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Sources/firewall3/utils.h

  1 /*
  2  * firewall3 - 3rd OpenWrt UCI firewall implementation
  3  *
  4  *   Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
  5  *
  6  * Permission to use, copy, modify, and/or distribute this software for any
  7  * purpose with or without fee is hereby granted, provided that the above
  8  * copyright notice and this permission notice appear in all copies.
  9  *
 10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 17  */
 18 
 19 #ifndef __FW3_UTILS_H
 20 #define __FW3_UTILS_H
 21 
 22 #include <stdlib.h>
 23 #include <stdbool.h>
 24 #include <unistd.h>
 25 #include <signal.h>
 26 #include <fcntl.h>
 27 #include <limits.h>
 28 #include <sys/stat.h>
 29 #include <sys/wait.h>
 30 #include <sys/file.h>
 31 #include <sys/types.h>
 32 #include <ifaddrs.h>
 33 #include <netdb.h>
 34 
 35 #include <libubox/list.h>
 36 #include <libubox/blob.h>
 37 #include <uci.h>
 38 
 39 
 40 #define FW3_STATEFILE   "/var/run/fw3.state"
 41 #define FW3_LOCKFILE    "/var/run/fw3.lock"
 42 #define FW3_HELPERCONF  "/usr/share/fw3/helpers.conf"
 43 #define FW3_HOTPLUG     "/sbin/hotplug-call"
 44 
 45 extern bool fw3_pr_debug;
 46 
 47 struct fw3_address;
 48 
 49 void warn_elem(struct uci_element *e, const char *format, ...)
 50         __attribute__ ((format (printf, 2, 3)));
 51 void warn(const char *format, ...)
 52         __attribute__ ((format (printf, 1, 2)));
 53 void error(const char *format, ...)
 54         __attribute__ ((format (printf, 1, 2)));
 55 void info(const char *format, ...)
 56         __attribute__ ((format (printf, 1, 2)));
 57 
 58 #define warn_section(t, r, e, fmt, ...)                                 \
 59         do {                                                                    \
 60                 if (e)                                                          \
 61                         warn_elem(e, fmt, ##__VA_ARGS__);                       \
 62                 else                                                            \
 63                         warn("Warning: ubus " t " (%s) " fmt,                   \
 64                                 (r && r->name) ? r->name : "?", ##__VA_ARGS__); \
 65         } while(0)
 66 
 67 #define fw3_setbit(field, flag) field |= (1 << (flag))
 68 #define fw3_delbit(field, flag) field &= ~(1 << (flag))
 69 #define fw3_hasbit(field, flag) (field & (1 << (flag)))
 70 
 71 #define set(field, family, flag) fw3_setbit(field[family == FW3_FAMILY_V6], flag)
 72 #define del(field, family, flag) fw3_delbit(field[family == FW3_FAMILY_V6], flag)
 73 #define has(field, family, flag) fw3_hasbit(field[family == FW3_FAMILY_V6], flag)
 74 
 75 #define fw3_foreach(p, h)                                                  \
 76         for (p = list_empty(h) ? NULL : list_first_entry(h, typeof(*p), list); \
 77          list_empty(h) ? (p == NULL) : (&p->list != (h));                  \
 78              p = list_empty(h) ? list_first_entry(h, typeof(*p), list)         \
 79                            : list_entry(p->list.next, typeof(*p), list))
 80 
 81 #define fw3_is_family(p, f)                                                \
 82         (!p || (p)->family == FW3_FAMILY_ANY || (p)->family == f)
 83 
 84 #define fw3_no_family(flags)                                               \
 85         (!(flags & ((1 << FW3_FAMILY_V4) | (1 << FW3_FAMILY_V6))))
 86 
 87 #define fw3_no_table(flags)                                                \
 88     (!(flags & ((1<<FW3_TABLE_FILTER)|(1<<FW3_TABLE_NAT)|                  \
 89                 (1<<FW3_TABLE_MANGLE)|(1<<FW3_TABLE_RAW))))
 90 
 91 
 92 void * fw3_alloc(size_t size);
 93 char * fw3_strdup(const char *s);
 94 
 95 const char * fw3_find_command(const char *cmd);
 96 
 97 bool fw3_stdout_pipe(void);
 98 bool __fw3_command_pipe(bool silent, const char *command, ...);
 99 #define fw3_command_pipe(...) __fw3_command_pipe(__VA_ARGS__, NULL)
100 
101 void fw3_command_close(void);
102 void fw3_pr(const char *fmt, ...)
103         __attribute__ ((format (printf, 1, 2)));
104 
105 bool fw3_has_table(const bool ipv6, const char *table);
106 
107 bool fw3_has_target(const bool ipv6, const char *target);
108 
109 bool fw3_lock(void);
110 void fw3_unlock(void);
111 bool fw3_lock_path(int *fw3_lock_fd, const char *path);
112 void fw3_unlock_path(int *fw3_lock_fd, const char *path);
113 
114 
115 void fw3_write_statefile(void *state);
116 
117 void fw3_free_object(void *obj, const void *opts);
118 
119 void fw3_free_list(struct list_head *head);
120 
121 bool fw3_hotplug(bool add, void *zone, void *device);
122 
123 int fw3_netmask2bitlen(int family, void *mask);
124 
125 bool fw3_bitlen2netmask(int family, int bits, void *mask);
126 
127 void fw3_flush_conntrack(void *zone);
128 
129 bool fw3_attr_parse_name_type(struct blob_attr *entry, const char **name, const char **type);
130 
131 const char * fw3_protoname(void *proto);
132 
133 bool fw3_check_loopback_dev(const char *name);
134 
135 bool fw3_check_loopback_addr(struct fw3_address *addr);
136 #endif
137 

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