17 #include "web_client.h"
18 #include "plugins_d.h"
24 void sig_handler(int signo)
33 debug(D_EXIT, "Signaled exit (signal %d). Errno: %d (%s)", signo, errno, strerror(errno));
34 signal(SIGCHLD, SIG_IGN);
35 signal(SIGPIPE, SIG_IGN);
36 signal(SIGTERM, SIG_IGN);
37 signal(SIGQUIT, SIG_IGN);
38 signal(SIGHUP, SIG_IGN);
39 signal(SIGINT, SIG_IGN);
40 signal(SIGCHLD, SIG_IGN);
43 //unlink("/var/run/netdata.pid");
44 info("NetData exiting. Bye bye...");
49 // this is received when web clients send a reset
51 // info("Ignoring signal %d. Errno: %d (%s)", signo, errno, strerror(errno));
55 info("Signal %d received. Falling back to default action for it.", signo);
56 signal(signo, SIG_DFL);
61 char rundir[FILENAME_MAX + 1] = "/var/run/netdata";
62 char pidfile[FILENAME_MAX + 1] = "";
63 void prepare_rundir() {
65 mkdir("/run/user", 0775);
66 snprintf(rundir, FILENAME_MAX, "/run/user/%d", getuid());
68 snprintf(rundir, FILENAME_MAX, "/run/user/%d/netdata", getuid());
71 snprintf(pidfile, FILENAME_MAX, "%s/netdata.pid", rundir);
73 if(mkdir(rundir, 0775) != 0) {
74 if(errno != EEXIST) fprintf(stderr, "Cannot create directory '%s' (%s).", rundir, strerror(errno));
78 int become_user(const char *username)
80 struct passwd *pw = getpwnam(username);
82 fprintf(stderr, "User %s is not present. Error: %s\n", username, strerror(errno));
86 if(chown(rundir, pw->pw_uid, pw->pw_gid) != 0) {
87 fprintf(stderr, "Cannot chown directory '%s' to user %s. Error: %s\n", rundir, username, strerror(errno));
91 if(setgid(pw->pw_gid) != 0) {
92 fprintf(stderr, "Cannot switch to user's %s group (gid: %d). Error: %s\n", username, pw->pw_gid, strerror(errno));
95 if(setegid(pw->pw_gid) != 0) {
96 fprintf(stderr, "Cannot effectively switch to user's %s group (gid: %d). Error: %s\n", username, pw->pw_gid, strerror(errno));
99 if(setuid(pw->pw_uid) != 0) {
100 fprintf(stderr, "Cannot switch to user %s (uid: %d). Error: %s\n", username, pw->pw_uid, strerror(errno));
103 if(seteuid(pw->pw_uid) != 0) {
104 fprintf(stderr, "Cannot effectively switch to user %s (uid: %d). Error: %s\n", username, pw->pw_uid, strerror(errno));
111 int become_daemon(int close_all_files, const char *input, const char *output, const char *error, const char *access, int *access_fd, FILE **access_fp)
115 // open the files before forking
116 int input_fd = -1, output_fd = -1, error_fd = -1, dev_null = -1;
118 if(input && *input) {
119 if((input_fd = open(input, O_RDONLY, 0666)) == -1) {
120 fprintf(stderr, "Cannot open input file '%s' (%s).", input, strerror(errno));
125 if(output && *output) {
126 if((output_fd = open(output, O_RDWR | O_APPEND | O_CREAT, 0666)) == -1) {
127 fprintf(stderr, "Cannot open output log file '%s' (%s).", output, strerror(errno));
128 if(input_fd != -1) close(input_fd);
133 if(error && *error) {
134 if((error_fd = open(error, O_RDWR | O_APPEND | O_CREAT, 0666)) == -1) {
135 fprintf(stderr, "Cannot open error log file '%s' (%s).", error, strerror(errno));
136 if(input_fd != -1) close(input_fd);
137 if(output_fd != -1) close(output_fd);
142 if(access && *access && access_fd) {
143 if((*access_fd = open(access, O_RDWR | O_APPEND | O_CREAT, 0666)) == -1) {
144 fprintf(stderr, "Cannot open access log file '%s' (%s).", access, strerror(errno));
145 if(input_fd != -1) close(input_fd);
146 if(output_fd != -1) close(output_fd);
147 if(error_fd != -1) close(error_fd);
152 *access_fp = fdopen(*access_fd, "w");
154 fprintf(stderr, "Cannot migrate file's '%s' fd %d (%s).\n", access, *access_fd, strerror(errno));
155 if(input_fd != -1) close(input_fd);
156 if(output_fd != -1) close(output_fd);
157 if(error_fd != -1) close(error_fd);
165 if((dev_null = open("/dev/null", O_RDWR, 0666)) == -1) {
166 perror("Cannot open /dev/null");
167 if(input_fd != -1) close(input_fd);
168 if(output_fd != -1) close(output_fd);
169 if(error_fd != -1) close(error_fd);
170 if(access && access_fd && *access_fd != -1) {
186 perror("cannot fork");
190 exit(0); // the parent
193 // become session leader
197 signal(SIGCHLD, SIG_IGN);
198 signal(SIGHUP, SIG_IGN);
199 signal(SIGWINCH, SIG_IGN);
204 perror("cannot fork");
208 exit(0); // the parent
211 // Set new file permissions
215 if(close_all_files) {
216 for(i = sysconf(_SC_OPEN_MAX); i > 0; i--)
218 ((access_fd && i != *access_fd) || !access_fd)
228 close(STDOUT_FILENO);
229 close(STDERR_FILENO);
232 // put the opened files
233 // to our standard file descriptors
235 if(input_fd != STDIN_FILENO) {
236 dup2(input_fd, STDIN_FILENO);
241 else dup2(dev_null, STDIN_FILENO);
243 if(output_fd != -1) {
244 if(output_fd != STDOUT_FILENO) {
245 dup2(output_fd, STDOUT_FILENO);
250 else dup2(dev_null, STDOUT_FILENO);
253 if(error_fd != STDERR_FILENO) {
254 dup2(error_fd, STDERR_FILENO);
259 else dup2(dev_null, STDERR_FILENO);
262 if(dev_null != STDIN_FILENO && dev_null != STDOUT_FILENO && dev_null != STDERR_FILENO)
265 // generate our pid file
268 int fd = open(pidfile, O_RDWR | O_CREAT, 0666);
271 sprintf(b, "%d\n", getpid());
272 i = write(fd, b, strlen(b));