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gconfig.c

/*
 * Copyright (C) 2007, 2008 Stig Venaas <venaas@uninett.no>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 */

#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <glob.h>
#include <sys/types.h>
#include <ctype.h>
#include <libgen.h>
#include <errno.h>
#include "debug.h"
#include "util.h"
#include "gconfig.h"

/* returns NULL on error, where to continue parsing if token and ok. E.g. "" will return token with empty string */
char *strtokenquote(char *s, char **token, char *del, char *quote, char *comment) {
    char *t = s, *q, *r;

    if (!t || !token || !del)
      return NULL;
    while (*t && strchr(del, *t))
      t++;
    if (!*t || (comment && strchr(comment, *t))) {
      *token = NULL;
      return t + 1; /* needs to be non-NULL, but value doesn't matter */
    }
    if (quote && (q = strchr(quote, *t))) {
      t++;
      r = t;
      while (*t && *t != *q)
          t++;
      if (!*t || (t[1] && !strchr(del, t[1])))
          return NULL;
      *t = '\0';
      *token = r;
      return t + 1;
    }
    *token = t;
    t++;
    while (*t && !strchr(del, *t))
      t++;
    *t = '\0';
    return t + 1;
}

int pushgconfdata(struct gconffile **cf, const char *data) {
    int i;
    struct gconffile *newcf;

    if (!*cf) {
      newcf = malloc(sizeof(struct gconffile) * 2);
      if (!newcf)
          return 0;
      memset(newcf, 0, sizeof(struct gconffile) * 2);
    } else {
      for (i = 0; (*cf)[i].data || (*cf)[i].path; i++);
      newcf = realloc(*cf, sizeof(struct gconffile) * (i + 2));
      if (!newcf)
          return 0;
      memmove(newcf + 1, newcf, sizeof(struct gconffile) * (i + 1));
      memset(newcf, 0, sizeof(struct gconffile));
    }
    newcf[0].data = data;
    *cf = newcf;
    return 1;
}

FILE *pushgconffile(struct gconffile **cf, FILE *file, const char *description) {
    int i;
    struct gconffile *newcf;
    char *desc;

    if (!file) {
        debug(DBG_INFO, "could not read config from %s", description);
      return NULL;
    }
    debug(DBG_DBG, "reading config from %s", description);

    desc = stringcopy(description, 0);
    if (!desc)
      goto errmalloc;

    if (!*cf) {
      newcf = malloc(sizeof(struct gconffile) * 2);
      if (!newcf)
          goto errmalloc;
      memset(newcf, 0, sizeof(struct gconffile) * 2);
    } else {
      for (i = 0; (*cf)[i].data || (*cf)[i].path; i++);
      newcf = realloc(*cf, sizeof(struct gconffile) * (i + 2));
      if (!newcf)
          goto errmalloc;
      memmove(newcf + 1, newcf, sizeof(struct gconffile) * (i + 1));
      memset(newcf, 0, sizeof(struct gconffile));
    }
    newcf[0].file = file;
    newcf[0].path = desc;
    *cf = newcf;
    return file;

errmalloc:
    free(desc);
    fclose(file);
    debug(DBG_ERR, "malloc failed");
    return NULL;
}

FILE *pushgconfpath(struct gconffile **cf, const char *path) {
    FILE *f;

    f = fopen(path, "r");
    return pushgconffile(cf, f, path);
}

FILE *pushgconfpaths(struct gconffile **cf, const char *cfgpath) {
    int i;
    FILE *f = NULL;
    glob_t globbuf;
    char *path, *curfile = NULL, *dir;

    /* if cfgpath is relative, make it relative to current config */
    if (*cfgpath == '/')
      path = (char *)cfgpath;
    else {
      /* dirname may modify its argument */
      curfile = stringcopy((*cf)->path, 0);
      if (!curfile) {
          debug(DBG_ERR, "malloc failed");
          goto exit;
      }
      dir = dirname(curfile);
      path = malloc(strlen(dir) + strlen(cfgpath) + 2);
      if (!path) {
          debug(DBG_ERR, "malloc failed");
          goto exit;
      }
      strcpy(path, dir);
      path[strlen(dir)] = '/';
      strcpy(path + strlen(dir) + 1, cfgpath);
    }
    memset(&globbuf, 0, sizeof(glob_t));
    if (glob(path, 0, NULL, &globbuf)) {
      debug(DBG_WARN, "could not glob %s", path);
      goto exit;
    }

    for (i = globbuf.gl_pathc - 1; i >= 0; i--) {
      f = pushgconfpath(cf, globbuf.gl_pathv[i]);
      if (!f)
          break;
    }
    globfree(&globbuf);

exit:
    if (curfile) {
      free(curfile);
      free(path);
    }
    return f;
}

int popgconf(struct gconffile **cf) {
    int i;

    if (!*cf)
      return 0;
    for (i = 0; (*cf)[i].data || (*cf)[i].path; i++);
    if (i && (*cf)[0].file) {
      fclose((*cf)[0].file);
      if ((*cf)[0].path) {
          debug(DBG_DBG, "closing config file %s", (*cf)[0].path);
          free((*cf)[0].path);
      }
    }
    if (i < 2) {
      free(*cf);
      *cf = NULL;
      return 0;
    }
    memmove(*cf, *cf + 1, sizeof(struct gconffile) * i);
    return 1;
}

void freegconfmstr(char **mstr) {
    int i;

    if (mstr) {
      for (i = 0; mstr[i]; i++)
          free(mstr[i]);
      free(mstr);
    }
}

void freegconf(struct gconffile **cf) {
    int i;

    if (!*cf)
      return;

    for (i = 0; (*cf)[i].data || (*cf)[i].path; i++) {
      if ((*cf)[i].file) {
          fclose((*cf)[i].file);
          if ((*cf)[i].path) {
            debug(DBG_DBG, "closing config file %s", (*cf)[i].path);
            free((*cf)[i].path);
          }
      }
    }
    free(*cf);
    *cf = NULL;
}

struct gconffile *openconfigfile(const char *file) {
    struct gconffile *cf = NULL;

    if (!pushgconfpath(&cf, file)) {
      debug(DBG_ERR, "could not read config file %s\n%s", file, strerror(errno));
      return NULL;
    }
    debug(DBG_DBG, "reading config file %s", file);
    return cf;
}

/* Parses config with following syntax:
 * One of these:
 * option-name value
 * option-name = value
 * Or:
 * option-name value {
 *     option-name [=] value
 *     ...
 * }
 */

int getlinefromcf(struct gconffile *cf, char *line, const size_t size) {
    size_t i, pos;

    if (!cf)
      return 0;

    if (cf->file)
      return fgets(line, size, cf->file) ? 1 : 0;
    else if (cf->data) {
      pos = cf->datapos;
      if (!cf->data[pos])
          return 0;
      for (i = pos; cf->data[i] && cf->data[i] != '\n'; i++);
      if (cf->data[i] == '\n')
          i++;
      if (i - pos > size - 1)
          i = size - 1 + pos;
      memcpy(line, cf->data + pos, i - pos);
      line[i - pos] = '\0';
      cf->datapos = i;
      return 1;
    }
    return 0;
}

int getconfigline(struct gconffile **cf, char *block, char **opt, char **val, int *conftype) {
    char line[1024];
    char *tokens[3], *s;
    int tcount;

    *opt = NULL;
    *val = NULL;
    *conftype = 0;

    if (!cf || !*cf || (!(*cf)->file && !(*cf)->data))
      return 1;

    for (;;) {
      if (!getlinefromcf(*cf, line, 1024)) {
          if (popgconf(cf))
            continue;
          return 1;
      }
      s = line;
      for (tcount = 0; tcount < 3; tcount++) {
          s = strtokenquote(s, &tokens[tcount], " \t\r\n", "\"'", tcount ? NULL : "#");
          if (!s) {
            debug(DBG_ERR, "Syntax error in line starting with: %s", line);
            return 0;
          }
          if (!tokens[tcount])
            break;
      }
      if (!tcount || **tokens == '#')
          continue;

      if (**tokens == '}') {
          if (block)
            return 1;
          debug(DBG_ERR, "configuration error, found } with no matching {");
          return 0;
      }
      break;
    }

    switch (tcount) {
    case 2:
      *opt = stringcopy(tokens[0], 0);
      if (!*opt)
          goto errmalloc;
      *val = stringcopy(tokens[1], 0);
      if (!*val)
          goto errmalloc;
      *conftype = CONF_STR;
      break;
    case 3:
      if (tokens[1][0] == '=' && tokens[1][1] == '\0') {
          *opt = stringcopy(tokens[0], 0);
          if (!*opt)
            goto errmalloc;
          *val = stringcopy(tokens[2], 0);
          if (!*val)
            goto errmalloc;
          *conftype = CONF_STR;
          break;
      }
      if (tokens[2][0] == '{' && tokens[2][1] == '\0') {
          *opt = stringcopy(tokens[0], 0);
          if (!*opt)
            goto errmalloc;
          *val = stringcopy(tokens[1], 0);
          if (!*val)
            goto errmalloc;
          *conftype = CONF_CBK;
          break;
      }
      /* fall through */
    default:
      if (block)
          debug(DBG_ERR, "configuration error in block %s, line starting with %s", block, tokens[0]);
      else
          debug(DBG_ERR, "configuration error, syntax error in line starting with %s", tokens[0]);
      return 0;
    }

    if (**val)
      return 1;

    debug(DBG_ERR, "configuration error, option %s needs a non-empty value", *opt);
    goto errexit;

errmalloc:
    debug(DBG_ERR, "malloc failed");
errexit:
    free(*opt);
    *opt = NULL;
    free(*val);
    *val = NULL;
    return 0;
}

uint8_t hexdigit2int(char d) {
    if (d >= '0' && d <= '9')
      return d - '0';
    if (d >= 'a' && d <= 'f')
      return 10 + d - 'a';
    if (d >= 'A' && d <= 'F')
      return 10 + d - 'A';
    return 0;
}

void unhex(char *s) {
    char *t;
    for (t = s; *t; s++) {
      if (*t == '%' && isxdigit((int)t[1]) && isxdigit((int)t[2])) {
          *s = 16 * hexdigit2int(t[1]) + hexdigit2int(t[2]);
          t += 3;
      } else
          *s = *t++;
    }
    *s = '\0';
}

typedef int (*t_fptr)(struct gconffile **, void *, char *, char *, char *);

/* returns 1 if ok, 0 on error */
/* caller must free returned values also on error */
int getgenericconfig(struct gconffile **cf, char *block, ...) {
    va_list ap;
    char *opt = NULL, *val, *word, *optval, **str = NULL, ***mstr = NULL, **newmstr, *endptr;
    uint8_t *bln = NULL;
    long int *lint = NULL;
    int type = 0, conftype = 0, n;
    t_fptr cbk = NULL;
    void *cbkarg = NULL;

    for (;;) {
      free(opt);
      if (!getconfigline(cf, block, &opt, &val, &conftype))
          return 0;
      if (!opt)
          return 1;

      if (conftype == CONF_STR && !strcasecmp(opt, "include")) {
          if (!pushgconfpaths(cf, val)) {
            debug(DBG_ERR, "failed to include config file %s", val);
            goto errexit;
          }
          free(val);
          continue;
      }

      va_start(ap, block);
      while ((word = va_arg(ap, char *))) {
          type = va_arg(ap, int);
          switch (type) {
          case CONF_STR:
            str = va_arg(ap, char **);
            if (!str)
                goto errparam;
            break;
          case CONF_MSTR:
            mstr = va_arg(ap, char ***);
            if (!mstr)
                goto errparam;
            break;
          case CONF_BLN:
            bln = va_arg(ap, uint8_t *);
            if (!bln)
                goto errparam;
            break;
          case CONF_LINT:
            lint = va_arg(ap, long int *);
            if (!lint)
                goto errparam;
            break;
          case CONF_CBK:
            cbk = va_arg(ap, t_fptr);
            if (!cbk)
                goto errparam;
            cbkarg = va_arg(ap, void *);
            break;
          default:
            goto errparam;
          }
          if (!strcasecmp(opt, word))
            break;
      }
      va_end(ap);

      if (!word) {
          if (block)
            debug(DBG_ERR, "configuration error in block %s, unknown option %s", block, opt);
          debug(DBG_ERR, "configuration error, unknown option %s", opt);
          goto errexit;
      }

      if (((type == CONF_STR || type == CONF_MSTR || type == CONF_BLN || type == CONF_LINT) && conftype != CONF_STR) ||
          (type == CONF_CBK && conftype != CONF_CBK)) {
          if (block)
            debug(DBG_ERR, "configuration error in block %s, wrong syntax for option %s", block, opt);
          debug(DBG_ERR, "configuration error, wrong syntax for option %s", opt);
          goto errexit;
      }

      switch (type) {
      case CONF_STR:
          if (*str) {
            debug(DBG_ERR, "configuration error, option %s already set to %s", opt, *str);
            goto errexit;
          }
          unhex(val);
          *str = val;
          break;
      case CONF_MSTR:
          if (*mstr)
            for (n = 0; (*mstr)[n]; n++);
          else
            n = 0;
          newmstr = realloc(*mstr, sizeof(char *) * (n + 2));
          if (!newmstr) {
            debug(DBG_ERR, "malloc failed");
            goto errexit;
          }
          unhex(val);
          newmstr[n] = val;
          newmstr[n + 1] = NULL;
          *mstr = newmstr;
          break;
      case CONF_BLN:
          if (!strcasecmp(val, "on"))
            *bln = 1;
          else if (!strcasecmp(val, "off"))
            *bln = 0;
          else {
            if (block)
                debug(DBG_ERR, "configuration error in block %s, value for option %s must be on or off, not %s", block, opt, val);
            else
                debug(DBG_ERR, "configuration error, value for option %s must be on or off, not %s", opt, val);
            goto errexit;
          }
          break;
      case CONF_LINT:
          endptr = NULL;
          *lint = strtol(val, &endptr, 0);
          if (*lint == LONG_MIN || *lint == LONG_MAX || !endptr || endptr == val || *endptr != '\0') {
            if (block)
                debug(DBG_ERR, "configuration error in block %s, value for option %s must be an integer, not %s", block, opt, val);
            else
                debug(DBG_ERR, "configuration error, value for option %s must be an integer, not %s", opt, val);
            goto errexit;
          }
          break;
      case CONF_CBK:
          optval = malloc(strlen(opt) + strlen(val) + 2);
          if (!optval) {
            debug(DBG_ERR, "malloc failed");
            goto errexit;
          }
          sprintf(optval, "%s %s", opt, val);
          if (!cbk(cf, cbkarg, optval, opt, val)) {
            free(optval);
            goto errexit;
          }
          free(val);
          free(optval);
          continue;
      default:
          goto errparam;
      }
      if (block)
          debug(DBG_DBG, "getgenericconfig: block %s: %s = %s", block, opt, val);
      else
          debug(DBG_DBG, "getgenericconfig: %s = %s", opt, val);
      if (type == CONF_BLN || type == CONF_LINT)
          free(val);
    }

errparam:
    debug(DBG_ERR, "getgenericconfig: internal parameter error");
errexit:
    free(opt);
    free(val);
    return 0;
}

/* Local Variables: */
/* c-file-style: "stroustrup" */
/* End: */

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