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return add_opt_common(opts, opt, 1);
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}
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static int add_opt(struct fuse_opt_context *ctx, const char *opt)
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{
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return add_opt_common(&ctx->opts, opt, 1);
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}
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static int call_proc(struct fuse_opt_context *ctx, const char *arg, int key,
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int iso)
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{
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if (key == FUSE_OPT_KEY_DISCARD)
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return 0;
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if (key != FUSE_OPT_KEY_KEEP && ctx->proc) {
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int res = ctx->proc(ctx->data, arg, key, &ctx->outargs);
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if (res == -1 || !res)
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return res;
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}
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if (iso)
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return add_opt(ctx, arg);
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else
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return add_arg(ctx, arg);
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}
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static int match_template(const char *t, const char *arg, unsigned *sepp)
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{
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int arglen = strlen(arg);
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const char *sep = strchr(t, '=');
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sep = sep ? sep : strchr(t, ' ');
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if (sep && (!sep[1] || sep[1] == '%')) {
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int tlen = sep - t;
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if (sep[0] == '=')
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tlen ++;
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if (arglen >= tlen && strncmp(arg, t, tlen) == 0) {
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*sepp = sep - t;
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return 1;
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}
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}
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if (strcmp(t, arg) == 0) {
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*sepp = 0;
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return 1;
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}
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return 0;
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}
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static const struct fuse_opt *find_opt(const struct fuse_opt *opt,
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const char *arg, unsigned *sepp)
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{
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for (; opt && opt->templ; opt++)
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if (match_template(opt->templ, arg, sepp))
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return opt;
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return NULL;
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}
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int fuse_opt_match(const struct fuse_opt *opts, const char *opt)
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{
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unsigned dummy;
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return find_opt(opts, opt, &dummy) ? 1 : 0;
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}
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static int process_opt_param(void *var, const char *format, const char *param,
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const char *arg)
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{
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assert(format[0] == '%');
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if (format[1] == 's') {
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char **s = var;
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char *copy = strdup(param);
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if (!copy)
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return alloc_failed();
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free(*s);
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*s = copy;
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} else {
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if (sscanf(param, format, var) != 1) {
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fuse_log(FUSE_LOG_ERR, "fuse: invalid parameter in option `%s'\n", arg);
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return -1;
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}
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}
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return 0;
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}
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static int process_opt(struct fuse_opt_context *ctx,
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const struct fuse_opt *opt, unsigned sep,
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const char *arg, int iso)
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{
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if (opt->offset == -1U) {
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if (call_proc(ctx, arg, opt->value, iso) == -1)
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return -1;
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} else {
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void *var = (char *)ctx->data + opt->offset;
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if (sep && opt->templ[sep + 1]) {
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const char *param = arg + sep;
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if (opt->templ[sep] == '=')
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param ++;
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if (process_opt_param(var, opt->templ + sep + 1,
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param, arg) == -1)
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return -1;
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} else
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*(int *)var = opt->value;
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}
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return 0;
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}
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static int process_opt_sep_arg(struct fuse_opt_context *ctx,
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const struct fuse_opt *opt, unsigned sep,
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const char *arg, int iso)
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{
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int res;
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char *newarg;
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char *param;
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if (next_arg(ctx, arg) == -1)
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return -1;
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param = ctx->argv[ctx->argctr];
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newarg = malloc(sep + strlen(param) + 1);
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if (!newarg)
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return alloc_failed();
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memcpy(newarg, arg, sep);
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strcpy(newarg + sep, param);
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res = process_opt(ctx, opt, sep, newarg, iso);
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free(newarg);
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return res;
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}
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static int process_gopt(struct fuse_opt_context *ctx, const char *arg, int iso)
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{
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unsigned sep;
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const struct fuse_opt *opt = find_opt(ctx->opt, arg, &sep);
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if (opt) {
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for (; opt; opt = find_opt(opt + 1, arg, &sep)) {
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int res;
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if (sep && opt->templ[sep] == ' ' && !arg[sep])
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res = process_opt_sep_arg(ctx, opt, sep, arg,
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iso);
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else
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res = process_opt(ctx, opt, sep, arg, iso);
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if (res == -1)
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return -1;
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}
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return 0;
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} else
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return call_proc(ctx, arg, FUSE_OPT_KEY_OPT, iso);
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}
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static int process_real_option_group(struct fuse_opt_context *ctx, char *opts)
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{
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char *s = opts;
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char *d = s;
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int end = 0;
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while (!end) {
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if (*s == '\0')
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end = 1;
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if (*s == ',' || end) {
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int res;
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*d = '\0';
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res = process_gopt(ctx, opts, 1);
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if (res == -1)
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return -1;
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d = opts;
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} else {
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if (s[0] == '\\' && s[1] != '\0') {
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s++;
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if (s[0] >= '0' && s[0] <= '3' &&
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s[1] >= '0' && s[1] <= '7' &&
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s[2] >= '0' && s[2] <= '7') {
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*d++ = (s[0] - '0') * 0100 +
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(s[1] - '0') * 0010 +
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(s[2] - '0');
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s += 2;
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} else {
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*d++ = *s;
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}
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} else {
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*d++ = *s;
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}
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}
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s++;
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}
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return 0;
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}
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static int process_option_group(struct fuse_opt_context *ctx, const char *opts)
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{
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int res;
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char *copy = strdup(opts);
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if (!copy) {
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fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n");
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return -1;
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}
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res = process_real_option_group(ctx, copy);
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free(copy);
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return res;
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}
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static int process_one(struct fuse_opt_context *ctx, const char *arg)
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{
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if (ctx->nonopt || arg[0] != '-')
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return call_proc(ctx, arg, FUSE_OPT_KEY_NONOPT, 0);
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else if (arg[1] == 'o') {
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if (arg[2])
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return process_option_group(ctx, arg + 2);
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else {
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if (next_arg(ctx, arg) == -1)
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return -1;
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return process_option_group(ctx,
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ctx->argv[ctx->argctr]);
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}
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} else if (arg[1] == '-' && !arg[2]) {
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if (add_arg(ctx, arg) == -1)
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return -1;
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ctx->nonopt = ctx->outargs.argc;
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return 0;
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} else
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return process_gopt(ctx, arg, 0);
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}
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static int opt_parse(struct fuse_opt_context *ctx)
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{
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if (ctx->argc) {
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if (add_arg(ctx, ctx->argv[0]) == -1)
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return -1;
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}
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for (ctx->argctr = 1; ctx->argctr < ctx->argc; ctx->argctr++)
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if (process_one(ctx, ctx->argv[ctx->argctr]) == -1)
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return -1;
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if (ctx->opts) {
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if (fuse_opt_insert_arg(&ctx->outargs, 1, "-o") == -1 ||
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fuse_opt_insert_arg(&ctx->outargs, 2, ctx->opts) == -1)
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return -1;
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}
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/* If option separator ("--") is the last argument, remove it */
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if (ctx->nonopt && ctx->nonopt == ctx->outargs.argc &&
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strcmp(ctx->outargs.argv[ctx->outargs.argc - 1], "--") == 0) {
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free(ctx->outargs.argv[ctx->outargs.argc - 1]);
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ctx->outargs.argv[--ctx->outargs.argc] = NULL;
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}
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return 0;
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}
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int fuse_opt_parse(struct fuse_args *args, void *data,
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const struct fuse_opt opts[], fuse_opt_proc_t proc)
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{
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int res;
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struct fuse_opt_context ctx = {
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.data = data,
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.opt = opts,
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.proc = proc,
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};
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if (!args || !args->argv || !args->argc)
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return 0;
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ctx.argc = args->argc;
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ctx.argv = args->argv;
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res = opt_parse(&ctx);
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if (res != -1) {
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struct fuse_args tmp = *args;
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*args = ctx.outargs;
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ctx.outargs = tmp;
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}
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free(ctx.opts);
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fuse_opt_free_args(&ctx.outargs);
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return res;
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}
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