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      1 /*
      2  * Copyright (c) 2013, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *  * Neither the name of Google, Inc. nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this
     16  *    software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     22  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     25  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <fcntl.h>
     33 #include <string.h>
     34 #include <unistd.h>
     35 #include <sys/types.h>
     36 
     37 #include "protocol.h"
     38 #include "utils.h"
     39 
     40 #include "debug.h"
     41 
     42 // TODO: change config path
     43 #define CONFIG_PATH "/data/fastboot.cfg"
     44 
     45 static int config_parse_line(char *line)
     46 {
     47     char *c;
     48     char *key;
     49     char *value;
     50 
     51     c = strchr(line, '#');
     52     if (c)
     53         *c = '\0';
     54 
     55     if (strspn(line, " \t") == strlen(line))
     56         return 0;
     57 
     58     c = strchr(line, '=');
     59     if (c == NULL)
     60         return -1;
     61 
     62     key = line;
     63     *c = '\0';
     64     value = c + 1;
     65 
     66     key = strip(key);
     67     value = strip(value);
     68 
     69     key = strdup(key);
     70     value = strdup(value);
     71 
     72     fastboot_publish(key, value);
     73 
     74     return 0;
     75 }
     76 
     77 static void config_parse(char *buffer)
     78 {
     79     char *saveptr;
     80     char *str = buffer;
     81     char *line = buffer;
     82     int c;
     83     int ret;
     84 
     85     for (c = 1; line != NULL; c++) {
     86         line = strtok_r(str, "\r\n", &saveptr);
     87         if (line != NULL) {
     88             D(VERBOSE, "'%s'", line);
     89             ret = config_parse_line(line);
     90             if (ret < 0) {
     91                 D(WARN, "error parsing " CONFIG_PATH " line %d", c);
     92             }
     93         }
     94         str = NULL;
     95     }
     96 }
     97 
     98 void config_init()
     99 {
    100     int fd;
    101     off_t len;
    102     ssize_t ret;
    103     size_t count = 0;
    104     char *buffer;
    105 
    106     fd = open(CONFIG_PATH, O_RDONLY);
    107     if (fd < 0) {
    108         D(ERR, "failed to open " CONFIG_PATH);
    109         return;
    110     }
    111 
    112     len = lseek(fd, 0, SEEK_END);
    113     if (len < 0) {
    114         D(ERR, "failed to seek to end of " CONFIG_PATH);
    115         return;
    116     }
    117 
    118     lseek(fd, 0, SEEK_SET);
    119 
    120     buffer = malloc(len + 1);
    121     if (buffer == NULL) {
    122         D(ERR, "failed to allocate %ld bytes", len);
    123         return;
    124     }
    125 
    126     while (count < (size_t)len) {
    127         ret = read(fd, buffer + count, len - count);
    128         if (ret < 0 && errno != EINTR) {
    129             D(ERR, "failed to read " CONFIG_PATH ": %d %s", errno, strerror(errno));
    130             return;
    131         }
    132         if (ret == 0) {
    133             D(ERR, "early EOF reading " CONFIG_PATH);
    134             return;
    135         }
    136 
    137         count += ret;
    138     }
    139 
    140     buffer[len] = '\0';
    141 
    142     config_parse(buffer);
    143 
    144     free(buffer);
    145 }
    146