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// ================================================================ //
// //
// File : common.c //
// Purpose : Common code for server and client //
// //
// Institute of Microbiology (Technical University Munich) //
// http://www.arb-home.de/ //
// //
// ================================================================ //
#include "common.h"
#include <dupstr.h>
#include <arb_cs.h>
#include <arb_msg.h>
#include <arb_assert.h>
#include <netdb.h>
#include <netinet/tcp.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
enum ClientOrServer { AISC_SERVER, AISC_CLIENT };
inline const char *who(ClientOrServer cos) {
switch (cos) {
case AISC_SERVER: return "AISC_SERVER";
case AISC_CLIENT: return "AISC_CLIENT";
}
arb_assert(0);
return "<unknown>";
}
static GB_ERROR common_get_m_id(const char *path, char **m_name, int *id) {
GB_ERROR error = NULL;
if (!path) {
error = "missing hostname:socketid";
}
else {
if (strcmp(path, ":") == 0) {
path = getenv("SOCKET");
if (!path) {
error = "expected environment variable 'SOCKET' (needed to connect to ':')";
}
}
if (!error) {
const char *p = strchr(path, ':');
if (path[0] == '*' || path[0] == ':') { // UNIX MODE
char buffer[128];
if (!p) {
error = "missing ':' in *:socketid";
}
else {
if (p[1] == '~') {
sprintf(buffer, "%s%s", getenv("HOME"), p+2);
*m_name = (char *)strdup(buffer);
}
else {
*m_name = (char *)strdup(p+1);
}
*id = -1;
}
}
else {
if (!p) {
error = "missing ':' in netname:socketid";
}
else {
char *mn = (char *) calloc(sizeof(char), p - path + 1);
strncpy(mn, path, p - path);
/* @@@ falls hier in mn ein der Bereich von path bis p stehen soll, fehlt eine abschliesende 0 am String-Ende
auf jeden Fall erzeugt der folgende strcmp einen (rui) */
if (strcmp(mn, "localhost") == 0) freedup(mn, arb_gethostname());
*m_name = mn;
int i = atoi(p + 1);
if ((i < 1024) || (i > 32000)) {
error = "socketnumber is not in range [1024..32000]";
}
else {
*id = i;
}
}
}
}
}
return error;
}
#define SOCKET_EXISTS_AND_CONNECT_WORKED ""
static GB_ERROR common_open_socket(ClientOrServer cos, const char *path, int delay, int do_connect, int *psocket, char **unix_name) {
char *mach_name = NULL;
int socket_id;
GB_ERROR error = common_get_m_id(path, &mach_name, &socket_id);
if (!error) {
const char one = 1;
if (socket_id >= 0) { // UNIX
sockaddr_in so_ad;
memset((char *)&so_ad, 0, sizeof(sockaddr_in));
*psocket = socket(PF_INET, SOCK_STREAM, 0);
if (*psocket <= 0) {
error = "failed to create socket"; // @@@ reason why
}
else {
struct hostent *he;
arb_gethostbyname(mach_name, he, error);
if (!error) {
// simply take first address
struct in_addr addr;
addr.s_addr = *(int *) (he->h_addr);
so_ad.sin_addr = addr;
so_ad.sin_family = AF_INET;
so_ad.sin_port = htons(socket_id); // @@@ = pb_socket
if (do_connect) {
if (connect(*psocket, (struct sockaddr*)&so_ad, 16)) {
error = SOCKET_EXISTS_AND_CONNECT_WORKED;
}
}
else {
setsockopt(*psocket, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
if (bind(*psocket, (struct sockaddr*)&so_ad, 16)) {
error = "Could not open socket on Server (1)";
}
}
if (!error) {
if (delay == TCP_NODELAY) {
static int optval;
optval = 1;
setsockopt(*psocket, IPPROTO_TCP, TCP_NODELAY, (char *)&optval, 4);
}
*unix_name = 0;
}
}
}
}
else {
struct sockaddr_un so_ad;
*psocket = socket(PF_UNIX, SOCK_STREAM, 0);
if (*psocket <= 0) {
error = "cannot create socket"; // @@@ reason why
}
else {
so_ad.sun_family = AF_UNIX;
strcpy(so_ad.sun_path, mach_name);
if (do_connect) {
if (connect(*psocket, (struct sockaddr*)&so_ad, strlen(mach_name)+2)) {
error = SOCKET_EXISTS_AND_CONNECT_WORKED;
}
}
else {
FILE *test = fopen(mach_name, "r");
if (test) {
struct stat stt;
if (!stat(path, &stt)) {
if (S_ISREG(stt.st_mode)) {
fprintf(stderr, "%X\n", stt.st_mode);
error = "Socket already exists as a file";
}
}
fclose(test);
}
if (!error) {
if (unlink(mach_name) != 0) {
printf("Warning: old socket file '%s' failed to unlink\n", mach_name);
}
if (cos == AISC_SERVER) {
setsockopt(*psocket, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
}
if (bind(*psocket, (struct sockaddr*)&so_ad, strlen(mach_name)+2)) {
error = "Could not open socket on Server (2)"; // @@@ reasons ?
}
if (!error && cos == AISC_SERVER) {
if (chmod(mach_name, 0777)) {
error = "Cannot change mode of socket"; // @@@ reasons!
}
}
}
}
if (!error) reassign(*unix_name, mach_name);
}
}
}
free(mach_name);
if (error && *error) { // real error (see SOCKET_EXISTS_AND_CONNECT_WORKED)
error = GBS_global_string("%s-Error: %s", who(cos), error);
}
return error;
}
const char *aisc_client_open_socket(const char *path, int delay, int do_connect, int *psocket, char **unix_name) {
return common_open_socket(AISC_CLIENT, path, delay, do_connect, psocket, unix_name);
}
const char *aisc_server_open_socket(const char *path, int delay, int do_connect, int *psocket, char **unix_name) { // @@@ rename into aisc_server_open_socket
return common_open_socket(AISC_SERVER, path, delay, do_connect, psocket, unix_name);
}
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