int fd_copy2 (int to1, int from1, int to2, int from2)
{
if ((to1 == from2) || (to2 == from1)) return (errno = EINVAL, -1) ;
if (fd_copy(to1, from1) == -1) return -1 ;
if (fd_copy(to2, from2) == -1)
{
if (to1 != from1) fd_close(to1) ;
return -1 ;
}
return 0 ;
}
int setup_log()
{
if ((rploglen =str_len(rplog)) < 7)
{
warn3x("log must have at least seven characters.", 0, 0);
return(0);
}
if (pipe(logpipe) == -1)
{
warn3x("unable to create pipe for log.", 0, 0);
return(-1);
}
coe(logpipe[1]);
coe(logpipe[0]);
ndelay_on(logpipe[0]);
ndelay_on(logpipe[1]);
if (fd_copy(2, logpipe[1]) == -1)
{
warn3x("unable to set filedescriptor for log.", 0, 0);
return(-1);
}
io[0].fd =logpipe[0];
io[0].events =IOPAUSE_READ;
taia_now(&stamplog);
return(1);
}
void
parse_region (int fd, UINT size)
{
struct region region;
readall (fd, ®ion, sizeof(region));
region_count++;
app_record_count++;
if (options.print) {
printf ("Region Record %d:\n", region_count);
printf (" ID: %d (0x%04x)\n", region.id, region.id);
printf (" Delay: %u\n", region.delay);
printf (" Size: ");
if (options.human_readable)
print_human_readable (region.size);
else
printf("%u", region.size);
printf("\n");
}
if (options.extract == region_count) {
fd_copy (1, fd, region.size);
options.extract = -1;
}
else {
lseek (fd, region.size, SEEK_CUR);
}
}
pid_t child_spawn1_internal (char const *prog, char const *const *argv, char const *const *envp, int *p, int to)
{
int e ;
int syncp[2] ;
pid_t pid ;
if (coe(p[0]) < 0 || pipecoe(syncp) < 0)
{
e = errno ;
fd_close(p[1]) ;
fd_close(p[0]) ;
errno = e ;
return 0 ;
}
pid = fork() ;
if (pid < 0)
{
e = errno ;
fd_close(syncp[1]) ;
fd_close(syncp[0]) ;
fd_close(p[1]) ;
fd_close(p[0]) ;
errno = e ;
return 0 ;
}
if (!pid)
{
fd_close(syncp[0]) ;
fd_close(p[!(to & 1)]) ;
if (fd_move(to & 1, p[to & 1]) < 0) goto err ;
if ((to & 2) && (fd_copy(!(to & 1), to & 1) < 0)) goto err ;
sig_blocknone() ;
pathexec_run(prog, argv, envp) ;
err:
e = errno ;
fd_write(syncp[1], (char *)&e, sizeof(e)) ;
_exit(127) ;
}
fd_close(syncp[1]) ;
fd_close(p[to & 1]) ;
syncp[1] = fd_read(syncp[0], (char *)&e, sizeof(e)) ;
if (syncp[1] < 0)
{
e = errno ;
fd_close(syncp[0]) ;
fd_close(p[!(to & 1)]) ;
errno = e ;
return 0 ;
}
fd_close(syncp[0]) ;
if (syncp[1] == sizeof(e))
{
fd_close(p[!(to & 1)]) ;
wait_pid(pid, &syncp[1]) ;
errno = e ;
return 0 ;
}
return pid ;
}
int fd_move( int to, int from)
{
if (to == from)
return 0;
if (fd_copy(to, from) == -1)
return -1;
close(from);
return 0;
}
int main(int argc,char **argv)
{
if (chdir("/") == -1) die(errno);
umask(077);
if (prot_gid(auto_gidq) == -1) die(errno);
if (fd_copy(2,0) == -1) die(errno);
if (fd_copy(3,0) == -1) die(errno);
if (fd_copy(4,0) == -1) die(errno);
if (fd_copy(5,0) == -1) die(errno);
if (fd_copy(6,0) == -1) die(errno);
if (argv[1]) {
qlargs[1] = argv[1];
++argv;
}
if (argv[1]) {
if (pipe(pi0) == -1) die(errno);
switch(fork()) {
case -1: die(errno);
case 0:
if (prot_gid(auto_gidn) == -1) die(errno);
if (prot_uid(auto_uidl) == -1) die(errno);
close(pi0[1]);
if (fd_move(0,pi0[0]) == -1) die(errno);
close23456();
execvp(argv[1],argv + 1);
die(errno);
}
close(pi0[0]);
if (fd_move(1,pi0[1]) == -1) die(errno);
}
if (pipe(pi1) == -1) die(errno);
if (pipe(pi2) == -1) die(errno);
if (pipe(pi3) == -1) die(errno);
if (pipe(pi4) == -1) die(errno);
if (pipe(pi5) == -1) die(errno);
if (pipe(pi6) == -1) die(errno);
/* start qmail-lspawn */
switch(fork()) {
case -1: die(errno);
case 0:
if (fd_copy(0,pi1[0]) == -1) die(errno);
if (fd_copy(1,pi2[1]) == -1) die(errno);
close23456();
closepipes();
execvp(*qlargs,qlargs);
die(errno);
}
/* start qmail-rspawn */
switch(fork()) {
case -1: die(errno);
case 0:
if (prot_uid(auto_uidr) == -1) die(errno);
if (fd_copy(0,pi3[0]) == -1) die(errno);
if (fd_copy(1,pi4[1]) == -1) die(errno);
close23456();
closepipes();
execvp(*qrargs,qrargs);
die(errno);
}
/* start qmail-clean */
switch(fork()) {
case -1: die(errno);
case 0:
if (prot_uid(auto_uidq) == -1) die(errno);
if (fd_copy(0,pi5[0]) == -1) die(errno);
if (fd_copy(1,pi6[1]) == -1) die(errno);
close23456();
closepipes();
execvp(*qcargs,qcargs);
die(errno);
}
if (prot_uid(auto_uids) == -1) die(errno);
if (fd_copy(0,1) == -1) die(errno);
if (fd_copy(1,pi1[1]) == -1) die(errno);
if (fd_copy(2,pi2[0]) == -1) die(errno);
if (fd_copy(3,pi3[1]) == -1) die(errno);
if (fd_copy(4,pi4[0]) == -1) die(errno);
if (fd_copy(5,pi5[1]) == -1) die(errno);
if (fd_copy(6,pi6[0]) == -1) die(errno);
closepipes();
execvp(*qsargs,qsargs); /* start qmail-send */
die(errno);
return(0); /* never reached */
}
void doit(int t) {
int fakev4=0;
int j;
SSL *ssl;
int wstat;
uint32 scope_id;
int sslctl[2];
char *s;
unsigned long tmp_long;
char sslctl_cmd;
stralloc ssl_env = { 0 };
buffer ssl_env_buf;
if (pipe(pi) == -1) strerr_die2sys(111,DROP,"unable to create pipe: ");
if (pipe(po) == -1) strerr_die2sys(111,DROP,"unable to create pipe: ");
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sslctl) == -1) strerr_die2sys(111,DROP,"unable to create socketpair: ");
switch(fork()) {
case -1:
strerr_die2sys(111,DROP,"unable to fork: ");
case 0:
/* Child */
break;
default:
/* Parent */
close(pi[0]); close(po[1]); close(sslctl[1]);
if ((s=env_get("SSL_CHROOT")))
if (chroot(s) == -1)
strerr_die2x(111,DROPSSL,"unable to chroot");
if ((s=env_get("SSL_GID"))) {
scan_ulong(s,&tmp_long);
gid = tmp_long;
}
if (gid) if (prot_gid(gid) == -1) strerr_die2sys(111,DROPSSL,"unable to set gid: ");
if ((s=env_get("SSL_UID"))) {
scan_ulong(s,&tmp_long);
uid = tmp_long;
}
if (uid) if (prot_uid(uid) == -1)
strerr_die2sys(111,DROPSSL,"unable to set uid: ");
/* This will exit on a fatal error or if the client quits
* without activating SSL
*/
sslctl_cmd = ucspitls_master_wait_for_activation(sslctl[0]);
/* If we got here, SSL must have been activated */
ssl = ssl_new(ctx,t);
if (!ssl) strerr_die2x(111,DROP,"unable to create SSL instance");
if (ndelay_on(t) == -1)
strerr_die2sys(111,DROP,"unable to set socket options: ");
if (ssl_timeoutaccept(ssl,ssltimeout) == -1)
strerr_die3x(111,DROP,"unable to accept SSL: ",ssl_error_str(ssl_errno));
if (verbosity >= 2) {
strnum[fmt_ulong(strnum,getpid())] = 0;
strerr_warn3("sslserver: ssl ",strnum," accept ",0);
}
if (flagclientcert) {
switch(ssl_verify(ssl,verifyhost)) {
case -1:
strerr_die2x(111,DROP,"unable to verify client certificate");
case -2:
strerr_die2x(111,DROP,"no client certificate");
case -3:
strerr_die2x(111,DROP,"client name does not match certificate");
default: break;
}
}
if (sslctl_cmd == 'Y') {
ssl_server_env(ssl, &ssl_env);
stralloc_0(&ssl_env); /* Add another NUL */
buffer_init(&ssl_env_buf,buffer_unixwrite,sslctl[0],NULL,0);
if (buffer_putflush(&ssl_env_buf, ssl_env.s, ssl_env.len) == -1) {
strerr_die2sys(111, FATAL, "unable to write SSL environment: ");
}
} else if (sslctl_cmd != 'y') {
strerr_die2x(111,DROP,"Protocol error on SSL control descriptor: invalid command character read");
}
if (close(sslctl[0]) != 0) {
strerr_die2sys(111, DROP, "Error closing SSL control socket: ");
}
if (ssl_io(ssl,pi[1],po[0],io_opt) != 0)
strerr_die3x(111,DROP,"unable to speak SSL: ",ssl_error_str(ssl_errno));
if (wait_nohang(&wstat) > 0)
_exit(wait_exitcode(wstat));
ssl_close(ssl);
_exit(0);
}
/* Child-only below this point */
if (close(sslctl[0]) != 0) {
strerr_die2sys(111, DROP, "Error closing SSL control socket: ");
}
if (!forcev6 && ip6_isv4mapped(remoteip))
fakev4=1;
if (fakev4)
remoteipstr[ip4_fmt(remoteipstr,remoteip+12)] = 0;
else
remoteipstr[ip6_fmt(remoteipstr,remoteip)] = 0;
if (verbosity >= 2) {
strnum[fmt_ulong(strnum,getpid())] = 0;
strerr_warn4("sslserver: pid ",strnum," from ",remoteipstr,0);
}
if (socket_local6(t,localip,&localport,&scope_id) == -1)
strerr_die2sys(111,DROP,"unable to get local address: ");
if (fakev4)
localipstr[ip4_fmt(localipstr,localip+12)] = 0;
else
localipstr[ip6_fmt(localipstr,localip)] = 0;
remoteportstr[fmt_ulong(remoteportstr,remoteport)] = 0;
if (!localhost)
if (dns_name6(&localhostsa,localip) == 0)
if (localhostsa.len) {
if (!stralloc_0(&localhostsa)) drop_nomem();
localhost = localhostsa.s;
}
env("PROTO",fakev4?"SSL":"SSL6");
env("SSLLOCALIP",localipstr);
env("SSL6LOCALIP",localipstr);
env("SSLLOCALPORT",localportstr);
env("SSL6LOCALPORT",localportstr);
env("SSLLOCALHOST",localhost);
env("SSL6LOCALHOST",localhost);
if (!fakev4 && scope_id)
env("SSL6INTERFACE",socket_getifname(scope_id));
if (flagtcpenv) {
env("TCPLOCALIP",localipstr);
env("TCP6LOCALIP",localipstr);
env("TCPLOCALPORT",localportstr);
env("TCP6LOCALPORT",localportstr);
env("TCPLOCALHOST",localhost);
env("TCP6LOCALHOST",localhost);
if (!fakev4 && scope_id)
env("TCP6INTERFACE",socket_getifname(scope_id));
}
if (flagremotehost)
if (dns_name6(&remotehostsa,remoteip) == 0)
if (remotehostsa.len) {
if (flagparanoid) {
verifyhost = remoteipstr;
if (dns_ip6(&tmp,&remotehostsa) == 0)
for (j = 0;j + 16 <= tmp.len;j += 16)
if (byte_equal(remoteip,16,tmp.s + j)) {
flagparanoid = 0;
break;
}
}
if (!flagparanoid) {
if (!stralloc_0(&remotehostsa)) drop_nomem();
remotehost = remotehostsa.s;
verifyhost = remotehostsa.s;
}
}
env("SSLREMOTEIP",remoteipstr);
env("SSL6REMOTEIP",remoteipstr);
remoteipstr[ip6_fmt(remoteipstr,remoteip)]=0;
env("SSLREMOTEPORT",remoteportstr);
env("SSL6REMOTEPORT",remoteportstr);
env("SSLREMOTEHOST",remotehost);
env("SSL6REMOTEHOST",remotehost);
if (flagtcpenv) {
env("TCPREMOTEIP",remoteipstr);
env("TCP6REMOTEIP",remoteipstr);
env("TCPREMOTEPORT",remoteportstr);
env("TCP6REMOTEPORT",remoteportstr);
env("TCPREMOTEHOST",remotehost);
env("TCP6REMOTEHOST",remotehost);
}
if (flagremoteinfo) {
if (remoteinfo6(&tcpremoteinfo,remoteip,remoteport,localip,localport,timeout,netif) == -1)
flagremoteinfo = 0;
if (!stralloc_0(&tcpremoteinfo)) drop_nomem();
}
env("SSLREMOTEINFO",flagremoteinfo ? tcpremoteinfo.s : 0);
env("SSL6REMOTEINFO",flagremoteinfo ? tcpremoteinfo.s : 0);
if (flagtcpenv) {
env("TCPREMOTEINFO",flagremoteinfo ? tcpremoteinfo.s : 0);
env("TCP6REMOTEINFO",flagremoteinfo ? tcpremoteinfo.s : 0);
}
if (fnrules) {
int fdrules;
fdrules = open_read(fnrules);
if (fdrules == -1) {
if (errno != error_noent) drop_rules();
if (!flagallownorules) drop_rules();
}
else {
int fakev4=0;
char* temp;
if (!forcev6 && ip6_isv4mapped(remoteip))
fakev4=1;
if (fakev4)
temp=remoteipstr+7;
else
temp=remoteipstr;
if (rules(found,fdrules,temp,remotehost,flagremoteinfo ? tcpremoteinfo.s : 0) == -1) drop_rules();
close(fdrules);
}
}
if (verbosity >= 2) {
strnum[fmt_ulong(strnum,getpid())] = 0;
if (!stralloc_copys(&tmp,"sslserver: ")) drop_nomem();
safecats(flagdeny ? "deny" : "ok");
cats(" "); safecats(strnum);
cats(" "); if (localhost) safecats(localhost);
cats(":"); safecats(localipstr);
cats(":"); safecats(localportstr);
cats(" "); if (remotehost) safecats(remotehost);
cats(":"); safecats(remoteipstr);
cats(":"); if (flagremoteinfo) safecats(tcpremoteinfo.s);
cats(":"); safecats(remoteportstr);
cats("\n");
buffer_putflush(buffer_2,tmp.s,tmp.len);
}
if (flagdeny) _exit(100);
if (gid) if (prot_gid(gid) == -1)
strerr_die2sys(111,FATAL,"unable to set gid: ");
if (uid) if (prot_uid(uid) == -1)
strerr_die2sys(111,FATAL,"unable to set uid: ");
close(pi[1]); close(po[0]);
sig_uncatch(sig_child);
sig_unblock(sig_child);
sig_uncatch(sig_term);
sig_uncatch(sig_pipe);
if (fcntl(sslctl[1],F_SETFD,0) == -1)
strerr_die2sys(111,FATAL,"unable to clear close-on-exec flag");
strnum[fmt_ulong(strnum,sslctl[1])]=0;
setenv("SSLCTLFD",strnum,1);
if (fcntl(pi[0],F_SETFD,0) == -1)
strerr_die2sys(111,FATAL,"unable to clear close-on-exec flag");
strnum[fmt_ulong(strnum,pi[0])]=0;
setenv("SSLREADFD",strnum,1);
if (fcntl(po[1],F_SETFD,0) == -1)
strerr_die2sys(111,FATAL,"unable to clear close-on-exec flag");
strnum[fmt_ulong(strnum,po[1])]=0;
setenv("SSLWRITEFD",strnum,1);
if (flagsslwait) {
if (fd_copy(0,t) == -1)
strerr_die2sys(111,DROP,"unable to set up descriptor 0: ");
if (fd_copy(1,t) == -1)
strerr_die2sys(111,DROP,"unable to set up descriptor 1: ");
} else {
if (fd_move(0,pi[0]) == -1)
strerr_die2sys(111,DROP,"unable to set up descriptor 0: ");
if (fd_move(1,po[1]) == -1)
strerr_die2sys(111,DROP,"unable to set up descriptor 1: ");
}
if (flagkillopts)
socket_ipoptionskill(t);
if (!flagdelay)
socket_tcpnodelay(t);
if (*banner) {
buffer_init(&b,buffer_unixwrite,1,bspace,sizeof bspace);
if (buffer_putsflush(&b,banner) == -1)
strerr_die2sys(111,DROP,"unable to print banner: ");
}
if (!flagsslwait) {
strnum[fmt_ulong(strnum,flagsslenv)] = 0;
strerr_warn2("flagsslenv: ", strnum, 0);
ucspitls(flagsslenv,0,1);
}
pathexec(prog);
strerr_die4sys(111,DROP,"unable to run ",*prog,": ");
}
void doit(int t) {
int j;
SSL *ssl;
int wstat;
int sslctl[2];
char *s;
unsigned long tmp_long;
char ssl_cmd;
stralloc ssl_env = { 0 };
int bytesleft;
char envbuf[8192];
int childpid;
if (pipe(pi) == -1) strerr_die2sys(111,DROP,"unable to create pipe: ");
if (pipe(po) == -1) strerr_die2sys(111,DROP,"unable to create pipe: ");
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sslctl) == -1) strerr_die2sys(111,DROP,"unable to create socketpair: ");
if ((j = ip_fmt(&remoteipsa,&remoteaddr)))
strerr_die3x(111,DROP,"unable to print remote ip",gai_strerror(j));
if (flagremotehost) {
if (dns_name(&remotehostsa,&remoteaddr) == 0)
if (remotehostsa.len) {
if (flagparanoid) {
struct addrinfo *reverse, hints = {0};
verifyhost = remoteipsa.s;
hints.ai_family = remoteaddr.sa4.sin_family;
if (remoteaddr.sa6.sin6_family == AF_INET6) {
hints.ai_flags = AI_V4MAPPED | AI_ALL;
}
if (getaddrinfo(remotehostsa.s, NULL, &hints, &reverse) == 0) {
hints.ai_next = reverse;
while (hints.ai_next) {
if (hints.ai_next->ai_family == AF_INET
&& remoteaddr.sa4.sin_family == AF_INET
&& byte_equal(&remoteaddr.sa4.sin_addr, 4, &((struct sockaddr_in*) hints.ai_next->ai_addr)->sin_addr)
|| hints.ai_next->ai_family == AF_INET6
&& remoteaddr.sa6.sin6_family == AF_INET6
&& byte_equal(remoteaddr.sa6.sin6_addr.s6_addr, 16,
&((struct sockaddr_in6*) hints.ai_next->ai_addr)->sin6_addr.s6_addr)) {
flagparanoid = 0;
break;
}
hints.ai_next = hints.ai_next->ai_next;
}
freeaddrinfo(reverse);
}
}
if (!flagparanoid) {
remotehost = remotehostsa.s;
verifyhost = remotehostsa.s;
}
}
}
switch(childpid=fork()) {
case -1:
strerr_die2sys(111,DROP,"unable to fork: ");
case 0:
/* Child */
close(sslctl[0]);
break;
default:
/* Parent */
close(pi[0]); close(po[1]); close(sslctl[1]);
if ((s=env_get("SSL_CHROOT")))
if (chroot(s) == -1) {
kill(childpid, SIGTERM);
strerr_die2x(111,DROP,"unable to chroot");
}
if ((s=env_get("SSL_GID"))) {
scan_ulong(s,&tmp_long);
gid = tmp_long;
}
if (gid) if (prot_gid(gid) == -1) {
kill(childpid, SIGTERM);
strerr_die2sys(111,FATAL,"unable to set gid: ");
}
if ((s=env_get("SSL_UID"))) {
scan_ulong(s,&tmp_long);
uid = tmp_long;
}
if (uid)
if (prot_uid(uid) == -1) {
kill(childpid, SIGTERM);
strerr_die2sys(111,FATAL,"unable to set uid: ");
}
/* Read the TLS command socket. This will block until/unless
* TLS is requested.
*/
if (read(sslctl[0],&ssl_cmd,1) == 1) {
ssl = ssl_new(ctx,t);
if (!ssl) {
kill(childpid, SIGTERM);
strerr_die2x(111,DROP,"unable to create SSL instance");
}
if (ndelay_on(t) == -1) {
kill(childpid, SIGTERM);
strerr_die2sys(111,DROP,"unable to set socket options: ");
}
if (ssl_timeoutaccept(ssl,ssltimeout) == -1) {
kill(childpid, SIGTERM);
strerr_die3x(111,DROP,"unable to accept SSL: ",ssl_error_str(ssl_errno));
}
}
if (verbosity >= 2) {
strnum[fmt_ulong(strnum,getpid())] = 0;
strerr_warn3("sslserver: ssl ",strnum," accept ",0);
}
if (flagclientcert) {
switch(ssl_verify(ssl,verifyhost)) {
case -1:
kill(childpid, SIGTERM);
strerr_die2x(111,DROP,"unable to verify client certificate");
case -2:
kill(childpid, SIGTERM);
strerr_die2x(111,DROP,"no client certificate");
case -3:
kill(childpid, SIGTERM);
strerr_die3x(111,DROP,"certificate name does not match client fqdn: ",verifyhost);
default: break;
}
}
if (ssl_cmd == 'Y') {
ssl_server_env(ssl, &ssl_env);
if(!stralloc_0(&ssl_env)) drop_nomem(); /* Add another NUL */
env("SSLCTL",ssl_env.s);
for(bytesleft = ssl_env.len; bytesleft>0; bytesleft-=j)
if ( (j=write(sslctl[0], ssl_env.s, bytesleft)) < 0) {
kill(childpid, SIGTERM);
strerr_die2sys(111, FATAL, "unable to write SSL environment: ");
}
}
if (ssl_cmd == 'Y' || ssl_cmd == 'y') {
if (ssl_io(ssl,pi[1],po[0],progtimeout) != 0) {
kill(childpid, SIGTERM);
strerr_die3x(111,DROP,"unable to speak SSL: ",ssl_error_str(ssl_errno));
}
if (wait_nohang(&wstat) > 0)
_exit(wait_exitcode(wstat));
ssl_close(ssl);
}
kill(childpid, SIGTERM);
_exit(0);
}
/* Child-only below this point */
if (verbosity >= 2) {
strnum[fmt_ulong(strnum,getpid())] = 0;
strerr_warn4("sslserver: pid ",strnum," from ",remoteipsa.s,0);
}
if (socket_local(t,&localaddr,&localport) == -1)
strerr_die2sys(111,DROP,"unable to get local address: ");
if ((j = ip_fmt(&localipsa,&localaddr)))
strerr_die3x(111,DROP,"unable to print local address: ",gai_strerror(j));
remoteportstr[fmt_ulong(remoteportstr,remoteport)] = 0;
if (!localhost)
if (dns_name(&localhostsa,&localaddr) == 0)
if (localhostsa.len) {
if (!stralloc_0(&localhostsa)) drop_nomem();
localhost = localhostsa.s;
}
/* If remoteipsa.s contain ':' colon character will assume it is IPv6 */
if (byte_chr(remoteipsa.s, remoteipsa.len, ':') < remoteipsa.len)
env("PROTO","SSL6");
else
env("PROTO","SSL");
env("SSLLOCALIP",localipsa.s);
env("SSLLOCALPORT",localportstr);
env("SSLLOCALHOST",localhost);
if (flagtcpenv) {
env("TCPLOCALIP",localipsa.s);
env("TCPLOCALPORT",localportstr);
env("TCPLOCALHOST",localhost);
}
env("SSLREMOTEIP",remoteipsa.s);
env("SSLREMOTEPORT",remoteportstr);
env("SSLREMOTEHOST",remotehost);
if (flagtcpenv) {
env("TCPREMOTEIP",remoteipsa.s);
env("TCPREMOTEPORT",remoteportstr);
env("TCPREMOTEHOST",remotehost);
}
if (flagremoteinfo) {
if (remoteinfo(&tcpremoteinfo,&remoteaddr,&localaddr,timeout) == -1)
flagremoteinfo = 0;
if (!stralloc_0(&tcpremoteinfo)) drop_nomem();
}
env("SSLREMOTEINFO",flagremoteinfo ? tcpremoteinfo.s : 0);
if (flagtcpenv)
env("TCPREMOTEINFO",flagremoteinfo ? tcpremoteinfo.s : 0);
if (fnrules) {
int fdrules;
fdrules = open_read(fnrules);
if (fdrules == -1) {
if (errno != error_noent) drop_rules();
if (!flagallownorules) drop_rules();
}
else {
if (rules(found,fdrules,&remoteaddr,remotehost,flagremoteinfo ? tcpremoteinfo.s : 0) == -1)
drop_rules();
close(fdrules);
}
}
if (verbosity >= 2) {
strnum[fmt_ulong(strnum,getpid())] = 0;
if (!stralloc_copys(&tmp,"sslserver: ")) drop_nomem();
safecats(flagdeny ? "deny" : "ok");
cats(" "); safecats(strnum);
cats(" "); if (localhost) safecats(localhost);
cats(":"); safecats(localipsa.s);
cats(":"); safecats(localportstr);
cats(" "); if (remotehost) safecats(remotehost);
cats(":"); safecats(remoteipsa.s);
cats(":"); if (flagremoteinfo) safecats(tcpremoteinfo.s);
cats(":"); safecats(remoteportstr);
cats("\n");
buffer_putflush(buffer_2,tmp.s,tmp.len);
}
if (flagdeny) _exit(100);
if (gid) if (prot_gid(gid) == -1)
strerr_die2sys(111,FATAL,"unable to set gid: ");
if (uid) if (prot_uid(uid) == -1)
strerr_die2sys(111,FATAL,"unable to set uid: ");
close(pi[1]); close(po[0]); close(sslctl[0]);
sig_uncatch(sig_child);
sig_unblock(sig_child);
sig_uncatch(sig_term);
sig_uncatch(sig_pipe);
if (fcntl(sslctl[1],F_SETFD,0) == -1)
strerr_die2sys(111,FATAL,"unable to clear close-on-exec flag");
strnum[fmt_ulong(strnum,sslctl[1])]=0;
env("SSLCTLFD",strnum);
if (fcntl(pi[0],F_SETFD,0) == -1)
strerr_die2sys(111,FATAL,"unable to clear close-on-exec flag");
strnum[fmt_ulong(strnum,pi[0])]=0;
env("SSLREADFD",strnum);
if (fcntl(po[1],F_SETFD,0) == -1)
strerr_die2sys(111,FATAL,"unable to clear close-on-exec flag");
strnum[fmt_ulong(strnum,po[1])]=0;
env("SSLWRITEFD",strnum);
if (flagsslwait) {
if (fd_copy(0,t) == -1)
strerr_die2sys(111,DROP,"unable to set up descriptor 0: ");
if (fd_copy(1,t) == -1)
strerr_die2sys(111,DROP,"unable to set up descriptor 1: ");
} else {
if (fd_move(0,pi[0]) == -1)
strerr_die2sys(111,DROP,"unable to set up descriptor 0: ");
if (fd_move(1,po[1]) == -1)
strerr_die2sys(111,DROP,"unable to set up descriptor 1: ");
}
if (flagkillopts)
socket_ipoptionskill(t);
if (!flagdelay)
socket_tcpnodelay(t);
if (*banner) {
buffer_init(&b,buffer_unixwrite,1,bspace,sizeof bspace);
if (buffer_putsflush(&b,banner) == -1)
strerr_die2sys(111,DROP,"unable to print banner: ");
}
if (!flagsslwait) {
ssl_cmd = flagsslenv ? 'Y' : 'y';
if (write(sslctl[1], &ssl_cmd, 1) < 1)
strerr_die2sys(111,DROP,"unable to start SSL: ");
if (flagsslenv) {
while ((j=read(sslctl[1],envbuf,8192)) > 0) {
stralloc_catb(&ssl_env,envbuf,j);
if (ssl_env.len >= 2 && ssl_env.s[ssl_env.len-2]==0 && ssl_env.s[ssl_env.len-1]==0)
break;
}
if (j < 0)
strerr_die2sys(111,DROP,"unable to read SSL environment: ");
pathexec_multienv(&ssl_env);
}
}
pathexec(prog);
strerr_die4sys(111,DROP,"unable to run ",*prog,": ");
}
main(int argc,char **argv)
{
int fakev4=0;
unsigned long u;
int opt;
char *x;
int j;
int s;
int cloop;
dns_random_init(seed);
close(6);
close(7);
sig_ignore(sig_pipe);
while ((opt = getopt(argc,argv,"46dDvqQhHrRi:p:t:T:l:I:")) != opteof)
switch(opt) {
case '4': noipv6 = 1; break;
case '6': forcev6 = 1; break;
case 'd': flagdelay = 1; break;
case 'D': flagdelay = 0; break;
case 'v': verbosity = 2; break;
case 'q': verbosity = 0; break;
case 'Q': verbosity = 1; break;
case 'l': forcelocal = optarg; break;
case 'H': flagremotehost = 0; break;
case 'h': flagremotehost = 1; break;
case 'R': flagremoteinfo = 0; break;
case 'r': flagremoteinfo = 1; break;
case 't': scan_ulong(optarg,&itimeout); break;
case 'T': j = scan_ulong(optarg,&ctimeout[0]);
if (optarg[j] == '+') ++j;
scan_ulong(optarg + j,&ctimeout[1]);
break;
case 'i': if (!scan_ip6(optarg,iplocal)) usage(); break;
case 'I': netif=socket_getifidx(optarg); break;
case 'p': scan_ulong(optarg,&u); portlocal = u; break;
default: usage();
}
argv += optind;
if (!verbosity)
buffer_2->fd = -1;
hostname = *argv;
if (!hostname) usage();
if (!hostname[0] || str_equal(hostname,"0"))
hostname = (noipv6?"127.0.0.1":"::1");
x = *++argv;
if (!x) usage();
if (!x[scan_ulong(x,&u)])
portremote = u;
else {
struct servent *se;
se = getservbyname(x,"tcp");
if (!se)
strerr_die3x(111,FATAL,"unable to figure out port number for ",x);
portremote = ntohs(se->s_port);
/* i continue to be amazed at the stupidity of the s_port interface */
}
if (!*++argv) usage();
if (!stralloc_copys(&tmp,hostname)) nomem();
if (dns_ip6_qualify(&addresses,&fqdn,&tmp) == -1)
strerr_die4sys(111,FATAL,"temporarily unable to figure out IP address for ",hostname,": ");
if (addresses.len < 16)
strerr_die3x(111,FATAL,"no IP address for ",hostname);
if (addresses.len == 16) {
ctimeout[0] += ctimeout[1];
ctimeout[1] = 0;
}
for (cloop = 0;cloop < 2;++cloop) {
if (!stralloc_copys(&moreaddresses,"")) nomem();
for (j = 0;j + 16 <= addresses.len;j += 4) {
s = socket_tcp6();
if (s == -1)
strerr_die2sys(111,FATAL,"unable to create socket: ");
if (socket_bind6(s,iplocal,portlocal,netif) == -1)
strerr_die2sys(111,FATAL,"unable to bind socket: ");
if (timeoutconn6(s,addresses.s + j,portremote,ctimeout[cloop],netif) == 0)
goto CONNECTED;
close(s);
if (!cloop && ctimeout[1] && (errno == error_timeout)) {
if (!stralloc_catb(&moreaddresses,addresses.s + j,16)) nomem();
}
else {
strnum[fmt_ulong(strnum,portremote)] = 0;
if (ip6_isv4mapped(addresses.s+j))
ipstr[ip4_fmt(ipstr,addresses.s + j + 12)] = 0;
else
ipstr[ip6_fmt(ipstr,addresses.s + j)] = 0;
strerr_warn5(CONNECT,ipstr," port ",strnum,": ",&strerr_sys);
}
}
if (!stralloc_copy(&addresses,&moreaddresses)) nomem();
}
_exit(111);
CONNECTED:
if (!flagdelay)
socket_tcpnodelay(s); /* if it fails, bummer */
if (socket_local6(s,iplocal,&portlocal,&netif) == -1)
strerr_die2sys(111,FATAL,"unable to get local address: ");
if (!forcev6 && (ip6_isv4mapped(iplocal) || byte_equal(iplocal,16,V6any)))
fakev4=1;
if (!pathexec_env("PROTO",fakev4?"TCP":"TCP6")) nomem();
strnum[fmt_ulong(strnum,portlocal)] = 0;
if (!pathexec_env("TCPLOCALPORT",strnum)) nomem();
if (fakev4)
ipstr[ip4_fmt(ipstr,iplocal+12)] = 0;
else
ipstr[ip6_fmt(ipstr,iplocal)] = 0;
if (!pathexec_env("TCPLOCALIP",ipstr)) nomem();
x = forcelocal;
if (!x)
if (dns_name6(&tmp,iplocal) == 0) {
if (!stralloc_0(&tmp)) nomem();
x = tmp.s;
}
if (!pathexec_env("TCPLOCALHOST",x)) nomem();
if (socket_remote6(s,ipremote,&portremote,&netif) == -1)
strerr_die2sys(111,FATAL,"unable to get remote address: ");
strnum[fmt_ulong(strnum,portremote)] = 0;
if (!pathexec_env("TCPREMOTEPORT",strnum)) nomem();
if (fakev4)
ipstr[ip4_fmt(ipstr,ipremote+12)] = 0;
else
ipstr[ip6_fmt(ipstr,ipremote)] = 0;
if (!pathexec_env("TCPREMOTEIP",ipstr)) nomem();
if (verbosity >= 2)
strerr_warn4("tcpclient: connected to ",ipstr," port ",strnum,0);
x = 0;
if (flagremotehost)
if (dns_name6(&tmp,ipremote) == 0) {
if (!stralloc_0(&tmp)) nomem();
x = tmp.s;
}
if (!pathexec_env("TCPREMOTEHOST",x)) nomem();
x = 0;
if (flagremoteinfo)
if (remoteinfo6(&tmp,ipremote,portremote,iplocal,portlocal,itimeout,netif) == 0) {
if (!stralloc_0(&tmp)) nomem();
x = tmp.s;
}
if (!pathexec_env("TCPREMOTEINFO",x)) nomem();
if (fd_move(6,s) == -1)
strerr_die2sys(111,FATAL,"unable to set up descriptor 6: ");
if (fd_copy(7,6) == -1)
strerr_die2sys(111,FATAL,"unable to set up descriptor 7: ");
sig_uncatch(sig_pipe);
pathexec(argv);
strerr_die4sys(111,FATAL,"unable to run ",*argv,": ");
}
int main(int argc,char **argv)
{
char *hostname, *x;
int c, s, t;
unsigned int u;
unsigned int cpid = 0;
opterr = 0;
while ((c = getopt(argc, argv, "dDoOC:k:c:")) != -1)
switch (c) {
case 'c':
limit = atoi(optarg);
if (limit == 0) usage();
break;
case 'd': flagdelay = 1; break;
case 'D': flagdelay = 0; break;
case 'O': flagkillopts = 1; break;
case 'o': flagkillopts = 0; break;
case 'C': cacheprogram = 1; break;
case 'k':
autokill = atoi(optarg);
if (autokill == 0) usage();
break;
default: abort();
}
argc -= optind;
argv += optind;
hostname = *argv++;
if (!hostname) usage();
x = *argv++;
if (!x) usage();
u = 0;
u = atoi(x);
if (u != 0) localport = u;
else usage();
if (!*argv) usage();
sig_block(sig_child);
sig_catch(sig_child,sigchld);
sig_catch(sig_term,sigterm);
sig_catch(sig_int,sigint);
sig_ignore(sig_pipe);
inet_aton(hostname, (struct in_addr *) &localip);
if (autokill != 0) pt = ptable_init(limit);
s = socket_tcp();
if (s == -1) die(111, "unable to create socket");
if (socket_bind4_reuse(s,localip,localport) == -1) die(111, "unable to bind");
if (socket_local4(s,localip,&localport) == -1) die(111, "unable to get local address");
if (socket_listen(s,20) == -1) die(111, "unable to listen");
ndelay_off(s);
fprintf(stderr, "bind: %s:%d\n", hostname, localport);
close(0);
close(1);
printstatus();
if (cacheprogram) {
FILE *fp1;
int fp2;
char path[1024];
ssize_t n;
fp1 = popen(*argv, "r");
if (fp1 == NULL) {
fprintf(stderr, "Failed to run command\n");
exit(1);
}
fp2 = open("/var/tmp/tcpd.cache", O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
if (fp2 == -1) {
fprintf(stderr, "Can't open cache file\n");
exit(1);
}
while ((n = fgets(path, sizeof(path)-1, fp1)) != NULL) {
if (write(fp2, path, n) == n) {
fprintf(stderr, "Error occured while creating cache\n");
exit(1);
}
}
/* close */
pclose(fp1);
close(fp2);
// read cache file into memory
FILE *f = fopen("/var/tmp/tcpd.cache", "rb");
fseek(f, 0, SEEK_END);
cachesize = ftell(f);
fseek(f, 0, SEEK_SET); //same as rewind(f);
cache = malloc(cachesize + 1);
n = fread(cache, cachesize, 1, f);
fclose(f);
cache[cachesize] = 0;
}
for (;;) {
while (numchildren >= limit) {
if (autokill != 0) ptable_autokill(pt, limit, autokill);
sig_pause();
}
sig_unblock(sig_child);
t = socket_accept4(s,remoteip,&remoteport);
sig_block(sig_child);
if (t == -1) continue;
++numchildren; printstatus();
fprintf(stderr, "inbound connection from %d.%d.%d.%d:%d\n", (unsigned char) remoteip[0], (unsigned char) remoteip[1], (unsigned char) remoteip[2], (unsigned char) remoteip[3], remoteport);
if (autokill != 0) ptable_autokill(pt,limit,autokill);
cpid = fork();
switch(cpid) {
case 0:
close(s);
if(flagkillopts) socket_ipoptionskill(t);
if(!flagdelay) socket_tcpnodelay(t);
if((fd_move(0,t) == -1) || (fd_copy(1,0) == -1)) die(111,"unable to setup descriptors");
sig_uncatch(sig_child);
sig_unblock(sig_child);
sig_uncatch(sig_term);
sig_uncatch(sig_int);
sig_uncatch(sig_pipe);
if (cacheprogram) {
printf("%s", cache);
close(t);
exit(0);
} else {
if(execve(*argv,argv,NULL) == 0) {
close(t);
exit(0);
} else {
die(111, "unable to run argv");
}
}
break;
case -1:
// unable to fork
eprint(P_WARN,"unable to fork");
--numchildren; printstatus();
break;
default:
fprintf(stderr, "fork: child pid %d\n", cpid);
if (autokill != 0) ptable_set(pt, limit, cpid, time(NULL));
break;
}
close(t);
}
}
void connection_accept(int c) {
int ac;
const char **run;
const char *args[4];
char *ip =(char*)&socka.sin_addr;
remote_ip[ipsvd_fmt_ip(remote_ip, ip)] =0;
if (verbose) {
out(INFO); out("pid ");
bufnum[fmt_ulong(bufnum, getpid())] =0;
out(bufnum); out(" from "); outfix(remote_ip); flush("\n");
}
remote_port[ipsvd_fmt_port(remote_port, (char*)&socka.sin_port)] =0;
if (lookuphost) {
if (ipsvd_hostname(&remote_hostname, ip, paranoid) == -1)
warn2("unable to look up hostname", remote_ip);
if (! stralloc_0(&remote_hostname)) drop_nomem();
}
socka_size =sizeof(socka);
if (getsockname(c, (struct sockaddr*)&socka, &socka_size) == -1)
drop("unable to get local address");
if (! local_hostname.len) {
if (dns_name4(&local_hostname, (char*)&socka.sin_addr) == -1)
drop("unable to look up local hostname");
if (! stralloc_0(&local_hostname)) die_nomem();
}
local_ip[ipsvd_fmt_ip(local_ip, (char*)&socka.sin_addr)] =0;
if (ucspi) ucspi_env();
if (instructs) {
ac =ipsvd_check(iscdb, &inst, &match, (char*)instructs,
remote_ip, remote_hostname.s, timeout);
if (ac == -1) drop2("unable to check inst", remote_ip);
if (ac == IPSVD_ERR) drop2("unable to read", (char*)instructs);
}
else ac =IPSVD_DEFAULT;
if (phccmax) {
if (phcc > phccmax) {
ac =IPSVD_DENY;
if (phccmsg) {
ndelay_on(c);
if (write(c, phccmsg, str_len(phccmsg)) == -1)
warn("unable to write concurrency message");
}
}
if (verbose) {
bufnum[fmt_ulong(bufnum, getpid())] =0;
out(INFO); out("concurrency "); out(bufnum); out(" ");
outfix(remote_ip); out(" ");
bufnum[fmt_ulong(bufnum, phcc)] =0;
out(bufnum); out("/");
bufnum[fmt_ulong(bufnum, phccmax)] =0;
out(bufnum); out("\n");
}
}
if (verbose) {
out(INFO);
switch(ac) {
case IPSVD_DENY: out("deny "); break;
case IPSVD_DEFAULT: case IPSVD_INSTRUCT: out("start "); break;
case IPSVD_EXEC: out("exec "); break;
}
bufnum[fmt_ulong(bufnum, getpid())] =0;
out(bufnum); out(" ");
outfix(local_hostname.s); out(":"); out(local_ip);
out(" :"); outfix(remote_hostname.s); out(":");
outfix(remote_ip); out(":"); outfix(remote_port);
if (instructs) {
out(" ");
if (iscdb) {
out((char*)instructs); out("/");
}
outfix(match.s);
if(inst.s && inst.len && (verbose > 1)) {
out(": "); outinst(&inst);
}
}
flush("\n");
}
if (ac == IPSVD_DENY) {
close(c);
_exit(100);
}
if (ac == IPSVD_EXEC) {
args[0] ="/bin/sh"; args[1] ="-c"; args[2] =inst.s; args[3] =0;
run =args;
}
else run =prog;
if ((fd_move(0, c) == -1) || (fd_copy(1, 0) == -1))
drop("unable to set filedescriptor");
sig_uncatch(sig_term);
sig_uncatch(sig_pipe);
sig_uncatch(sig_child);
sig_unblock(sig_child);
#ifdef SSLSVD
pid =getpid();
id[fmt_ulong(id, pid)] =0;
ssl_io(0, run);
#else
pathexec(run);
#endif
drop2("unable to run", (char *)*prog);
}
int main(int argc,char **argv)
{
char *hostname;
// char *portname;
int opt;
struct servent *se;
char *x;
unsigned long u;
int s;
int t;
while ((opt = getopt(argc,argv,"4dDvqQhHrR1UXx:t:u:g:l:b:B:c:I:pPoO")) != opteof)
switch(opt) {
case 'b': scan_ulong(optarg,&backlog); break;
case 'c': scan_ulong(optarg,&limit); break;
case 'X': flagallownorules = 1; break;
case 'x': fnrules = optarg; break;
case 'B': banner = optarg; break;
case 'd': flagdelay = 1; break;
case 'D': flagdelay = 0; break;
case 'v': verbosity = 2; break;
case 'q': verbosity = 0; break;
case 'Q': verbosity = 1; break;
case 'P': flagparanoid = 0; break;
case 'p': flagparanoid = 1; break;
case 'O': flagkillopts = 1; break;
case 'o': flagkillopts = 0; break;
case 'H': flagremotehost = 0; break;
case 'h': flagremotehost = 1; break;
// case 'R': flagremoteinfo = 0; break;
case 'r': flagremoteinfo = 1; break;
case 't': scan_ulong(optarg,&timeout); break;
case 'U': x = env_get("UID"); if (x) scan_ulong(x,&uid);
x = env_get("GID"); if (x) scan_ulong(x,&gid); break;
case 'u': scan_ulong(optarg,&uid); break;
case 'g': scan_ulong(optarg,&gid); break;
case 'I': netif=socket_getifidx(optarg); break;
case '1': flag1 = 1; break;
// case '4': noipv6 = 1; break;
case '4': ipv4socket = 1; break;
// case '6': forcev6 = 1; break;
case 'l': localhost = optarg; break;
default: usage();
}
argc -= optind;
argv += optind;
if (!verbosity)
buffer_2->fd = -1;
hostname = *argv++;
if (!hostname) usage();
if (str_equal(hostname,"")) hostname = "0";
x = *argv++;
if (!x) usage();
if (!x[scan_ulong(x,&u)])
localport = u;
else {
se = getservbyname(x,"tcp");
if (!se)
errint(EHARD,B("unable to figure out port number for ",x));
uint16_unpack_big((char*)&se->s_port,&localport);
}
if (!*argv) usage();
sig_block(sig_child);
sig_catch(sig_child,sigchld);
sig_catch(sig_term,sigterm);
sig_ignore(sig_pipe);
if (str_equal(hostname,"0")) {
byte_zero(localip,sizeof localip);
} else {
if (!stralloc_copys(&tmp,hostname)) errmem;
if (dns_ip6_qualify(&addresses,&fqdn,&tmp) == -1)
errint(EHARD,B("temporarily unable to figure out IP address for ",hostname,": "));
if (addresses.len < 16)
errint(EHARD,B("no IP address for ",hostname));
byte_copy(localip,16,addresses.s);
if (ip6_isv4mapped(localip))
ipv4socket = 1;
}
s = socket_tcp();
if (s == -1)
errint(EHARD,"unable to create socket: ");
if (socket_bind_reuse(s,localip,localport,netif) == -1)
errint(EHARD,"unable to bind: ");
if (!ipv4socket) ipv4socket = ip6_isv4mapped(localip);
if (socket_local(s,localip,&localport,&netif) == -1)
errint(EHARD,"unable to get local address: ");
if (socket_listen(s,backlog) == -1)
errint(EHARD,"unable to listen: ");
ndelay_off(s);
if (gid) if (prot_gid(gid) == -1)
errint(EHARD,"unable to set gid: ");
if (uid) if (prot_uid(uid) == -1)
errint(EHARD,"unable to set uid: ");
localportstr[fmt_ulong(localportstr,localport)] = 0;
if (flag1) {
buffer_init(&b,write,1,bspace,sizeof bspace);
buffer_puts(&b,localportstr);
buffer_puts(&b,"\n");
buffer_flush(&b);
}
close(0);
close(1);
printstatus();
for (;;) {
while (numchildren >= limit) sig_pause();
sig_unblock(sig_child);
t = socket_accept(s,remoteip,&remoteport,&netif);
sig_block(sig_child);
if (t == -1) continue;
++numchildren; printstatus();
switch(fork()) {
case 0:
close(s);
doit(t);
if ((fd_move(0,t) == -1) || (fd_copy(1,0) == -1))
errint(EHARD,"unable to set up descriptors: ");
sig_uncatch(sig_child);
sig_unblock(sig_child);
sig_uncatch(sig_term);
sig_uncatch(sig_pipe);
pathexec(argv);
errint(EHARD,B("unable to run ",*argv,": "));
case -1:
errlog(ESOFT,NOTICE,"unable to fork: ");
--numchildren; printstatus();
}
close(t);
}
}
/*
* General fork call. Note that another LWP in the process may call exec()
* or exit() while we are forking. It's safe to continue here, because
* neither operation will complete until all LWPs have exited the process.
*/
int
fork1(struct lwp *l1, int flags, int exitsig, void *stack, size_t stacksize,
void (*func)(void *), void *arg, register_t *retval,
struct proc **rnewprocp)
{
struct proc *p1, *p2, *parent;
struct plimit *p1_lim;
uid_t uid;
struct lwp *l2;
int count;
vaddr_t uaddr;
int tnprocs;
int tracefork;
int error = 0;
p1 = l1->l_proc;
uid = kauth_cred_getuid(l1->l_cred);
tnprocs = atomic_inc_uint_nv(&nprocs);
/*
* Although process entries are dynamically created, we still keep
* a global limit on the maximum number we will create.
*/
if (__predict_false(tnprocs >= maxproc))
error = -1;
else
error = kauth_authorize_process(l1->l_cred,
KAUTH_PROCESS_FORK, p1, KAUTH_ARG(tnprocs), NULL, NULL);
if (error) {
static struct timeval lasttfm;
atomic_dec_uint(&nprocs);
if (ratecheck(&lasttfm, &fork_tfmrate))
tablefull("proc", "increase kern.maxproc or NPROC");
if (forkfsleep)
kpause("forkmx", false, forkfsleep, NULL);
return EAGAIN;
}
/*
* Enforce limits.
*/
count = chgproccnt(uid, 1);
if (__predict_false(count > p1->p_rlimit[RLIMIT_NPROC].rlim_cur)) {
if (kauth_authorize_process(l1->l_cred, KAUTH_PROCESS_RLIMIT,
p1, KAUTH_ARG(KAUTH_REQ_PROCESS_RLIMIT_BYPASS),
&p1->p_rlimit[RLIMIT_NPROC], KAUTH_ARG(RLIMIT_NPROC)) != 0) {
(void)chgproccnt(uid, -1);
atomic_dec_uint(&nprocs);
if (forkfsleep)
kpause("forkulim", false, forkfsleep, NULL);
return EAGAIN;
}
}
/*
* Allocate virtual address space for the U-area now, while it
* is still easy to abort the fork operation if we're out of
* kernel virtual address space.
*/
uaddr = uvm_uarea_alloc();
if (__predict_false(uaddr == 0)) {
(void)chgproccnt(uid, -1);
atomic_dec_uint(&nprocs);
return ENOMEM;
}
/*
* We are now committed to the fork. From here on, we may
* block on resources, but resource allocation may NOT fail.
*/
/* Allocate new proc. */
p2 = proc_alloc();
/*
* Make a proc table entry for the new process.
* Start by zeroing the section of proc that is zero-initialized,
* then copy the section that is copied directly from the parent.
*/
memset(&p2->p_startzero, 0,
(unsigned) ((char *)&p2->p_endzero - (char *)&p2->p_startzero));
memcpy(&p2->p_startcopy, &p1->p_startcopy,
(unsigned) ((char *)&p2->p_endcopy - (char *)&p2->p_startcopy));
TAILQ_INIT(&p2->p_sigpend.sp_info);
LIST_INIT(&p2->p_lwps);
LIST_INIT(&p2->p_sigwaiters);
/*
* Duplicate sub-structures as needed.
* Increase reference counts on shared objects.
* Inherit flags we want to keep. The flags related to SIGCHLD
* handling are important in order to keep a consistent behaviour
* for the child after the fork. If we are a 32-bit process, the
* child will be too.
*/
p2->p_flag =
p1->p_flag & (PK_SUGID | PK_NOCLDWAIT | PK_CLDSIGIGN | PK_32);
p2->p_emul = p1->p_emul;
p2->p_execsw = p1->p_execsw;
if (flags & FORK_SYSTEM) {
/*
* Mark it as a system process. Set P_NOCLDWAIT so that
* children are reparented to init(8) when they exit.
* init(8) can easily wait them out for us.
*/
p2->p_flag |= (PK_SYSTEM | PK_NOCLDWAIT);
}
mutex_init(&p2->p_stmutex, MUTEX_DEFAULT, IPL_HIGH);
mutex_init(&p2->p_auxlock, MUTEX_DEFAULT, IPL_NONE);
rw_init(&p2->p_reflock);
cv_init(&p2->p_waitcv, "wait");
cv_init(&p2->p_lwpcv, "lwpwait");
/*
* Share a lock between the processes if they are to share signal
* state: we must synchronize access to it.
*/
if (flags & FORK_SHARESIGS) {
p2->p_lock = p1->p_lock;
mutex_obj_hold(p1->p_lock);
} else
p2->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
kauth_proc_fork(p1, p2);
p2->p_raslist = NULL;
#if defined(__HAVE_RAS)
ras_fork(p1, p2);
#endif
/* bump references to the text vnode (for procfs) */
p2->p_textvp = p1->p_textvp;
if (p2->p_textvp)
vref(p2->p_textvp);
if (flags & FORK_SHAREFILES)
fd_share(p2);
else if (flags & FORK_CLEANFILES)
p2->p_fd = fd_init(NULL);
else
p2->p_fd = fd_copy();
/* XXX racy */
p2->p_mqueue_cnt = p1->p_mqueue_cnt;
if (flags & FORK_SHARECWD)
cwdshare(p2);
else
p2->p_cwdi = cwdinit();
/*
* Note: p_limit (rlimit stuff) is copy-on-write, so normally
* we just need increase pl_refcnt.
*/
p1_lim = p1->p_limit;
if (!p1_lim->pl_writeable) {
lim_addref(p1_lim);
p2->p_limit = p1_lim;
} else {
p2->p_limit = lim_copy(p1_lim);
}
if (flags & FORK_PPWAIT) {
/* Mark ourselves as waiting for a child. */
l1->l_pflag |= LP_VFORKWAIT;
p2->p_lflag = PL_PPWAIT;
p2->p_vforklwp = l1;
} else {
p2->p_lflag = 0;
}
p2->p_sflag = 0;
p2->p_slflag = 0;
parent = (flags & FORK_NOWAIT) ? initproc : p1;
p2->p_pptr = parent;
p2->p_ppid = parent->p_pid;
LIST_INIT(&p2->p_children);
p2->p_aio = NULL;
#ifdef KTRACE
/*
* Copy traceflag and tracefile if enabled.
* If not inherited, these were zeroed above.
*/
if (p1->p_traceflag & KTRFAC_INHERIT) {
mutex_enter(&ktrace_lock);
p2->p_traceflag = p1->p_traceflag;
if ((p2->p_tracep = p1->p_tracep) != NULL)
ktradref(p2);
mutex_exit(&ktrace_lock);
}
#endif
/*
* Create signal actions for the child process.
*/
p2->p_sigacts = sigactsinit(p1, flags & FORK_SHARESIGS);
mutex_enter(p1->p_lock);
p2->p_sflag |=
(p1->p_sflag & (PS_STOPFORK | PS_STOPEXEC | PS_NOCLDSTOP));
sched_proc_fork(p1, p2);
mutex_exit(p1->p_lock);
p2->p_stflag = p1->p_stflag;
/*
* p_stats.
* Copy parts of p_stats, and zero out the rest.
*/
p2->p_stats = pstatscopy(p1->p_stats);
/*
* Set up the new process address space.
*/
uvm_proc_fork(p1, p2, (flags & FORK_SHAREVM) ? true : false);
/*
* Finish creating the child process.
* It will return through a different path later.
*/
lwp_create(l1, p2, uaddr, (flags & FORK_PPWAIT) ? LWP_VFORK : 0,
stack, stacksize, (func != NULL) ? func : child_return, arg, &l2,
l1->l_class);
/*
* Inherit l_private from the parent.
* Note that we cannot use lwp_setprivate() here since that
* also sets the CPU TLS register, which is incorrect if the
* process has changed that without letting the kernel know.
*/
l2->l_private = l1->l_private;
/*
* If emulation has a process fork hook, call it now.
*/
if (p2->p_emul->e_proc_fork)
(*p2->p_emul->e_proc_fork)(p2, l1, flags);
/*
* ...and finally, any other random fork hooks that subsystems
* might have registered.
*/
doforkhooks(p2, p1);
SDT_PROBE(proc,,,create, p2, p1, flags, 0, 0);
/*
* It's now safe for the scheduler and other processes to see the
* child process.
*/
mutex_enter(proc_lock);
if (p1->p_session->s_ttyvp != NULL && p1->p_lflag & PL_CONTROLT)
p2->p_lflag |= PL_CONTROLT;
LIST_INSERT_HEAD(&parent->p_children, p2, p_sibling);
p2->p_exitsig = exitsig; /* signal for parent on exit */
/*
* We don't want to tracefork vfork()ed processes because they
* will not receive the SIGTRAP until it is too late.
*/
tracefork = (p1->p_slflag & (PSL_TRACEFORK|PSL_TRACED)) ==
(PSL_TRACEFORK|PSL_TRACED) && (flags && FORK_PPWAIT) == 0;
if (tracefork) {
p2->p_slflag |= PSL_TRACED;
p2->p_opptr = p2->p_pptr;
if (p2->p_pptr != p1->p_pptr) {
struct proc *parent1 = p2->p_pptr;
if (parent1->p_lock < p2->p_lock) {
if (!mutex_tryenter(parent1->p_lock)) {
mutex_exit(p2->p_lock);
mutex_enter(parent1->p_lock);
}
} else if (parent1->p_lock > p2->p_lock) {
mutex_enter(parent1->p_lock);
}
parent1->p_slflag |= PSL_CHTRACED;
proc_reparent(p2, p1->p_pptr);
if (parent1->p_lock != p2->p_lock)
mutex_exit(parent1->p_lock);
}
/*
* Set ptrace status.
*/
p1->p_fpid = p2->p_pid;
p2->p_fpid = p1->p_pid;
}
LIST_INSERT_AFTER(p1, p2, p_pglist);
LIST_INSERT_HEAD(&allproc, p2, p_list);
p2->p_trace_enabled = trace_is_enabled(p2);
#ifdef __HAVE_SYSCALL_INTERN
(*p2->p_emul->e_syscall_intern)(p2);
#endif
/*
* Update stats now that we know the fork was successful.
*/
uvmexp.forks++;
if (flags & FORK_PPWAIT)
uvmexp.forks_ppwait++;
if (flags & FORK_SHAREVM)
uvmexp.forks_sharevm++;
/*
* Pass a pointer to the new process to the caller.
*/
if (rnewprocp != NULL)
*rnewprocp = p2;
if (ktrpoint(KTR_EMUL))
p2->p_traceflag |= KTRFAC_TRC_EMUL;
/*
* Notify any interested parties about the new process.
*/
if (!SLIST_EMPTY(&p1->p_klist)) {
mutex_exit(proc_lock);
KNOTE(&p1->p_klist, NOTE_FORK | p2->p_pid);
mutex_enter(proc_lock);
}
/*
* Make child runnable, set start time, and add to run queue except
* if the parent requested the child to start in SSTOP state.
*/
mutex_enter(p2->p_lock);
/*
* Start profiling.
*/
if ((p2->p_stflag & PST_PROFIL) != 0) {
mutex_spin_enter(&p2->p_stmutex);
startprofclock(p2);
mutex_spin_exit(&p2->p_stmutex);
}
getmicrotime(&p2->p_stats->p_start);
p2->p_acflag = AFORK;
lwp_lock(l2);
KASSERT(p2->p_nrlwps == 1);
if (p2->p_sflag & PS_STOPFORK) {
struct schedstate_percpu *spc = &l2->l_cpu->ci_schedstate;
p2->p_nrlwps = 0;
p2->p_stat = SSTOP;
p2->p_waited = 0;
p1->p_nstopchild++;
l2->l_stat = LSSTOP;
KASSERT(l2->l_wchan == NULL);
lwp_unlock_to(l2, spc->spc_lwplock);
} else {
p2->p_nrlwps = 1;
p2->p_stat = SACTIVE;
l2->l_stat = LSRUN;
sched_enqueue(l2, false);
lwp_unlock(l2);
}
/*
* Return child pid to parent process,
* marking us as parent via retval[1].
*/
if (retval != NULL) {
retval[0] = p2->p_pid;
retval[1] = 0;
}
mutex_exit(p2->p_lock);
/*
* Preserve synchronization semantics of vfork. If waiting for
* child to exec or exit, sleep until it clears LP_VFORKWAIT.
*/
#if 0
while (l1->l_pflag & LP_VFORKWAIT) {
cv_wait(&l1->l_waitcv, proc_lock);
}
#else
while (p2->p_lflag & PL_PPWAIT)
cv_wait(&p1->p_waitcv, proc_lock);
#endif
/*
* Let the parent know that we are tracing its child.
*/
if (tracefork) {
ksiginfo_t ksi;
KSI_INIT_EMPTY(&ksi);
ksi.ksi_signo = SIGTRAP;
ksi.ksi_lid = l1->l_lid;
kpsignal(p1, &ksi, NULL);
}
mutex_exit(proc_lock);
return 0;
}
