4 // Copyright (c) 1987-2018 by the citadel.org team
6 // This program is open source software. It runs great on the
7 // Linux operating system (and probably elsewhere). You can use,
8 // copy, and run it under the terms of the GNU General Public
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
18 // lingering_close() a`la Apache. see
19 // http://httpd.apache.org/docs/2.0/misc/fin_wait_2.html for rationale
20 int lingering_close(int fd) {
24 struct timeval tv, start;
26 gettimeofday(&start, NULL);
32 gettimeofday(&tv, NULL);
33 tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
34 tv.tv_usec = start.tv_usec - tv.tv_usec;
37 tv.tv_usec += 1000000;
41 i = select(fd + 1, &set, NULL, NULL, &tv);
42 } while (i == -1 && errno == EINTR);
47 i = read(fd, buf, sizeof buf);
48 } while (i != 0 && (i != -1 || errno == EINTR));
54 // This is a generic function to set up a master socket for listening on
55 // a TCP port. The server shuts down if the bind fails. (IPv4/IPv6 version)
57 // ip_addr IP address to bind
58 // port_number port number to bind
59 // queue_len number of incoming connections to allow in the queue
60 int webcit_tcp_server(const char *ip_addr, int port_number, int queue_len) {
61 const char *ipv4broadcast = "0.0.0.0";
64 struct sockaddr_in6 sin6;
65 struct sockaddr_in sin4;
70 memset(&sin6, 0, sizeof(sin6));
71 memset(&sin4, 0, sizeof(sin4));
72 sin6.sin6_family = AF_INET6;
73 sin4.sin_family = AF_INET;
75 if ( (ip_addr == NULL) // any IPv6
76 || (IsEmptyStr(ip_addr))
77 || (!strcmp(ip_addr, "*"))
81 sin6.sin6_addr = in6addr_any;
83 else if (!strcmp(ip_addr, "0.0.0.0")) { // any IPv4
85 sin4.sin_addr.s_addr = INADDR_ANY;
87 else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':'))) { // specific IPv4
89 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
90 syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
94 else { // specific IPv6
97 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
98 syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
103 if (port_number == 0) {
104 syslog(LOG_WARNING, "Cannot start: no port number specified.\n");
107 sin6.sin6_port = htons((u_short) port_number);
108 sin4.sin_port = htons((u_short) port_number);
110 p = getprotobyname("tcp");
112 s = socket(((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
114 if (IsDefault && (errno == EAFNOSUPPORT)) {
116 ip_addr = ipv4broadcast;
119 syslog(LOG_WARNING, "Can't create a listening socket: %s\n", strerror(errno));
123 // Set some socket options that make sense.
125 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
127 if (ip_version == 6) {
128 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
131 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
135 syslog(LOG_ERR, "Can't bind: %s\n", strerror(errno));
140 if (listen(s, queue_len) < 0) {
141 syslog(LOG_ERR, "Can't listen: %s\n", strerror(errno));
149 // Create a Unix domain socket and listen on it
150 // sockpath - file name of the unix domain socket
151 // queue_len - Number of incoming connections to allow in the queue
152 int webcit_uds_server(char *sockpath, int queue_len) {
153 struct sockaddr_un addr;
156 int actual_queue_len;
158 actual_queue_len = queue_len;
159 if (actual_queue_len < 5)
160 actual_queue_len = 5;
162 i = unlink(sockpath);
163 if ((i != 0) && (errno != ENOENT)) {
164 syslog(LOG_WARNING, "webcit: can't unlink %s: %s", sockpath, strerror(errno));
168 memset(&addr, 0, sizeof(addr));
169 addr.sun_family = AF_UNIX;
170 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
172 s = socket(AF_UNIX, SOCK_STREAM, 0);
174 syslog(LOG_WARNING, "webcit: Can't create a unix domain socket: %s", strerror(errno));
178 if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
179 syslog(LOG_WARNING, "webcit: Can't bind: %s", strerror(errno));
184 if (listen(s, actual_queue_len) < 0) {
185 syslog(LOG_WARNING, "webcit: Can't listen: %s", strerror(errno));
190 chmod(sockpath, 0777);