/*!
* @brief compare IP addresses for equality
*
* @param sa1 (r) pointer to an struct sockaddr
* @param sa2 (r) pointer to an struct sockaddr
*
* @returns Addresses are converted to strings and compared with strcmp and
* the result of strcmp is returned.
*
* @note IPv6 mapped IPv4 addresses are treated as IPv4 addresses.
*/
int compare_ip(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
int ret;
char *ip1;
const char *ip2;
ip1 = strdup(getip_string(sa1));
ip2 = getip_string(sa2);
ret = strcmp(ip1, ip2);
free(ip1);
return ret;
}
static void guess_interface(DSI *dsi, const char *hostname, const char *port)
{
int fd;
char **start, **list;
struct ifreq ifr;
struct sockaddr_in *sa = (struct sockaddr_in *)&dsi->server;
start = list = getifacelist();
if (!start)
return;
fd = socket(PF_INET, SOCK_STREAM, 0);
while (list && *list) {
strlcpy(ifr.ifr_name, *list, sizeof(ifr.ifr_name));
list++;
if (ioctl(dsi->serversock, SIOCGIFFLAGS, &ifr) < 0)
continue;
if (ifr.ifr_flags & (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_SLAVE))
continue;
if (!(ifr.ifr_flags & (IFF_UP | IFF_RUNNING)) )
continue;
if (ioctl(fd, SIOCGIFADDR, &ifr) < 0)
continue;
memset(&dsi->server, 0, sizeof(struct sockaddr_storage));
sa->sin_family = AF_INET;
sa->sin_port = htons(atoi(port));
sa->sin_addr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
LOG(log_info, logtype_dsi, "dsi_tcp: '%s:%s' on interface '%s' will be used instead.",
getip_string((struct sockaddr *)&dsi->server), port, ifr.ifr_name);
goto iflist_done;
}
LOG(log_info, logtype_dsi, "dsi_tcp (Chooser will not select afp/tcp) "
"Check to make sure %s is in /etc/hosts and the correct domain is in "
"/etc/resolv.conf: %s", hostname, strerror(errno));
iflist_done:
close(fd);
freeifacelist(start);
}
/* accept the socket and do a little sanity checking */
static int dsi_tcp_open(DSI *dsi)
{
pid_t pid;
SOCKLEN_T len;
len = sizeof(dsi->client);
dsi->socket = accept(dsi->serversock, (struct sockaddr *) &dsi->client, &len);
#ifdef TCPWRAP
{
struct request_info req;
request_init(&req, RQ_DAEMON, dsi->program, RQ_FILE, dsi->socket, NULL);
fromhost(&req);
if (!hosts_access(&req)) {
LOG(deny_severity, logtype_dsi, "refused connect from %s", eval_client(&req));
close(dsi->socket);
errno = ECONNREFUSED;
dsi->socket = -1;
}
}
#endif /* TCPWRAP */
if (dsi->socket < 0)
return -1;
getitimer(ITIMER_PROF, &itimer);
if (0 == (pid = fork()) ) { /* child */
static struct itimerval timer = {{0, 0}, {DSI_TCPTIMEOUT, 0}};
struct sigaction newact, oldact;
u_int8_t block[DSI_BLOCKSIZ];
size_t stored;
/* Immediateyl mark globally that we're a child now */
parent_or_child = 1;
/* reset signals */
server_reset_signal();
#ifndef DEBUGGING
/* install an alarm to deal with non-responsive connections */
newact.sa_handler = timeout_handler;
sigemptyset(&newact.sa_mask);
newact.sa_flags = 0;
sigemptyset(&oldact.sa_mask);
oldact.sa_flags = 0;
setitimer(ITIMER_PROF, &itimer, NULL);
if ((sigaction(SIGALRM, &newact, &oldact) < 0) ||
(setitimer(ITIMER_REAL, &timer, NULL) < 0)) {
LOG(log_error, logtype_dsi, "dsi_tcp_open: %s", strerror(errno));
exit(EXITERR_SYS);
}
#endif
/* read in commands. this is similar to dsi_receive except
* for the fact that we do some sanity checking to prevent
* delinquent connections from causing mischief. */
/* read in the first two bytes */
len = dsi_stream_read(dsi, block, 2);
if (!len ) {
/* connection already closed, don't log it (normal OSX 10.3 behaviour) */
exit(EXITERR_CLNT);
}
if (len < 2 || (block[0] > DSIFL_MAX) || (block[1] > DSIFUNC_MAX)) {
LOG(log_error, logtype_dsi, "dsi_tcp_open: invalid header");
exit(EXITERR_CLNT);
}
/* read in the rest of the header */
stored = 2;
while (stored < DSI_BLOCKSIZ) {
len = dsi_stream_read(dsi, block + stored, sizeof(block) - stored);
if (len > 0)
stored += len;
else {
LOG(log_error, logtype_dsi, "dsi_tcp_open: stream_read: %s", strerror(errno));
exit(EXITERR_CLNT);
}
}
dsi->header.dsi_flags = block[0];
dsi->header.dsi_command = block[1];
memcpy(&dsi->header.dsi_requestID, block + 2,
sizeof(dsi->header.dsi_requestID));
memcpy(&dsi->header.dsi_code, block + 4, sizeof(dsi->header.dsi_code));
memcpy(&dsi->header.dsi_len, block + 8, sizeof(dsi->header.dsi_len));
memcpy(&dsi->header.dsi_reserved, block + 12,
sizeof(dsi->header.dsi_reserved));
dsi->clientID = ntohs(dsi->header.dsi_requestID);
/* make sure we don't over-write our buffers. */
dsi->cmdlen = min(ntohl(dsi->header.dsi_len), DSI_CMDSIZ);
stored = 0;
while (stored < dsi->cmdlen) {
len = dsi_stream_read(dsi, dsi->commands + stored, dsi->cmdlen - stored);
if (len > 0)
stored += len;
else {
LOG(log_error, logtype_dsi, "dsi_tcp_open: stream_read: %s", strerror(errno));
exit(EXITERR_CLNT);
}
}
/* stop timer and restore signal handler */
#ifndef DEBUGGING
memset(&timer, 0, sizeof(timer));
setitimer(ITIMER_REAL, &timer, NULL);
sigaction(SIGALRM, &oldact, NULL);
#endif
LOG(log_info, logtype_dsi, "AFP/TCP session from %s:%u",
getip_string((struct sockaddr *)&dsi->client),
getip_port((struct sockaddr *)&dsi->client));
}
/* send back our pid */
return pid;
}