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Revert Tito's patch to zcip. My bad, David Brownell had objected and I missed

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it...
This commit is contained in:
Rob Landley 2005-05-03 03:28:55 +00:00
parent 8445a9ff99
commit e3752e56a4
3 changed files with 188 additions and 112 deletions
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7
include/libbb.h
View File

@ -43,7 +43,7 @@
#include "config.h"
#ifdef CONFIG_SELINUX
#include <proc_secure.h>
#include <selinux/selinux.h>
#endif
#include "pwd_.h"
@ -425,12 +425,11 @@ extern void change_identity ( const struct passwd *pw );
extern const char *change_identity_e2str ( const struct passwd *pw );
extern void run_shell ( const char *shell, int loginshell, const char *command, const char **additional_args
#ifdef CONFIG_SELINUX
, security_id_t sid
, security_context_t sid
#endif
);
extern int run_parts(char **args, const unsigned char test_mode, char **env);
extern int restricted_shell ( const char *shell );
extern void xsetenv ( const char *key, const char *value );
extern void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw );
extern int correct_password ( const struct passwd *pw );
extern char *pw_encrypt(const char *clear, const char *salt);
@ -461,7 +460,7 @@ typedef struct {
extern procps_status_t * procps_scan(int save_user_arg0
#ifdef CONFIG_SELINUX
, int use_selinux, security_id_t *sid
, int use_selinux, security_context_t *sid
#endif
);
extern unsigned short compare_string_array(const char *string_array[], const char *key);

2
libbb/setup_environment.c
View File

@ -42,7 +42,7 @@
#define DEFAULT_LOGIN_PATH "/bin:/usr/bin"
#define DEFAULT_ROOT_LOGIN_PATH "/usr/sbin:/bin:/usr/bin:/sbin"
void xsetenv ( const char *key, const char *value )
static void xsetenv ( const char *key, const char *value )
{
if ( setenv ( key, value, 1 ))
bb_error_msg_and_die (bb_msg_memory_exhausted);

291
networking/zcip.c
View File

@ -31,12 +31,14 @@
* certainly be used. Its naming is built over multicast DNS.
*/
/* TODO:
- more real-world usage/testing, especially daemon mode
- kernel packet filters to reduce scheduling noise
- avoid silent script failures, especially under load...
- link status monitoring (restart on link-up; stop on link-down)
*/
// #define DEBUG
// TODO:
// - more real-world usage/testing, especially daemon mode
// - kernel packet filters to reduce scheduling noise
// - avoid silent script failures, especially under load...
// - link status monitoring (restart on link-up; stop on link-down)
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
@ -61,12 +63,11 @@
#include <linux/if_packet.h>
#include <linux/sockios.h>
#include "busybox.h"
#include "libbb.h"
struct arp_packet {
struct ether_header hdr;
/* FIXME this part is netinet/if_ether.h "struct ether_arp" */
// FIXME this part is netinet/if_ether.h "struct ether_arp"
struct arphdr arp;
struct ether_addr source_addr;
struct in_addr source_ip;
@ -89,13 +90,29 @@ static const unsigned ANNOUNCE_NUM = 2;
static const unsigned ANNOUNCE_INTERVAL = 2;
static const time_t DEFEND_INTERVAL = 10;
#define ZCIP_VERSION "0.75 (18 April 2005)"
static const unsigned char ZCIP_VERSION[] = "0.75 (18 April 2005)";
static char *prog;
static const struct in_addr null_ip = { 0 };
static const struct ether_addr null_addr = { {0, 0, 0, 0, 0, 0} };
static int verbose = 0;
/*
#ifdef DEBUG
#define DBG(fmt,args...) \
fprintf(stderr, "%s: " fmt , prog , ## args)
#define VDBG(fmt,args...) do { \
if (verbose) fprintf(stderr, "%s: " fmt , prog ,## args); \
} while (0)
#else
#define DBG(fmt,args...) \
do { } while (0)
#define VDBG DBG
#endif /* DEBUG */
/**
* Pick a random link local IP address on 169.254/16, except that
* the first and last 256 addresses are reserved.
*/
@ -111,7 +128,7 @@ pick(struct in_addr *ip)
ip->s_addr = htonl((LINKLOCAL_ADDR + 0x0100) + tmp);
}
/*
/**
* Broadcast an ARP packet.
*/
static int
@ -121,12 +138,12 @@ arp(int fd, struct sockaddr *saddr, int op,
{
struct arp_packet p;
/* ether header */
// ether header
p.hdr.ether_type = htons(ETHERTYPE_ARP);
memcpy(p.hdr.ether_shost, source_addr, ETH_ALEN);
memset(p.hdr.ether_dhost, 0xff, ETH_ALEN);
/* arp request */
// arp request
p.arp.ar_hrd = htons(ARPHRD_ETHER);
p.arp.ar_pro = htons(ETHERTYPE_IP);
p.arp.ar_hln = ETH_ALEN;
@ -137,15 +154,15 @@ arp(int fd, struct sockaddr *saddr, int op,
memcpy(&p.target_addr, target_addr, ETH_ALEN);
memcpy(&p.target_ip, &target_ip, sizeof (p.target_ip));
/* send it */
// send it
if (sendto(fd, &p, sizeof (p), 0, saddr, sizeof (*saddr)) < 0) {
bb_perror_msg("sendto");
perror("sendto");
return -errno;
}
return 0;
}
/*
/**
* Run a script.
*/
static int
@ -155,19 +172,21 @@ run(char *script, char *arg, char *intf, struct in_addr *ip)
char *why;
if (script != NULL) {
VDBG("%s run %s %s\n", intf, script, arg);
if (ip != NULL) {
char *addr = inet_ntoa(*ip);
xsetenv("ip", addr);
setenv("ip", addr, 1);
syslog(LOG_INFO, "%s %s %s", arg, intf, addr);
}
pid = vfork();
if (pid < 0) { /* error */
if (pid < 0) { // error
why = "vfork";
goto bad;
} else if (pid == 0) { /* child */
} else if (pid == 0) { // child
execl(script, script, arg, NULL);
bb_perror_msg_and_die("execl");
perror("execl");
_exit(EXIT_FAILURE);
}
if (waitpid(pid, &status, 0) <= 0) {
@ -175,7 +194,8 @@ run(char *script, char *arg, char *intf, struct in_addr *ip)
goto bad;
}
if (WEXITSTATUS(status) != 0) {
bb_perror_msg("script %s failed, exit=%d", script, WEXITSTATUS(status));
fprintf(stderr, "%s: script %s failed, exit=%d\n",
prog, script, WEXITSTATUS(status));
return -errno;
}
}
@ -187,7 +207,31 @@ bad:
return status;
}
/*
#ifndef NO_BUSYBOX
#include "busybox.h"
#endif
/**
* Print usage information.
*/
static void __attribute__ ((noreturn))
usage(const char *msg)
{
fprintf(stderr, "%s: %s\n", prog, msg);
#ifdef NO_BUSYBOX
fprintf(stderr, "Usage: %s [OPTIONS] ifname script\n"
"\t-f foreground mode (implied by -v)\n"
"\t-q quit after address (no daemon)\n"
"\t-r 169.254.x.x request this address first\n"
"\t-v verbose; show version\n",
prog);
exit(0);
#else
bb_show_usage();
#endif
}
/**
* Return milliseconds of random delay, up to "secs" seconds.
*/
static inline unsigned
@ -196,72 +240,85 @@ ms_rdelay(unsigned secs)
return lrand48() % (secs * 1000);
}
/*
/**
* main program
*/
#define FOREGROUND 1
#define QUIT 2
#define REQUEST 4
#define VERBOSE 8
int
main(int argc, char *argv[])
__attribute__ ((weak, alias ("zcip_main")));
int zcip_main(int argc, char *argv[])
{
char *intf = NULL;
char *script = NULL;
int quit = 0;
int foreground = 0;
char *why;
struct sockaddr saddr;
struct ether_addr addr;
struct in_addr ip = { 0 };
int fd;
int ready = 0;
suseconds_t timeout = 0; /* milliseconds */
suseconds_t timeout = 0; // milliseconds
time_t defend = 0;
unsigned conflicts = 0;
unsigned nprobes = 0;
unsigned nclaims = 0;
unsigned long t;
int t;
bb_opt_complementaly = "vf";
/* parse commandline: prog [options] ifname script */
t = bb_getopt_ulflags(argc, argv, "fqr:v", &why); /* reuse char* why */
argc -= optind;
argv += optind;
if ((t & 0x80000000UL) || (argc < 1) || (argc > 2)) {
bb_show_usage();
// parse commandline: prog [options] ifname script
prog = argv[0];
while ((t = getopt(argc, argv, "fqr:v")) != EOF) {
switch (t) {
case 'f':
foreground = 1;
continue;
case 'q':
quit = 1;
continue;
case 'r':
if (inet_aton(optarg, &ip) == 0
|| (ntohl(ip.s_addr) & IN_CLASSB_NET)
!= LINKLOCAL_ADDR) {
usage("invalid link address");
}
continue;
case 'v':
if (!verbose)
printf("%s: version %s\n", prog, ZCIP_VERSION);
verbose++;
foreground = 1;
continue;
default:
usage("bad option");
}
}
if (t & VERBOSE) {
bb_printf("%s: version %s\n", bb_applet_name, ZCIP_VERSION);
if (optind < argc - 1) {
intf = argv[optind++];
setenv("interface", intf, 1);
script = argv[optind++];
}
if ((t & REQUEST) && (inet_aton(why, &ip) == 0 || (ntohl(ip.s_addr) & IN_CLASSB_NET) != LINKLOCAL_ADDR)) {
bb_perror_msg_and_die("invalid link address");
}
intf = argv[0];
xsetenv("interface", intf);
script = argv[1]; /* Could be NULL ? */
openlog(bb_applet_name, 0, LOG_DAEMON);
if (optind != argc || !intf)
usage("wrong number of arguments");
openlog(prog, 0, LOG_DAEMON);
/* initialize the interface (modprobe, ifup, etc) */
// initialize the interface (modprobe, ifup, etc)
if (run(script, "init", intf, NULL) < 0)
return EXIT_FAILURE;
/* initialize saddr */
// initialize saddr
memset(&saddr, 0, sizeof (saddr));
strncpy(saddr.sa_data, intf, sizeof (saddr.sa_data));
/* open an ARP socket */
// open an ARP socket
if ((fd = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ARP))) < 0) {
why = "open";
fail:
t |= FOREGROUND;
foreground = 1;
goto bad;
}
/* bind to the interface's ARP socket */
// bind to the interface's ARP socket
if (bind(fd, &saddr, sizeof (saddr)) < 0) {
why = "bind";
goto fail;
@ -269,7 +326,7 @@ fail:
struct ifreq ifr;
short seed[3];
/* get the interface's ethernet address */
// get the interface's ethernet address
memset(&ifr, 0, sizeof (ifr));
strncpy(ifr.ifr_name, intf, sizeof (ifr.ifr_name));
if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
@ -278,37 +335,37 @@ fail:
}
memcpy(&addr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
/* start with some stable ip address, either a function of
the hardware address or else the last address we used.
NOTE: the sequence of addresses we try changes only
depending on when we detect conflicts. */
// start with some stable ip address, either a function of
// the hardware address or else the last address we used.
// NOTE: the sequence of addresses we try changes only
// depending on when we detect conflicts.
memcpy(seed, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
seed48(seed);
if (ip.s_addr == 0)
pick(&ip);
}
/* FIXME cases to handle:
- zcip already running!
- link already has local address... just defend/update */
// FIXME cases to handle:
// - zcip already running!
// - link already has local address... just defend/update
/* daemonize now; don't delay system startup */
if (!(t & FOREGROUND)) {
if (daemon(0, (t & VERBOSE)) < 0) {
// daemonize now; don't delay system startup
if (!foreground) {
if (daemon(0, verbose) < 0) {
why = "daemon";
goto bad;
}
syslog(LOG_INFO, "start, interface %s", intf);
}
/* run the dynamic address negotiation protocol,
restarting after address conflicts:
- start with some address we want to try
- short random delay
- arp probes to see if another host else uses it
- arp announcements that we're claiming it
- use it
- defend it, within limits */
// run the dynamic address negotiation protocol,
// restarting after address conflicts:
// - start with some address we want to try
// - short random delay
// - arp probes to see if another host else uses it
// - arp announcements that we're claiming it
// - use it
// - defend it, within limits
while (1) {
struct pollfd fds[1];
struct timeval tv1;
@ -318,7 +375,7 @@ fail:
fds[0].events = POLLIN;
fds[0].revents = 0;
/* poll, being ready to adjust current timeout */
// poll, being ready to adjust current timeout
if (timeout > 0) {
gettimeofday(&tv1, NULL);
tv1.tv_usec += (timeout % 1000) * 1000;
@ -329,17 +386,21 @@ fail:
tv1.tv_sec += timeout / 1000;
} else if (timeout == 0) {
timeout = ms_rdelay(PROBE_WAIT);
/* FIXME setsockopt(fd, SO_ATTACH_FILTER, ...) to
make the kernel filter out all packets except
ones we'd care about. */
// FIXME setsockopt(fd, SO_ATTACH_FILTER, ...) to
// make the kernel filter out all packets except
// ones we'd care about.
}
VDBG("...wait %ld %s nprobes=%d, nclaims=%d\n",
timeout, intf, nprobes, nclaims);
switch (poll(fds, 1, timeout)) {
/* timeouts trigger protocol transitions */
// timeouts trigger protocol transitions
case 0:
/* probes */
// probes
if (nprobes < PROBE_NUM) {
nprobes++;
VDBG("probe/%d %s@%s\n",
nprobes, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
&addr, null_ip,
&null_addr, ip);
@ -350,36 +411,38 @@ fail:
} else
timeout = ANNOUNCE_WAIT * 1000;
}
/* then announcements */
// then announcements
else if (nclaims < ANNOUNCE_NUM) {
nclaims++;
VDBG("announce/%d %s@%s\n",
nclaims, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
&addr, ip,
&addr, ip);
if (nclaims < ANNOUNCE_NUM) {
timeout = ANNOUNCE_INTERVAL * 1000;
} else {
/* link is ok to use earlier */
// link is ok to use earlier
run(script, "config", intf, &ip);
ready = 1;
conflicts = 0;
timeout = -1;
/* NOTE: all other exit paths
should deconfig ... */
if (t & QUIT)
// NOTE: all other exit paths
// should deconfig ...
if (quit)
return EXIT_SUCCESS;
/* FIXME update filters */
// FIXME update filters
}
}
break;
/* packets arriving */
// packets arriving
case 1:
/* maybe adjust timeout */
// maybe adjust timeout
if (timeout > 0) {
struct timeval tv2;
gettimeofday(&tv2, NULL);
if (timercmp(&tv1, &tv2, <)) {
timeout = -1;
@ -391,33 +454,46 @@ fail:
}
if ((fds[0].revents & POLLIN) == 0) {
if (fds[0].revents & POLLERR) {
/* FIXME: links routinely go down;
this shouldn't necessarily exit. */
bb_perror_msg("%s: poll error", intf);
// FIXME: links routinely go down;
// this shouldn't necessarily exit.
fprintf(stderr, "%s %s: poll error\n",
prog, intf);
if (ready) {
run(script, "deconfig", intf, &ip);
run(script, "deconfig",
intf, &ip);
}
return EXIT_FAILURE;
}
continue;
}
/* read ARP packet */
// read ARP packet
if (recv(fd, &p, sizeof (p), 0) < 0) {
why = "recv";
goto bad;
}
if (p.hdr.ether_type != htons(ETHERTYPE_ARP))
continue;
VDBG("%s recv arp type=%d, op=%d,\n",
intf, ntohs(p.hdr.ether_type),
ntohs(p.arp.ar_op));
VDBG("\tsource=%s %s\n",
ether_ntoa(&p.source_addr),
inet_ntoa(p.source_ip));
VDBG("\ttarget=%s %s\n",
ether_ntoa(&p.target_addr),
inet_ntoa(p.target_ip));
if (p.arp.ar_op != htons(ARPOP_REQUEST)
&& p.arp.ar_op != htons(ARPOP_REPLY))
continue;
/* some cases are always conflicts */
// some cases are always conflicts
if ((p.source_ip.s_addr == ip.s_addr)
&& (memcmp(&addr, &p.source_addr,
ETH_ALEN) != 0)) {
collision:
VDBG("%s ARP conflict from %s\n", intf,
ether_ntoa(&p.source_addr));
if (ready) {
time_t now = time(0);
@ -428,26 +504,28 @@ collision:
ARPOP_REQUEST,
&addr, ip,
&addr, ip);
VDBG("%s defend\n", intf);
timeout = -1;
continue;
}
defend = now;
ready = 0;
run(script, "deconfig", intf, &ip);
/* FIXME rm filters: setsockopt(fd,
SO_DETACH_FILTER, ...) */
// FIXME rm filters: setsockopt(fd,
// SO_DETACH_FILTER, ...)
}
conflicts++;
if (conflicts >= MAX_CONFLICTS) {
VDBG("%s ratelimit\n", intf);
sleep(RATE_LIMIT_INTERVAL);
}
/* restart the whole protocol */
// restart the whole protocol
pick(&ip);
timeout = 0;
nprobes = 0;
nclaims = 0;
}
/* two hosts probing one address is a collision too */
// two hosts probing one address is a collision too
else if (p.target_ip.s_addr == ip.s_addr
&& nclaims == 0
&& p.arp.ar_op == htons(ARPOP_REQUEST)
@ -463,11 +541,10 @@ collision:
}
}
bad:
if ( t & FOREGROUND) {
bb_perror_msg(why);
} else {
if (foreground)
perror(why);
else
syslog(LOG_ERR, "%s %s, %s error: %s",
bb_applet_name, intf, why, strerror(errno));
}
prog, intf, why, strerror(errno));
return EXIT_FAILURE;
}