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Clean up udhcpd a bit. Constify. Staticize. Remove these functions and

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inline their contents: print_usage, pidfile_delete, and background.
This commit is contained in:
Aaron Lehmann 2002-08-21 11:21:19 +00:00
parent 8eb0dc1d10
commit 1ff58b6570
1 changed files with 54 additions and 66 deletions
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120
networking/udhcpc.c
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@ -248,7 +248,7 @@ struct udp_dhcp_packet {
struct dhcpMessage data;
};
struct dhcp_option options[] = {
static const struct dhcp_option options[] = {
/* name[10] flags code */
{"subnet", OPTION_IP | OPTION_REQ, 0x01},
{"timezone", OPTION_S32, 0x02},
@ -280,7 +280,7 @@ struct dhcp_option options[] = {
};
/* Lengths of the different option types */
int option_lengths[] = {
static const int option_lengths[] = {
[OPTION_IP] = 4,
[OPTION_IP_PAIR] = 8,
[OPTION_BOOLEAN] = 1,
@ -293,7 +293,7 @@ int option_lengths[] = {
};
/* get a rough idea of how long an option will be (rounding up...) */
static int max_option_length[] = {
static const unsigned char max_option_length[] = {
[OPTION_IP] = sizeof("255.255.255.255 "),
[OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2,
[OPTION_STRING] = 1,
@ -305,26 +305,8 @@ static int max_option_length[] = {
[OPTION_S32] = sizeof("-2147483684 "),
};
static void print_usage(void)
{
printf(
"Usage: udhcpcd [OPTIONS]\n\n"
" -c, --clientid=CLIENTID Client identifier\n"
" -H, --hostname=HOSTNAME Client hostname\n"
" -f, --foreground Do not fork after getting lease\n"
" -i, --interface=INTERFACE Interface to use (default: eth0)\n"
" -n, --now Exit with failure if lease cannot be\n"
" immediately negotiated.\n"
" -p, --pidfile=file Store process ID of daemon in file\n"
" -q, --quit Quit after obtaining lease\n"
" -r, --request=IP IP address to request (default: none)\n"
" -s, --script=file Run file at dhcp events (default:\n"
" " DEFAULT_SCRIPT ")\n"
" -v, --version Display version\n"
);
}
/* return the position of the 'end' option (no bounds checking) */
int end_option(unsigned char *optionptr)
static int end_option(unsigned char *optionptr)
{
int i = 0;
@ -337,7 +319,7 @@ int end_option(unsigned char *optionptr)
/* add an option string to the options (an option string contains an option code,
* length, then data) */
int add_option_string(unsigned char *optionptr, unsigned char *string)
static int add_option_string(unsigned char *optionptr, unsigned char *string)
{
int end = end_option(optionptr);
@ -353,7 +335,7 @@ int add_option_string(unsigned char *optionptr, unsigned char *string)
}
/* add a one to four byte option to a packet */
int add_simple_option(unsigned char *optionptr, unsigned char code, u_int32_t data)
static int add_simple_option(unsigned char *optionptr, unsigned char code, u_int32_t data)
{
char length = 0;
int i;
@ -411,7 +393,7 @@ void init_header(struct dhcpMessage *packet, char type)
add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
}
#endif
u_int16_t checksum(void *addr, int count)
static u_int16_t checksum(void *addr, int count)
{
/* Compute Internet Checksum for "count" bytes
* beginning at location "addr".
@ -437,7 +419,7 @@ u_int16_t checksum(void *addr, int count)
}
/* Constuct a ip/udp header for a packet, and specify the source and dest hardware address */
int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
static int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
u_int32_t dest_ip, int dest_port, unsigned char *dest_arp, int ifindex)
{
int l_fd;
@ -489,7 +471,7 @@ int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port
}
/* Let the kernel do all the work for packet generation */
int kernel_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
static int kernel_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
u_int32_t dest_ip, int dest_port)
{
int n = 1;
@ -576,7 +558,7 @@ static void add_requests(struct dhcpMessage *packet)
}
/* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
int send_discover(unsigned long xid, unsigned long requested)
static int send_discover(unsigned long xid, unsigned long requested)
{
struct dhcpMessage packet;
@ -592,7 +574,7 @@ int send_discover(unsigned long xid, unsigned long requested)
}
/* Broadcasts a DHCP request message */
int send_selecting(unsigned long xid, unsigned long server, unsigned long requested)
static int send_selecting(unsigned long xid, unsigned long server, unsigned long requested)
{
struct dhcpMessage packet;
struct in_addr addr;
@ -612,7 +594,7 @@ int send_selecting(unsigned long xid, unsigned long server, unsigned long reques
/* Unicasts or broadcasts a DHCP renew message */
int send_renew(unsigned long xid, unsigned long server, unsigned long ciaddr)
static int send_renew(unsigned long xid, unsigned long server, unsigned long ciaddr)
{
struct dhcpMessage packet;
int ret = 0;
@ -631,7 +613,7 @@ int send_renew(unsigned long xid, unsigned long server, unsigned long ciaddr)
}
/* Create a random xid */
unsigned long random_xid(void)
static unsigned long random_xid(void)
{
static int initialized;
if (!initialized) {
@ -691,7 +673,7 @@ static void renew_requested(int sig)
}
/* get an option with bounds checking (warning, not aligned). */
unsigned char *get_option(struct dhcpMessage *packet, int code)
static unsigned char *get_option(struct dhcpMessage *packet, int code)
{
int i, length;
unsigned char *optionptr;
@ -757,7 +739,7 @@ static int sprintip(char *dest, char *pre, unsigned char *ip) {
/* Fill dest with the text of option 'option'. */
static void fill_options(char *dest, unsigned char *option, struct dhcp_option *type_p)
static void fill_options(char *dest, unsigned char *option, const struct dhcp_option *type_p)
{
int type, optlen;
u_int16_t val_u16;
@ -891,7 +873,7 @@ static char **fill_envp(struct dhcpMessage *packet)
}
/* Call a script with a par file and env vars */
void run_script(struct dhcpMessage *packet, const char *name)
static void run_script(struct dhcpMessage *packet, const char *name)
{
int pid;
char **envp;
@ -946,7 +928,7 @@ static void release_requested(int sig)
}
int pidfile_acquire(char *pidfile)
static int pidfile_acquire(char *pidfile)
{
int pid_fd;
if (pidfile == NULL) return -1;
@ -963,7 +945,7 @@ int pidfile_acquire(char *pidfile)
}
void pidfile_write_release(int pid_fd)
static void pidfile_write_release(int pid_fd)
{
FILE *out;
@ -977,16 +959,11 @@ void pidfile_write_release(int pid_fd)
close(pid_fd);
}
void pidfile_delete(char *pidfile)
{
if (pidfile) unlink(pidfile);
}
/* Exit and cleanup */
static void exit_client(int retval)
{
pidfile_delete(client_config.pidfile);
unlink(client_config.pidfile);
if (client_config.pidfile) unlink(client_config.pidfile);
CLOSE_LOG();
exit(retval);
}
@ -1001,23 +978,7 @@ static void terminate(int sig)
}
static void background(void)
{
int pid_fd;
if (client_config.quit_after_lease) {
exit_client(0);
} else if (!client_config.foreground) {
pid_fd = pidfile_acquire(client_config.pidfile); /* hold lock during fork. */
if (daemon(0, 0) == -1) {
perror("fork");
exit_client(1);
}
client_config.foreground = 1; /* Do not fork again. */
pidfile_write_release(pid_fd);
}
}
int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp)
static int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp)
{
int l_fd;
struct ifreq ifr;
@ -1063,7 +1024,7 @@ int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char
}
int listen_socket(unsigned int ip, int port, char *inf)
static int listen_socket(unsigned int ip, int port, char *inf)
{
struct ifreq interface;
int l_fd;
@ -1105,7 +1066,7 @@ int listen_socket(unsigned int ip, int port, char *inf)
}
int raw_socket(int ifindex)
static int raw_socket(int ifindex)
{
int l_fd;
struct sockaddr_ll sock;
@ -1130,7 +1091,7 @@ int raw_socket(int ifindex)
}
/* read a packet from socket fd, return -1 on read error, -2 on packet error */
int get_packet(struct dhcpMessage *packet, int l_fd)
static int get_packet(struct dhcpMessage *packet, int l_fd)
{
int bytes;
int i;
@ -1168,7 +1129,7 @@ int get_packet(struct dhcpMessage *packet, int l_fd)
return bytes;
}
int get_raw_packet(struct dhcpMessage *payload, int l_fd)
static int get_raw_packet(struct dhcpMessage *payload, int l_fd)
{
int bytes;
struct udp_dhcp_packet packet;
@ -1298,7 +1259,21 @@ int udhcpc_main(int argc, char *argv[])
strncpy(client_config.hostname + 2, optarg, len);
break;
case 'h':
print_usage();
puts(
"Usage: udhcpcd [OPTIONS]\n\n"
" -c, --clientid=CLIENTID Client identifier\n"
" -H, --hostname=HOSTNAME Client hostname\n"
" -f, --foreground Do not fork after getting lease\n"
" -i, --interface=INTERFACE Interface to use (default: eth0)\n"
" -n, --now Exit with failure if lease cannot be\n"
" immediately negotiated.\n"
" -p, --pidfile=file Store process ID of daemon in file\n"
" -q, --quit Quit after obtaining lease\n"
" -r, --request=IP IP address to request (default: none)\n"
" -s, --script=file Run file at dhcp events (default:\n"
" " DEFAULT_SCRIPT ")\n"
" -v, --version Display version"
);
return 0;
case 'i':
client_config.interface = optarg;
@ -1538,7 +1513,20 @@ int udhcpc_main(int argc, char *argv[])
state = BOUND;
change_mode(LISTEN_NONE);
background();
{
int pid_fd2;
if (client_config.quit_after_lease) {
exit_client(0);
} else if (!client_config.foreground) {
pid_fd2 = pidfile_acquire(client_config.pidfile); /* hold lock during fork. */
if (daemon(0, 0) == -1) {
perror("fork");
exit_client(1);
}
client_config.foreground = 1; /* Do not fork again. */
pidfile_write_release(pid_fd2);
}
}
}
else if (*message == DHCPNAK) {
/* return to init state */