razzor/bcastfwd
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initial version

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This commit is contained in:
Olaf Rempel 2010-12-12 16:23:33 +01:00
commit 6fd87d0ab0
18 changed files with 1936 additions and 0 deletions
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7
.gitignore vendored Normal file
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*.o
*.d
bcastfwd
bcastfwd.pid
bcastfwd.log

45
Makefile Normal file
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DESTDIR =
BINARY_DIR = /usr/local/bin
CONFIG_DIR = /usr/local/etc
LOG_DIR = /var/log
PID_DIR = /var/run
# ############################
SRC := $(wildcard *.c)
TARGET := bcastfwd
CFLAGS := -O2 -Wall -Wno-unused-result -MMD -I.
LDFLAGS :=
# ############################
ifeq ($(strip $(wildcard $(DESTDIR)$(CONFIG_DIR)/$(TARGET).conf)),)
NEWCONF=$(TARGET).conf
else
NEWCONF=$(TARGET).conf.dist
endif
# ############################
all: $(TARGET)
$(TARGET): $(SRC:%.c=%.o)
@echo " Linking file: $@"
@$(CC) $(LDFLAGS) $^ -o $@
%.o: %.c
@echo " Building file: $<"
@$(CC) $(CFLAGS) -o $@ -c $<
install: all
install -D -m 755 -s $(TARGET) $(DESTDIR)$(BINARY_DIR)/$(TARGET)
install -D -m 644 $(TARGET).conf $(DESTDIR)$(CONFIG_DIR)/$(NEWCONF)
sed -i -e "s:^logfile .*$$:logfile $(LOG_DIR)/$(TARGET).log:" \
-e "s:^pidfile .*$$:pidfile $(PID_DIR)/$(TARGET).pid:" \
$(DESTDIR)$(CONFIG_DIR)/$(NEWCONF)
install -d -m 755 $(DESTDIR)$(LOG_DIR)
clean:
rm -rf *.d *.o $(TARGET)
include $(shell find . -name \*.d 2> /dev/null)

256
bcastfwd.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <time.h>
#include "configfile.h"
#include "event.h"
#include "list.h"
#include "logging.h"
#include "sockaddr.h"
struct host_entry {
struct list_head list;
struct sockaddr_in address;
int flags;
};
#define HOST_ACTIVE 0x0001
#define HOST_LOCAL 0x0010
#define HOST_REMOTE 0x0020
static LIST_HEAD(host_list);
static int raw_sock;
static int listen_sock;
static struct event_fd *listen_event;
static struct event_timeout *local_timeout;
static struct event_timeout *remote_timeout;
static int add_host_cb(const char *parameter, void *privdata)
{
struct host_entry *entry = malloc(sizeof(struct host_entry));
if (entry == NULL) {
log_print(LOG_WARN, "add_host_cb(): out of memory");
return -1;
}
if (parse_sockaddr(parameter, &entry->address)) {
log_print(LOG_WARN, "add_host_cb(): invalid host: '%s'", parameter);
free(entry);
return -1;
}
entry->flags = (int)privdata | HOST_ACTIVE;
log_print(LOG_INFO, "Forwarding to %s (%s)", get_sockaddr_buf(&entry->address), (entry->flags == HOST_LOCAL) ? "local" : "remote");
list_add_tail(&entry->list, &host_list);
return 0;
}
static int check_local_host_cb(void *privdata)
{
struct host_entry *entry;
list_for_each_entry(entry, &host_list, list) {
if (!(entry->flags & HOST_LOCAL))
continue;
int sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
log_print(LOG_WARN, "check_local_host_cb(): socket()");
continue;
}
if (bind(sock,(struct sockaddr *)&entry->address, sizeof(struct sockaddr_in)) < 0) {
/* port in use, host seems to be active */
if (!(entry->flags & HOST_ACTIVE)) {
log_print(LOG_INFO, "Host active: %s", get_sockaddr_buf(&entry->address));
entry->flags |= HOST_ACTIVE;
}
} else {
/* port not in use, host can not be active */
if (entry->flags & HOST_ACTIVE) {
log_print(LOG_INFO, "Host not active: %s", get_sockaddr_buf(&entry->address));
entry->flags &= ~(HOST_ACTIVE);
}
}
close(sock);
}
return 0;
}
#if 0
static int check_remote_host_cb(void *privdata)
{
// TODO: don't know how to check
return 0;
}
#endif
static int send_raw_udp(int fd, struct sockaddr_in *src, struct sockaddr_in *dst, const char *buf, int offset, int size)
{
if (offset < sizeof(struct iphdr) + sizeof(struct udphdr))
return -1;
struct iphdr *ip = (struct iphdr *)buf;
struct udphdr *udp = (struct udphdr *)(buf + sizeof(struct iphdr));
ip->version = 4; /* IPv4 */
ip->ihl = sizeof(struct iphdr) / sizeof(int);
ip->tos = 0;
ip->id = 0;
ip->frag_off = 0;
ip->ttl = 64;
ip->protocol = IPPROTO_UDP;
ip->check = 0; /* computed by kernel */
ip->saddr = src->sin_addr.s_addr;
ip->daddr = dst->sin_addr.s_addr;
int packetsize = sizeof(struct iphdr) + sizeof(struct udphdr) + size;
ip->tot_len = htons(packetsize);
udp->source = src->sin_port;
udp->dest = dst->sin_port;
udp->check = 0; /* ignore */
udp->len = htons(sizeof(struct udphdr) + size);
if (sendto(fd, buf, packetsize, 0, (struct sockaddr *)dst, sizeof(struct sockaddr)) < 0) {
log_print(LOG_WARN, "send_raw_udp(): sendto()");
return -1;
}
return 0;
}
static int listen_cb(int fd, void *privdata)
{
struct sockaddr_in src_addr;
char buf[512];
socklen_t i = sizeof(src_addr);
int offset = sizeof(struct iphdr) + sizeof(struct udphdr);
int len = recvfrom(fd, buf + offset, sizeof(buf) - offset, 0, (struct sockaddr *)&src_addr, &i);
if (len <= 0) {
log_print(LOG_WARN, "listen_cb(): recvfrom()");
return -1;
}
struct host_entry *entry;
list_for_each_entry(entry, &host_list, list) {
if (!(entry->flags & HOST_ACTIVE))
continue;
send_raw_udp(raw_sock, &src_addr, &entry->address, buf, offset, len);
}
return 0;
}
int bcast_close(void)
{
if (remote_timeout != NULL) {
event_remove_timeout(remote_timeout);
remote_timeout = NULL;
}
if (local_timeout != NULL) {
event_remove_timeout(local_timeout);
local_timeout = NULL;
}
struct host_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &host_list, list) {
list_del(&entry->list);
free(entry);
}
event_remove_fd(listen_event);
close(listen_sock);
close(raw_sock);
return 0;
}
int bcast_init(void)
{
raw_sock = socket(PF_INET, SOCK_RAW, IPPROTO_UDP);
if (raw_sock < 0) {
log_print(LOG_ERROR, "bcast_init(): socket(raw)");
return -1;
}
int i = 1;
if (setsockopt(raw_sock, IPPROTO_IP, IP_HDRINCL, &i, sizeof(i)) < 0 ) {
log_print(LOG_ERROR, "bcast_init(): setsockopt(IP_HDRINCL)");
close(raw_sock);
return -1;
}
int listen_port = 0;
if (config_get_int("global", "listen", &listen_port, 0)) {
log_print(LOG_ERROR, "bcast_init(): Invalid listen port: %d", listen_port);
close(raw_sock);
return -1;
}
struct sockaddr_in listen_addr;
listen_addr.sin_family = AF_INET,
listen_addr.sin_addr.s_addr = INADDR_ANY;
listen_addr.sin_port = htons(listen_port);
listen_sock = socket(AF_INET, SOCK_DGRAM, 0);
if (listen_sock < 0) {
log_print(LOG_ERROR, "bcast_init(): socket(listen)");
close(raw_sock);
return -1;
}
if (bind(listen_sock, (struct sockaddr *)&listen_addr, sizeof(struct sockaddr_in)) < 0) {
log_print(LOG_ERROR, "bcast_init(): bind()");
close(listen_sock);
close(raw_sock);
return -1;
}
log_print(LOG_INFO, "Listening on %s", get_sockaddr_buf(&listen_addr));
listen_event = event_add_readfd(NULL, listen_sock, listen_cb, NULL);
int localcount, remotecount;
localcount = config_get_strings("local", "host", add_host_cb, (void *)HOST_LOCAL);
remotecount = config_get_strings("remote", "host", add_host_cb, (void *)HOST_REMOTE);
if ((localcount + remotecount) == 0) {
log_print(LOG_ERROR, "bcast_init(): no hosts given");
event_remove_fd(listen_event);
close(listen_sock);
close(raw_sock);
return -1;
}
int check_interval = 0;
struct timeval tv;
tv.tv_usec = 0;
if (localcount > 0) {
config_get_int("local", "check_interval", &check_interval, 10);
tv.tv_sec = check_interval;
local_timeout = event_add_timeout(&tv, check_local_host_cb, NULL);
}
#if 0
if (remotecount > 0) {
config_get_int("remote", "check_interval", &check_interval, 60);
tv.tv_sec = check_interval;
remote_timeout = event_add_timeout(&tv, check_remote_host_cb, NULL);
}
#endif
return 0;
}

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bcastfwd.conf Normal file
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[global]
logfile bcastfwd.log
pidfile bcastfwd.pid
listen 27015
[local]
check_interval 10
host 10.10.250.133:27016
[remote]
check_interval 60
host 10.10.250.134:27016

288
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/***************************************************************************
* Copyright (C) 03/2010 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include "configfile.h"
#include "list.h"
#include "logging.h"
#define BUFSIZE 1024
struct conf_section {
struct list_head list;
struct list_head tupel_list;
const char *name;
};
struct conf_tupel {
struct list_head list;
const char *option;
const char *parameter;
};
static LIST_HEAD(config_list);
static struct conf_section * config_add_section(const char *name)
{
struct conf_section *section;
section = malloc(sizeof(struct conf_section) + strlen(name));
if (section == NULL)
return NULL;
INIT_LIST_HEAD(&section->list);
INIT_LIST_HEAD(&section->tupel_list);
section->name = strdup(name);
if (section->name == NULL) {
free(section);
return NULL;
}
list_add_tail(&section->list, &config_list);
return section;
}
static int config_add_tupel(struct conf_section *section, const char *option, const char *parameter)
{
struct conf_tupel *tupel = malloc(sizeof(struct conf_tupel));
if (tupel == NULL)
return -1;
INIT_LIST_HEAD(&tupel->list);
tupel->option = strdup(option);
tupel->parameter = strdup(parameter);
if (tupel->option == NULL || tupel->parameter == NULL) {
free(tupel);
return -1;
}
list_add_tail(&tupel->list, &section->tupel_list);
return 0;
}
int config_parse(const char *config)
{
FILE *fz = fopen(config, "r");
if (fz == NULL) {
log_print(LOG_ERROR, "config_parse(): %s", config);
return -1;
}
char *line = malloc(BUFSIZE);
if (line == NULL) {
log_print(LOG_ERROR, "config_parse(): out of memory");
fclose(fz);
return -1;
}
int linenum = 0;
struct conf_section *section = NULL;
while (fgets(line, BUFSIZE, fz) != NULL) {
linenum++;
if (line[0] == '#' || line[0] <= ' ') {
continue;
} else if (line[0] == '[') {
char *tok = strtok(line +1, " ]\n");
if (tok == NULL || (section = config_add_section(tok)) == NULL) {
log_print(LOG_WARN, "config_parse(): invalid section in row %d", linenum);
free(line);
fclose(fz);
return -1;
}
continue;
} else if (section == NULL) {
log_print(LOG_WARN, "config_parse(): missing section in row %d", linenum);
free(line);
fclose(fz);
return -1;
}
char *tmp, *tok = strtok_r(line, " \t\n", &tmp);
if (tok != NULL) {
char *tok2;
while ((tok2 = strtok_r(NULL, " \n", &tmp))) {
if (config_add_tupel(section, tok, tok2) != 0)
log_print(LOG_WARN, "config_parse(): invalid row %d", linenum);
}
}
}
fclose(fz);
free(line);
return 0;
}
void config_free(void)
{
struct conf_section *section, *section_tmp;
struct conf_tupel *tupel, *tupel_tmp;
list_for_each_entry_safe(section, section_tmp, &config_list, list) {
list_for_each_entry_safe(tupel, tupel_tmp, &section->tupel_list, list) {
list_del(&tupel->list);
free((char *)tupel->option);
free((char *)tupel->parameter);
free(tupel);
}
list_del(&section->list);
free(section);
}
}
static struct conf_section * config_get_section(const char *name)
{
struct conf_section *section;
list_for_each_entry(section, &config_list, list) {
if (!strcmp(section->name, name))
return section;
}
return NULL;
}
const char * config_get_string(const char *section_str, const char *option, const char *def)
{
struct conf_section *section = config_get_section(section_str);
if (section != NULL) {
struct conf_tupel *tupel;
list_for_each_entry(tupel, &section->tupel_list, list) {
if (!strcmp(tupel->option, option))
return tupel->parameter;
}
}
if (def != NULL)
log_print(LOG_WARN, "config [%s:%s] not found, using default: '%s'",
section_str, option, def);
return def;
}
int config_get_int(const char *section, const char *option, int *value, int def)
{
const char *ret = config_get_string(section, option, NULL);
if (ret == NULL) {
log_print(LOG_WARN, "config [%s:%s] not found, using default: '%d'",
section, option, def);
*value = def;
return -1;
}
char *tmp;
*value = strtol(ret, &tmp, 0);
if (*tmp != '\0' && !isspace(*tmp)) {
log_print(LOG_WARN, "config [%s:%s] not an integer: '%s', using default '%d'",
section, option, ret, def);
*value = def;
return -1;
}
return 0;
}
int config_get_strings(const char *section_str, const char *option,
int (*callback)(const char *value, void *privdata),
void *privdata)
{
struct conf_section *section = config_get_section(section_str);
if (section == NULL)
return -1;
int cnt = 0;
struct conf_tupel *tupel;
list_for_each_entry(tupel, &section->tupel_list, list) {
if (!strcmp(tupel->option, option))
if (callback(tupel->parameter, privdata) == 0)
cnt++;
}
return cnt;
}
struct strtoken * strtokenize(const char *input, const char *delim, int maxfields)
{
struct strtoken *tokens = malloc(sizeof(struct strtoken) +
(maxfields +1) * sizeof(char *) +
strlen(input));
if (tokens == NULL)
return NULL;
char *ptr = (char *)&tokens->field[maxfields];
strcpy(ptr, input);
int i;
char *tmp;
tokens->count = 0;
for (i = 0; i < maxfields; i++) {
tokens->field[i] = strtok_r(ptr, delim, &tmp);
ptr = NULL;
if (tokens->field[i] != NULL)
tokens->count++;
}
return tokens;
}
struct strtoken * config_get_strtoken(const char *section, const char *option, const char *delim, int maxfields)
{
const char *ret = config_get_string(section, option, NULL);
if (ret == NULL) {
log_print(LOG_WARN, "config [%s:%s] not found", section, option);
return NULL;
}
return strtokenize(ret, delim, maxfields);
}
int config_get_strtokens(const char *section_str, const char *option, const char *delim, int maxfields,
int (*callback)(struct strtoken *data, void *privdata),
void *privdata)
{
struct conf_section *section = config_get_section(section_str);
if (section == NULL)
return -1;
int cnt = 0;
struct conf_tupel *tupel;
list_for_each_entry(tupel, &section->tupel_list, list) {
if (!strcmp(tupel->option, option)) {
struct strtoken *tokens = strtokenize(tupel->parameter, delim, maxfields);
if (tokens != NULL) {
if (callback(tokens, privdata) == 0)
cnt++;
free(tokens);
}
}
}
return cnt;
}

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#ifndef _CONFIG_H_
#define _CONFIG_H_
int config_parse(const char *config);
void config_free(void);
const char * config_get_string(const char *section_str, const char *option, const char *def);
int config_get_int(const char *section, const char *option, int *value, int def);
int config_get_strings(const char *section_str, const char *option,
int (*callback)(const char *value, void *privdata),
void *privdata);
struct strtoken {
int count;
char *field[0];
};
struct strtoken * strtokenize(const char *input, const char *delim, int maxfields);
struct strtoken * config_get_strtoken(const char *section_str, const char *option, const char *delim, int maxfields);
int config_get_strtokens(const char *section_str, const char *option, const char *delim, int maxfields,
int (*callback)(struct strtoken *tokens, void *privdata),
void *privdata);
#endif /* _CONFIG_H_ */

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/***************************************************************************
* Copyright (C) 03/2010 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include "list.h"
#include "logging.h"
#include "event.h"
static LIST_HEAD(event_fd_list);
static LIST_HEAD(event_timeout_list);
struct event_fd {
struct list_head list;
unsigned int flags;
int fd;
int (*read_cb)(int fd, void *privdata);
int (*write_cb)(int fd, void *privdata);
void *read_priv;
void *write_priv;
};
struct event_timeout {
struct list_head list;
unsigned int flags;
struct timeval intervall;
struct timeval nextrun;
int (*callback)(void *privdata);
void *privdata;
};
struct event_fd * event_add_fd(
struct event_fd *entry,
int fd,
int type,
int (*callback)(int fd, void *privdata),
void *privdata)
{
/* check valid filediskriptor */
if (fd < 0 || fd > FD_SETSIZE) {
log_print(LOG_ERROR, "event_add_fd(): invalid fd");
return NULL;
}
/* check valid type (read/write) */
if (!(type & FD_TYPES)) {
log_print(LOG_ERROR, "event_add_fd(): invalid type");
return NULL;
}
/* create new entry */
if (entry == NULL) {
entry = malloc(sizeof(struct event_fd));
if (entry == NULL) {
log_print(LOG_ERROR, "event_add_fd(): out of memory");
return NULL;
}
memset(entry, 0, sizeof(struct event_fd));
entry->flags |= EVENT_NEW;
entry->fd = fd;
/* put it on the list */
list_add_tail(&entry->list, &event_fd_list);
}
if (type & FD_READ) {
entry->flags = (callback != NULL) ? (entry->flags | FD_READ | EVENT_NEW) : (entry->flags & ~FD_READ);
entry->read_cb = callback;
entry->read_priv = privdata;
} else if (type & FD_WRITE) {
entry->flags = (callback != NULL) ? (entry->flags | FD_WRITE | EVENT_NEW) : (entry->flags & ~FD_WRITE);
entry->write_cb = callback;
entry->write_priv = privdata;
}
return entry;
}
int event_get_fd(struct event_fd *entry)
{
return (entry != NULL) ? entry->fd: -1;
}
void event_remove_fd(struct event_fd *entry)
{
/* mark the event as deleted -> remove in select() loop */
entry->flags |= EVENT_DELETE;
}
static void add_timeval(struct timeval *ret, struct timeval *a, struct timeval *b)
{
ret->tv_usec = a->tv_usec + b->tv_usec;
ret->tv_sec = a->tv_sec + b->tv_sec;
if (ret->tv_usec >= 1000000) {
ret->tv_usec -= 1000000;
ret->tv_sec++;
}
}
static void sub_timeval(struct timeval *ret, struct timeval *a, struct timeval *b)
{
ret->tv_usec = a->tv_usec - b->tv_usec;
ret->tv_sec = a->tv_sec - b->tv_sec;
if (ret->tv_usec < 0) {
ret->tv_usec += 1000000;
ret->tv_sec--;
}
}
static int cmp_timeval(struct timeval *a, struct timeval *b)
{
if (a->tv_sec > b->tv_sec)
return -1;
if (a->tv_sec < b->tv_sec)
return 1;
if (a->tv_usec > b->tv_usec)
return -1;
if (a->tv_usec < b->tv_usec)
return 1;
return 0;
}
static void schedule_nextrun(struct event_timeout *entry, struct timeval *now)
{
add_timeval(&entry->nextrun, now, &entry->intervall);
struct event_timeout *search;
list_for_each_entry(search, &event_timeout_list, list) {
if (search->nextrun.tv_sec > entry->nextrun.tv_sec) {
list_add_tail(&entry->list, &search->list);
return;
} else if (search->nextrun.tv_sec == entry->nextrun.tv_sec &&
search->nextrun.tv_usec > entry->nextrun.tv_usec) {
list_add_tail(&entry->list, &search->list);
return;
}
}
list_add_tail(&entry->list, &event_timeout_list);
}
struct event_timeout * event_add_timeout(
struct timeval *timeout,
int (*callback)(void *privdata),
void *privdata)
{
struct event_timeout *entry;
entry = malloc(sizeof(struct event_timeout));
if (entry == NULL) {
log_print(LOG_ERROR, "event_add_timeout(): out of memory");
return NULL;
}
entry->flags = 0;
memcpy(&entry->intervall, timeout, sizeof(entry->intervall));
entry->callback = callback;
entry->privdata = privdata;
struct timeval now;
gettimeofday(&now, NULL);
schedule_nextrun(entry, &now);
return entry;
}
void event_remove_timeout(struct event_timeout *entry)
{
/* mark the event as deleted -> remove in select() loop */
entry->flags |= EVENT_DELETE;
}
int event_loop(int (*pre_select_cb)(int *maxfd, void *readfds, void *writefds, struct timeval *timeout, void *privdata),
int (*post_select_cb)(int retval, void *readfds, void *writefds, void *privdata),
void *privdata)
{
while (1) {
/* default value if no application timeout is present */
struct timeval timeout = {
.tv_sec = 3600,
.tv_usec = 0,
};
if (!list_empty(&event_timeout_list)) {
struct timeval now;
gettimeofday(&now, NULL);
struct event_timeout *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &event_timeout_list, list) {
if (entry->flags & EVENT_DELETE) {
list_del(&entry->list);
free(entry);
continue;
}
/* first timeout not elapsed, exit search (since list is sorted) */
if (cmp_timeval(&entry->nextrun, &now) == -1)
break;
/* remove event from list */
list_del(&entry->list);
/* execute callback, when callback returns 0 -> schedule event again */
if (entry->callback(entry->privdata)) {
free(entry);
} else {
schedule_nextrun(entry, &now);
}
}
if (!list_empty(&event_timeout_list)) {
entry = list_entry(event_timeout_list.next, typeof(*entry), list);
/* calc select() timeout */
sub_timeval(&timeout, &entry->nextrun, &now);
}
}
struct event_fd *entry, *tmp;
int maxfd = -1;
fd_set readfds, writefds;
FD_ZERO(&readfds);
FD_ZERO(&writefds);
list_for_each_entry_safe(entry, tmp, &event_fd_list, list) {
entry->flags &= ~EVENT_NEW;
if (entry->flags & EVENT_DELETE) {
list_del(&entry->list);
free(entry);
continue;
}
if (entry->flags & FD_READ)
FD_SET(entry->fd, &readfds);
if (entry->flags & FD_WRITE)
FD_SET(entry->fd, &writefds);
maxfd = (entry->fd > maxfd) ? entry->fd : maxfd;
}
maxfd++;
/* exit loop if callback returns true */
if (pre_select_cb != NULL && pre_select_cb(&maxfd, (void *)&readfds, (void *)&writefds, &timeout, privdata) != 0)
break;
int retval = select(maxfd, &readfds, &writefds, NULL, &timeout);
if (retval < 0 && errno == EINTR) {
errno = 0;
continue;
} else if (retval < 0) {
log_print(LOG_ERROR, "event_loop(): select():");
continue;
}
/* exit loop if callback returns true */
if (post_select_cb != NULL && post_select_cb(retval, (void *)&readfds, (void *)&writefds, privdata) != 0)
break;
/* timeout */
if (retval == 0)
continue;
list_for_each_entry(entry, &event_fd_list, list) {
if (((entry->flags & (FD_READ | EVENT_NEW)) == FD_READ) && FD_ISSET(entry->fd, &readfds))
if (entry->read_cb(entry->fd, entry->read_priv) != 0)
entry->flags |= EVENT_DELETE;
if (((entry->flags & (FD_WRITE | EVENT_NEW)) == FD_WRITE) && FD_ISSET(entry->fd, &writefds))
if (entry->write_cb(entry->fd, entry->write_priv) != 0)
entry->flags |= EVENT_DELETE;
}
}
return 0;
}

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#ifndef _EVENT_H_
#define _EVENT_H_
#include <sys/time.h>
#define EVENT_NEW 0x1000
#define EVENT_DELETE 0x2000
#define FD_READ 0x0001
#define FD_WRITE 0x0002
#define FD_TYPES (FD_READ | FD_WRITE)
#define event_add_readfd(entry, fd, callback, privdata) \
event_add_fd(entry, fd, FD_READ, callback, privdata)
#define event_add_writefd(entry, fd, callback, privdata) \
event_add_fd(entry, fd, FD_WRITE, callback, privdata)
/* inner details are not visible to external users (TODO: size unknown) */
struct event_fd;
struct event_timeout;
struct event_fd * event_add_fd(
struct event_fd *entry,
int fd,
int type,
int (*callback)(int fd, void *privdata),
void *privdata);
int event_get_fd(struct event_fd *entry);
void event_remove_fd(struct event_fd *entry);
struct event_timeout * event_add_timeout(
struct timeval *timeout,
int (*callback)(void *privdata),
void *privdata);
void event_remove_timeout(struct event_timeout *entry);
int event_loop(int (*pre_select_cb)(int *maxfd, void *readfds, void *writefds, struct timeval *timeout, void *privdata),
int (*post_select_cb)(int retval, void *readfds, void *writefds, void *privdata),
void *privdata);
#endif /* _EVENT_H_ */

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#ifndef _LIST_H_
#define _LIST_H_
/*
* stolen from linux kernel 2.6.11 (http://kernel.org/)
* linux/include/linux/stddef.h (offsetoff)
* linux/include/linux/kernel.h (container_of)
* linux/include/linux/list.h (*list*)
* linux/include/linux/netfilter_ipv4/listhelp.h (LIST_FIND)
*
* modified by Olaf Rempel <razzor@kopf-tisch.de>
*/
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
struct list_head {
struct list_head *next, *prev;
};
#define LIST_HEAD_INIT(name) { &(name), &(name) }
#define LIST_HEAD(name) \
struct list_head name = LIST_HEAD_INIT(name)
#define INIT_LIST_HEAD(ptr) do { \
(ptr)->next = (ptr); (ptr)->prev = (ptr); \
} while (0)
/*
* Insert a new entry between two known consecutive entries.
*
* This is only for internal list manipulation where we know
* the prev/next entries already!
*/
static inline void __list_add(struct list_head *new,
struct list_head *prev,
struct list_head *next)
{
next->prev = new;
new->next = next;
new->prev = prev;
prev->next = new;
}
/*
* list_add - add a new entry
* @new: new entry to be added
* @head: list head to add it after
*
* Insert a new entry after the specified head.
* This is good for implementing stacks.
*/
static inline void list_add(struct list_head *new, struct list_head *head)
{
__list_add(new, head, head->next);
}
/*
* list_add_tail - add a new entry
* @new: new entry to be added
* @head: list head to add it before
*
* Insert a new entry before the specified head.
* This is useful for implementing queues.
*/
static inline void list_add_tail(struct list_head *new, struct list_head *head)
{
__list_add(new, head->prev, head);
}
/*
* Delete a list entry by making the prev/next entries
* point to each other.
*
* This is only for internal list manipulation where we know
* the prev/next entries already!
*/
static inline void __list_del(struct list_head * prev, struct list_head * next)
{
next->prev = prev;
prev->next = next;
}
/*
* list_del - deletes entry from list.
* @entry: the element to delete from the list.
* Note: list_empty on entry does not return true after this, the entry is
* in an undefined state.
*/
static inline void list_del(struct list_head *entry)
{
__list_del(entry->prev, entry->next);
entry->next = NULL;
entry->prev = NULL;
}
/*
* list_del_init - deletes entry from list and reinitialize it.
* entry: the element to delete from the list.
*/
static inline void list_del_init(struct list_head *entry)
{
__list_del(entry->prev, entry->next);
INIT_LIST_HEAD(entry);
}
/*
* list_move - delete from one list and add as another's head
* @list: the entry to move
* @head: the head that will precede our entry
*/
static inline void list_move(struct list_head *list, struct list_head *head)
{
__list_del(list->prev, list->next);
list_add(list, head);
}
/*
* list_move_tail - delete from one list and add as another's tail
* @list: the entry to move
* @head: the head that will follow our entry
*/
static inline void list_move_tail(struct list_head *list,
struct list_head *head)
{
__list_del(list->prev, list->next);
list_add_tail(list, head);
}
/*
* list_empty - tests whether a list is empty
* @head: the list to test.
*/
static inline int list_empty(const struct list_head *head)
{
return head->next == head;
}
static inline void __list_splice(struct list_head *list,
struct list_head *head)
{
struct list_head *first = list->next;
struct list_head *last = list->prev;
struct list_head *at = head->next;
first->prev = head;
head->next = first;
last->next = at;
at->prev = last;
}
/*
* list_splice - join two lists
* @list: the new list to add.
* @head: the place to add it in the first list.
*/
static inline void list_splice(struct list_head *list, struct list_head *head)
{
if (!list_empty(list))
__list_splice(list, head);
}
/*
* list_splice_init - join two lists and reinitialise the emptied list.
* @list: the new list to add.
* @head: the place to add it in the first list.
*
* The list at @list is reinitialised
*/
static inline void list_splice_init(struct list_head *list,
struct list_head *head)
{
if (!list_empty(list)) {
__list_splice(list, head);
INIT_LIST_HEAD(list);
}
}
/*
* list_entry - get the struct for this entry
* @ptr: the &struct list_head pointer.
* @type: the type of the struct this is embedded in.
* @member: the name of the list_struct within the struct.
*/
#define list_entry(ptr, type, member) \
container_of(ptr, type, member)
/*
* list_for_each - iterate over a list
* @pos: the &struct list_head to use as a loop counter.
* @head: the head for your list.
*/
#define list_for_each(pos, head) \
for (pos = (head)->next; pos != (head); pos = pos->next)
/*
* list_for_each_prev - iterate over a list backwards
* @pos: the &struct list_head to use as a loop counter.
* @head: the head for your list.
*/
#define list_for_each_prev(pos, head) \
for (pos = (head)->prev; pos != (head); pos = pos->prev)
/*
* list_for_each_safe - iterate over a list safe against removal of list entry
* @pos: the &struct list_head to use as a loop counter.
* @n: another &struct list_head to use as temporary storage
* @head: the head for your list.
*/
#define list_for_each_safe(pos, n, head) \
for (pos = (head)->next, n = pos->next; pos != (head); \
pos = n, n = pos->next)
/*
* list_for_each_entry - iterate over list of given type
* @pos: the type * to use as a loop counter.
* @head: the head for your list.
* @member: the name of the list_struct within the struct.
*/
#define list_for_each_entry(pos, head, member) \
for (pos = list_entry((head)->next, typeof(*pos), member); \
&pos->member != (head); \
pos = list_entry(pos->member.next, typeof(*pos), member))
/*
* list_for_each_entry_reverse - iterate backwards over list of given type.
* @pos: the type * to use as a loop counter.
* @head: the head for your list.
* @member: the name of the list_struct within the struct.
*/
#define list_for_each_entry_reverse(pos, head, member) \
for (pos = list_entry((head)->prev, typeof(*pos), member); \
&pos->member != (head); \
pos = list_entry(pos->member.prev, typeof(*pos), member))
/*
* list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
* @pos: the type * to use as a loop counter.
* @n: another type * to use as temporary storage
* @head: the head for your list.
* @member: the name of the list_struct within the struct.
*/
#define list_for_each_entry_safe(pos, n, head, member) \
for (pos = list_entry((head)->next, typeof(*pos), member), \
n = list_entry(pos->member.next, typeof(*pos), member); \
&pos->member != (head); \
pos = n, n = list_entry(n->member.next, typeof(*n), member))
/* Return pointer to first true entry, if any, or NULL. A macro
required to allow inlining of cmpfn. */
#define LIST_FIND(head, cmpfn, type, args...) \
({ \
const struct list_head *__i, *__j = NULL; \
\
list_for_each(__i, (head)) \
if (cmpfn((const type)__i , ## args)) { \
__j = __i; \
break; \
} \
(type)__j; \
})
#endif /* _LIST_H_ */

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/***************************************************************************
* Copyright (C) 07/2007 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <stdarg.h>
#include <errno.h>
#include <fcntl.h>
#include "logging.h"
#define BUFSIZE 8192
static FILE *log_fd = NULL;
static int log_prio = LOG_EVERYTIME;
static char *buffer = NULL;
int log_print(int prio, const char *fmt, ...)
{
va_list az;
int len = 0, retval;
if (prio < log_prio)
return 0;
if (buffer == NULL) {
buffer = malloc(BUFSIZE);
if (buffer == NULL) {
fprintf(stderr, "log_print(): out of memory\n");
return -1;
}
}
if (log_fd != NULL) {
time_t tzgr;
time(&tzgr);
len += strftime(buffer, BUFSIZE, "%b %d %H:%M:%S :", localtime(&tzgr));
}
va_start(az, fmt);
len += vsnprintf(buffer + len, BUFSIZE - len, fmt, az);
va_end(az);
if (len < 0 || len >= BUFSIZE) {
errno = 0;
return log_print(LOG_ERROR, "log_print: arguments too long");
}
if (errno) {
len += snprintf(buffer + len, BUFSIZE - len, ": %s", strerror(errno));
errno = 0;
}
retval = fprintf((log_fd ? log_fd : stderr), "%s\n", buffer);
fflush(log_fd);
return retval;
}
void log_close(void)
{
if (buffer) {
free(buffer);
buffer = NULL;
}
if (log_fd) {
fclose(log_fd);
log_fd = NULL;
}
}
int log_init(const char *logfile)
{
if (log_fd != NULL)
log_close();
log_fd = fopen(logfile, "a");
if (log_fd == NULL) {
fprintf(stderr, "log_init(): can not open logfile");
return -1;
}
if (fcntl(fileno(log_fd), F_SETFD, FD_CLOEXEC) < 0) {
fprintf(stderr, "log_init(): fcntl(FD_CLOEXEC)");
return -1;
}
log_prio = LOG_EVERYTIME;
return 0;
}
void log_setprio(int prio)
{
log_prio = prio;
}

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#ifndef _LOGGING_H_
#define _LOGGING_H_
#define LOG_EMERG 0 /* system is unusable */
#define LOG_ALERT 1 /* action must be taken immediately */
#define LOG_CRIT 2 /* critical conditions */
#define LOG_ERR 3 /* error conditions */
#define LOG_WARNING 4 /* warning conditions */
#define LOG_NOTICE 5 /* normal but significant condition */
#define LOG_INFO 6 /* informational */
#define LOG_DEBUG 7 /* debug-level messages */
#define LOG_EVERYTIME LOG_EMERG
#define LOG_ERROR LOG_ERR
#define LOG_WARN LOG_WARNING
int log_init(const char *logfile);
void log_close(void);
void log_setprio(int prio);
int log_print(int prio, const char *fmt, ... );
#endif /* _LOGGING_H_ */

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/***************************************************************************
* Copyright (C) 12/2010 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <signal.h>
#include "configfile.h"
#include "event.h"
#include "logging.h"
#include "pidfile.h"
#include "signals.h"
#define DEFAULT_CONFIG "bcastfwd.conf"
#define DEFAULT_LOGFILE "bcastfwd.log"
#define DEFAULT_PIDFILE "bcastfwd.pid"
int bcast_init(void);
int bcast_close(void);
static struct option opts[] = {
{"config", 1, 0, 'c'},
{"debug", 0, 0, 'd'},
{"help", 0, 0, 'h'},
{0, 0, 0, 0}
};
static int restart_var;
static void trigger_restart(void *privdata)
{
int *restart = (int *)privdata;
*restart = 1;
}
int check_restart(int *maxfd, void *readfds, void *writefds, struct timeval *timeout, void *privdata)
{
int *restart = (int *)privdata;
if (*restart == 1) {
*restart = 0;
return 1;
}
return 0;
}
int main(int argc, char *argv[])
{
char *config = DEFAULT_CONFIG;
int code, arg = 0, debug = 0;
do {
code = getopt_long(argc, argv, "c:dh", opts, &arg);
switch (code) {
case 'c': /* config */
config = optarg;
break;
case 'd': /* debug */
debug = 1;
break;
case 'h': /* help */
printf("Usage: bcastfwd [options]\n"
"Options: \n"
" --config -c configfile use this configfile\n"
" --debug -d do not fork and log to stderr\n"
" --help -h this help\n"
"\n");
exit(0);
break;
case '?': /* error */
exit(1);
break;
default: /* unknown / all options parsed */
break;
}
} while (code != -1);
/* parse config file */
if (config_parse(config) < 0)
exit(1);
if (!debug) {
/* check pidfile */
const char *pidfile = config_get_string("global", "pidfile", DEFAULT_PIDFILE);
if (pidfile_check(pidfile, 1) != 0) {
log_print(LOG_ERROR, "bcastfwd already running");
exit(1);
}
/* start logging */
const char *logfile = config_get_string("global", "logfile", DEFAULT_LOGFILE);
if (log_init(logfile) < 0)
exit(1);
/* zum daemon mutieren */
if (daemon(-1, 0) < 0) {
log_print(LOG_ERROR, "failed to daemonize");
exit(1);
}
/* create pidfile */
if (pidfile_create(pidfile) < 0) {
log_print(LOG_ERROR, "failed to create pidfile %s", pidfile);
exit(1);
}
}
signal_init();
signal_add_callback(SIGHUP, trigger_restart, (void *)&restart_var);
log_print(LOG_EVERYTIME, "bcastfwd started (pid:%d)", getpid());
while (1) {
if (bcast_init())
break;
/* exited on restart / SIGUSR1 */
event_loop(check_restart, NULL, (void *)&restart_var);
bcast_close();
config_free();
if (config_parse(config) < 0)
break;
const char *logfile = config_get_string("global", "logfile", DEFAULT_LOGFILE);
if (!debug && log_init(logfile) < 0)
break;
log_print(LOG_EVERYTIME, "bcastfwd restarted (pid:%d) ", getpid());
}
return 0;
}

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include "logging.h"
int pidfile_create(const char *filename)
{
int fd = open(filename, O_CREAT | O_EXCL | O_RDWR, 0644);
if (fd < 0)
return -1;
char buf[8];
int len = snprintf(buf, sizeof(buf), "%d", getpid());
write(fd, buf, len);
close(fd);
return 0;
}
int pidfile_remove(const char *filename)
{
return unlink(filename);
}
pid_t pidfile_check(const char *filename, int remove_stale)
{
int fd = open(filename, O_RDWR);
if (fd < 0) {
if (errno == ENOENT) {
errno = 0;
return 0;
}
return -1;
}
char buf[9];
int len = read(fd, buf, sizeof(buf) -1);
buf[len] = '\0';
close(fd);
char *tmp;
pid_t pid = strtol(buf, &tmp, 10);
if (len == 0 || tmp == buf)
pid = -1;
/* just return the pid */
if (!remove_stale)
return pid;
/* invalid pid, remove stale file */
if (pid == -1) {
pidfile_remove(filename);
return 0;
}
/* check if pid is still running */
if (kill(pid, 0) == 0 || errno != ESRCH) {
errno = 0;
return pid;
}
errno = 0;
pidfile_remove(filename);
return 0;
}

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#ifndef _PIDFILE_H_
#define _PIDFILE_H_
#include <sys/types.h>
int pidfile_create(const char *filename);
int pidfile_remove(const char *filename);
pid_t pidfile_check(const char *filename, int remove_stale);
#endif // _PIDFILE_H_

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/***************************************************************************
* Copyright (C) 05/2009 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include "event.h"
#include "list.h"
#include "logging.h"
#include "signals.h"
struct signal_entry {
struct list_head list;
int signum;
int deleted;
void (*callback)(void *privdata);
void *privdata;
};
static LIST_HEAD(callback_list);
static int sig_pipe[2];
static void sig_handler(int signal)
{
unsigned char signum = (signal & 0xFF);
write(sig_pipe[1], &signum, 1);
}
int signal_remove_callback(int signum, int type)
{
/* mark all old handler for deletion */
struct signal_entry *search;
list_for_each_entry(search, &callback_list, list) {
if (search->signum == signum)
search->deleted = 1;
}
struct sigaction sig_action;
switch (type) {
case SIG_IGNORE:
sig_action.sa_handler = SIG_IGN;
break;
default:
case SIG_DEFAULT:
sig_action.sa_handler = SIG_DFL;
break;
}
if (sigaction(signum, &sig_action, NULL) < 0) {
log_print(LOG_WARN, "signal_remove_callback(): sigaction()");
return -1;
}
/* trigger remove */
sig_handler(0);
return 0;
}
int signal_add_callback(int signum, void (*callback)(void *privdata), void *privdata)
{
struct signal_entry *entry = malloc(sizeof(struct signal_entry));
if (entry == NULL) {
log_print(LOG_WARN, "signal_add_callback(): out of memory");
return -1;
}
entry->signum = signum;
entry->deleted = 0;
entry->callback = callback;
entry->privdata = privdata;
list_add_tail(&entry->list, &callback_list);
struct sigaction sig_action = {
.sa_handler = sig_handler,
};
if (sigaction(signum, &sig_action, NULL) < 0) {
log_print(LOG_WARN, "signal_add_callback(): sigaction()");
list_del(&entry->list);
free(entry);
return -1;
}
return 0;
}
static int sig_event(int fd, void *privdata)
{
unsigned char signum;
int len = read(fd, &signum, 1);
if (len <= 0) {
log_print(LOG_WARN, "sig_event(): read()");
return -1;
}
struct signal_entry *search, *tmp;
list_for_each_entry_safe(search, tmp, &callback_list, list) {
if (search->deleted) {
list_del(&search->list);
free(search);
continue;
}
if (search->signum == signum)
search->callback(search->privdata);
}
return 0;
}
int signal_init(void)
{
if (pipe(sig_pipe) < 0) {
log_print(LOG_ERROR, "signal_init(): pipe()");
return -1;
}
if (fcntl(sig_pipe[0], F_SETFD, FD_CLOEXEC) < 0) {
log_print(LOG_WARN, "signal_init(): fcntl(FD_CLOEXEC)");
return -1;
}
if (fcntl(sig_pipe[1], F_SETFD, FD_CLOEXEC) < 0) {
log_print(LOG_WARN, "signal_init(): fcntl(FD_CLOEXEC)");
return -1;
}
event_add_readfd(NULL, sig_pipe[0], sig_event, NULL);
return 0;
}

12
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#ifndef _SIGNALS_H
#define _SIGNALS_H
#define SIG_DEFAULT 0x00
#define SIG_IGNORE 0x01
int signal_remove_callback(int signum, int type);
int signal_add_callback(int signum, void (*callback)(void *privdata), void *privdata);
int signal_init(void);
#endif // _SIGNALS_H

117
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/***************************************************************************
* Copyright (C) 07/2007 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; version 2 of the License *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int parse_sockaddr(const char *addr, struct sockaddr_in *sa)
{
char *buf = strdup(addr);
if (buf == NULL)
return -1;
char *tmp;
char *ipstr = strtok_r(buf, ":", &tmp);
if (ipstr == NULL) {
free(buf);
return -2;
}
sa->sin_family = AF_INET;
if (inet_pton(AF_INET, ipstr, &sa->sin_addr) <= 0) {
free(buf);
return -3;
}
char *portstr = strtok_r(NULL, " \r\n", &tmp);
if (portstr == NULL) {
free(buf);
return -4;
}
int port = atoi(portstr);
if (port < 0 || port > 65535) {
free(buf);
return -5;
}
sa->sin_port = htons(port);
free(buf);
return 0;
}
int parse_subnet(const char *addr, struct in_addr *net, struct in_addr *mask)
{
char *buf = strdup(addr);
if (buf == NULL)
return -1;
char *tmp;
char *netstr = strtok_r(buf, "/", &tmp);
if (netstr == NULL) {
free(buf);
return -2;
}
if (inet_pton(AF_INET, netstr, net) <= 0) {
free(buf);
return -3;
}
char *maskstr = strtok_r(NULL, " \r\n", &tmp);
if (maskstr == NULL) {
mask->s_addr = ~0;
} else if (inet_pton(AF_INET, maskstr, mask) <= 0) {
int maskbits = atoi(maskstr);
if (maskbits < 0 || maskbits > 32) {
free(buf);
return -4;
}
mask->s_addr = htonl(~0 << (32 - maskbits));
}
free(buf);
return 0;
}
int get_sockaddr(char *buf, int size, struct sockaddr_in *addr)
{
return snprintf(buf, size, "%s:%d", inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
}
char * get_sockaddr_buf(struct sockaddr_in *addr)
{
static char ret[24];
get_sockaddr(ret, sizeof(ret), addr);
return ret;
}
int same_sockaddr(struct sockaddr_in *a, struct sockaddr_in *b)
{
return !((a->sin_family ^ b->sin_family) |
(a->sin_addr.s_addr ^ b->sin_addr.s_addr) |
(a->sin_port ^ b->sin_port));
}

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#ifndef _SOCKADDR_H_
#define _SOCKADDR_H_
#include <netinet/in.h>
int parse_sockaddr(const char *addr, struct sockaddr_in *sa);
int parse_subnet(const char *addr, struct in_addr *net, struct in_addr *mask);
int get_sockaddr(char *buf, int size, struct sockaddr_in *addr);
char * get_sockaddr_buf(struct sockaddr_in *addr);
int same_sockaddr(struct sockaddr_in *a, struct sockaddr_in *b);
#endif /* _SOCKADDR_H_ */