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next part of ipv6-ization. mostly netcat.

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This commit is contained in:
Denis Vlasenko 2007-01-12 20:59:31 +00:00
parent 2c91652bbc
commit 5d68724d5b
6 changed files with 94 additions and 76 deletions
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13
include/libbb.h
View File

@ -307,6 +307,9 @@ typedef struct len_and_sockaddr {
#endif
};
} len_and_sockaddr;
/* Create stream socket, and allocated suitable lsa
* (lsa of correct size and lsa->sa.sa_family (AF_INET/AF_INET6)) */
int xsocket_stream(len_and_sockaddr **lsap);
/* Create server TCP socket bound to bindaddr:port. bindaddr can be NULL,
* numeric IP ("N.N.N.N") or numeric IPv6 address,
* and can have ":PORT" suffix (for IPv6 use "[X:X:...:X]:PORT").
@ -324,12 +327,14 @@ extern int xconnect_stream(const len_and_sockaddr *lsa);
* (depending on host), but in theory nothing prevents e.g.
* UNIX socket address being returned, IPX sockaddr etc... */
extern len_and_sockaddr* host2sockaddr(const char *host, int port);
/* assign sin[6]_port member if the socket is of corresponding type,
/* Assign sin[6]_port member if the socket is of corresponding type,
* otherwise noop. Useful for ftp.
* NB: does NOT do htons() internally, just direct assignment. */
extern void set_port(len_and_sockaddr *lsa, unsigned port);
char* xmalloc_sockaddr2host(const struct sockaddr *sa, socklen_t salen);
char* xmalloc_sockaddr2dotted(const struct sockaddr *sa, socklen_t salen);
extern void set_nport(len_and_sockaddr *lsa, unsigned port);
/* Retrieve sin[6]_port or return -1 for non-inet lsa's */
extern int get_nport(len_and_sockaddr *lsa);
extern char* xmalloc_sockaddr2host(const struct sockaddr *sa, socklen_t salen);
extern char* xmalloc_sockaddr2dotted(const struct sockaddr *sa, socklen_t salen);
extern char *xstrdup(const char *s);

2
include/usage.h
View File

@ -2249,7 +2249,7 @@
"\n -e Exec rest of command line after connect" \
"\n -i SECS Delay interval for lines sent" \
"\n -w SECS Timeout for connect" \
"\n -f file Use file (ala /dev/ttyS0) instead of network" \
"\n -f FILE Use file (ala /dev/ttyS0) instead of network" \
) \
USE_NC_SERVER( \
"\n -l Listen mode, for inbound connects" \

50
libbb/xconnect.c
View File

@ -32,7 +32,7 @@ void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
}
}
/* Return network byte ordered port number for a service.
/* Return port number for a service.
* If "port" is a number use it as the port.
* If "port" is a name it is looked up in /etc/services, if it isnt found return
* default_port */
@ -81,7 +81,21 @@ int xconnect_tcp_v4(struct sockaddr_in *s_addr)
/* "New" networking API */
void set_port(len_and_sockaddr *lsa, unsigned port)
int get_nport(len_and_sockaddr *lsa)
{
#if ENABLE_FEATURE_IPV6
if (lsa->sa.sa_family == AF_INET6) {
return lsa->sin6.sin6_port;
}
#endif
if (lsa->sa.sa_family == AF_INET) {
return lsa->sin.sin_port;
}
return -1;
/* What? UNIX socket? IPX?? :) */
}
void set_nport(len_and_sockaddr *lsa, unsigned port)
{
#if ENABLE_FEATURE_IPV6
if (lsa->sa.sa_family == AF_INET6) {
@ -146,7 +160,7 @@ static len_and_sockaddr* str2sockaddr(const char *host, int port, int ai_flags)
r = xmalloc(offsetof(len_and_sockaddr, sa) + result->ai_addrlen);
r->len = result->ai_addrlen;
memcpy(&r->sa, result->ai_addr, result->ai_addrlen);
set_port(r, htons(port));
set_nport(r, htons(port));
freeaddrinfo(result);
return r;
}
@ -161,19 +175,27 @@ static len_and_sockaddr* dotted2sockaddr(const char *host, int port)
return str2sockaddr(host, port, NI_NUMERICHOST);
}
static int xsocket_stream(len_and_sockaddr *lsa)
int xsocket_stream(len_and_sockaddr **lsap)
{
len_and_sockaddr *lsa;
int fd;
int len = sizeof(struct sockaddr_in);
int family = AF_INET;
#if ENABLE_FEATURE_IPV6
fd = socket(AF_INET6, SOCK_STREAM, 0);
lsa->sa.sa_family = AF_INET6;
lsa->len = sizeof(struct sockaddr_in6);
if (fd >= 0)
return fd;
if (fd >= 0) {
len = sizeof(struct sockaddr_in6);
family = AF_INET6;
} else
#endif
fd = xsocket(AF_INET, SOCK_STREAM, 0);
lsa->sa.sa_family = AF_INET;
lsa->len = sizeof(struct sockaddr_in);
{
fd = xsocket(AF_INET, SOCK_STREAM, 0);
}
lsa = xzalloc(offsetof(len_and_sockaddr, sa) + len);
lsa->len = len;
lsa->sa.sa_family = family;
*lsap = lsa;
return fd;
}
@ -190,11 +212,7 @@ int create_and_bind_stream_or_die(const char *bindaddr, int port)
/* user specified bind addr dictates family */
fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
} else {
lsa = xzalloc(offsetof(len_and_sockaddr, sa) +
USE_FEATURE_IPV6(sizeof(struct sockaddr_in6))
SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in))
);
fd = xsocket_stream(lsa);
fd = xsocket_stream(&lsa);
}
setsockopt_reuseaddr(fd);
xbind(fd, &lsa->sa, lsa->len);

2
networking/ftpgetput.c
View File

@ -88,7 +88,7 @@ static int xconnect_ftpdata(ftp_host_info_t *server, char *buf)
*buf_ptr = '\0';
port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
set_port(server->lsa, htons(port_num));
set_nport(server->lsa, htons(port_num));
return xconnect_stream(server->lsa);
}

101
networking/nc.c
View File

@ -9,6 +9,10 @@
#include "busybox.h"
/* Lots of small differences in features
* when compared to "standard" nc
*/
static void timeout(int signum)
{
bb_error_msg_and_die("timed out");
@ -16,7 +20,8 @@ static void timeout(int signum)
int nc_main(int argc, char **argv)
{
int sfd = 0;
/* sfd sits _here_ only because of "repeat" option (-l -l). */
int sfd = sfd; /* for gcc */
int cfd = 0;
SKIP_NC_SERVER(const) unsigned do_listen = 0;
SKIP_NC_SERVER(const) unsigned lport = 0;
@ -24,12 +29,10 @@ int nc_main(int argc, char **argv)
SKIP_NC_EXTRA (const) unsigned delay = 0;
SKIP_NC_EXTRA (const int execparam = 0;)
USE_NC_EXTRA (char **execparam = NULL;)
struct sockaddr_in address;
len_and_sockaddr *lsa;
fd_set readfds, testfds;
int opt; /* must be signed (getopt returns -1) */
memset(&address, 0, sizeof(address));
if (ENABLE_NC_SERVER || ENABLE_NC_EXTRA) {
/* getopt32 is _almost_ usable:
** it cannot handle "... -e prog -prog-opt" */
@ -39,7 +42,6 @@ int nc_main(int argc, char **argv)
if (ENABLE_NC_SERVER && opt=='l') USE_NC_SERVER(do_listen++);
else if (ENABLE_NC_SERVER && opt=='p') {
USE_NC_SERVER(lport = bb_lookup_port(optarg, "tcp", 0));
USE_NC_SERVER(lport = htons(lport));
}
else if (ENABLE_NC_EXTRA && opt=='w') USE_NC_EXTRA( wsecs = xatou(optarg));
else if (ENABLE_NC_EXTRA && opt=='i') USE_NC_EXTRA( delay = xatou(optarg));
@ -71,9 +73,11 @@ int nc_main(int argc, char **argv)
// -l and -f don't mix
if (do_listen && cfd) bb_show_usage();
// Listen or file modes need zero arguments, client mode needs 2
opt = ((do_listen || cfd) ? 0 : 2);
if (argc != opt)
bb_show_usage();
if (do_listen || cfd) {
if (argc) bb_show_usage();
} else {
if (!argc || argc > 2) bb_show_usage();
}
} else {
if (argc != 3) bb_show_usage();
argc--;
@ -86,46 +90,37 @@ int nc_main(int argc, char **argv)
}
if (!cfd) {
sfd = xsocket(AF_INET, SOCK_STREAM, 0);
fcntl(sfd, F_SETFD, FD_CLOEXEC);
setsockopt_reuseaddr(sfd);
address.sin_family = AF_INET;
// Set local port.
if (lport != 0) {
address.sin_port = lport;
xbind(sfd, (struct sockaddr *) &address, sizeof(address));
}
if (do_listen) {
socklen_t addrlen = sizeof(address);
xlisten(sfd, do_listen);
// If we didn't specify a port number, query and print it to stderr.
socklen_t addrlen;
/* create_and_bind_stream_or_die(NULL, lport)
* would've work wonderfully, but we need
* to know lsa */
sfd = xsocket_stream(&lsa);
if (lport)
set_nport(lsa, htons(lport));
setsockopt_reuseaddr(sfd);
xbind(sfd, &lsa->sa, lsa->len);
xlisten(sfd, do_listen); /* can be > 1 */
/* If we didn't specify a port number,
* query and print it after listen() */
if (!lport) {
socklen_t len = sizeof(address);
getsockname(sfd, (struct sockaddr *) &address, &len);
fdprintf(2, "%d\n", SWAP_BE16(address.sin_port));
addrlen = lsa->len;
getsockname(sfd, &lsa->sa, &addrlen);
lport = get_nport(lsa);
fdprintf(2, "%d\n", ntohs(lport));
}
repeatyness:
cfd = accept(sfd, (struct sockaddr *) &address, &addrlen);
fcntl(sfd, F_SETFD, FD_CLOEXEC);
accept_again:
addrlen = lsa->len;
cfd = accept(sfd, NULL, 0); /* &lsa->sa, &addrlen); */
if (cfd < 0)
bb_perror_msg_and_die("accept");
if (!execparam) close(sfd);
if (!execparam)
close(sfd);
} else {
struct hostent *hostinfo;
hostinfo = xgethostbyname(argv[0]);
address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
address.sin_port = bb_lookup_port(argv[1], "tcp", 0);
address.sin_port = htons(address.sin_port);
xconnect(sfd, (struct sockaddr *) &address, sizeof(address));
cfd = sfd;
cfd = create_and_connect_stream_or_die(argv[0],
argv[1] ? bb_lookup_port(argv[1], "tcp", 0) : 0);
}
}
@ -136,17 +131,10 @@ int nc_main(int argc, char **argv)
/* -e given? */
if (execparam) {
if (cfd) {
signal(SIGCHLD, SIG_IGN);
dup2(cfd, 0);
close(cfd);
}
dup2(0, 1);
dup2(0, 2);
signal(SIGCHLD, SIG_IGN);
// With more than one -l, repeatedly act as server.
if (do_listen > 1 && vfork()) {
/* parent */
// This is a bit weird as cleanup goes, since we wind up with no
// stdin/stdout/stderr. But it's small and shouldn't hurt anything.
// We check for cfd == 0 above.
@ -154,9 +142,15 @@ int nc_main(int argc, char **argv)
close(0);
close(1);
close(2);
goto repeatyness;
goto accept_again;
}
/* child (or main thread if no multiple -l) */
if (cfd) {
dup2(cfd, 0);
close(cfd);
}
dup2(0, 1);
dup2(0, 2);
USE_NC_EXTRA(execvp(execparam[0], execparam);)
/* Don't print stuff or it will go over the wire.... */
_exit(127);
@ -184,7 +178,8 @@ int nc_main(int argc, char **argv)
sizeof(bb_common_bufsiz1));
if (fd == cfd) {
if (nread<1) exit(0);
if (nread < 1)
exit(0);
ofd = STDOUT_FILENO;
} else {
if (nread<1) {

2
networking/wget.c
View File

@ -432,7 +432,7 @@ int wget_main(int argc, char **argv)
s = strrchr(buf, ',');
if (!s) goto pasv_error;
port += xatou_range(s+1, 0, 255) * 256;
set_port(lsa, htons(port));
set_nport(lsa, htons(port));
dfp = open_socket(lsa);
if (beg_range) {