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);
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));
56 info("Received SIGCHLD (signal %d).", signo);
61 info("Signal %d received. Falling back to default action for it.", signo);
62 signal(signo, SIG_DFL);
67 char rundir[FILENAME_MAX + 1] = "/var/run/netdata";
68 char pidfile[FILENAME_MAX + 1] = "";
69 void prepare_rundir() {
71 mkdir("/run/user", 0775);
72 snprintf(rundir, FILENAME_MAX, "/run/user/%d", getuid());
74 snprintf(rundir, FILENAME_MAX, "/run/user/%d/netdata", getuid());
77 snprintf(pidfile, FILENAME_MAX, "%s/netdata.pid", rundir);
79 if(mkdir(rundir, 0775) != 0) {
80 if(errno != EEXIST) fprintf(stderr, "Cannot create directory '%s' (%s).", rundir, strerror(errno));
84 int become_user(const char *username)
86 struct passwd *pw = getpwnam(username);
88 fprintf(stderr, "User %s is not present. Error: %s\n", username, strerror(errno));
92 if(chown(rundir, pw->pw_uid, pw->pw_gid) != 0) {
93 fprintf(stderr, "Cannot chown directory '%s' to user %s. Error: %s\n", rundir, username, strerror(errno));
97 if(setgid(pw->pw_gid) != 0) {
98 fprintf(stderr, "Cannot switch to user's %s group (gid: %d). Error: %s\n", username, pw->pw_gid, strerror(errno));
101 if(setegid(pw->pw_gid) != 0) {
102 fprintf(stderr, "Cannot effectively switch to user's %s group (gid: %d). Error: %s\n", username, pw->pw_gid, strerror(errno));
105 if(setuid(pw->pw_uid) != 0) {
106 fprintf(stderr, "Cannot switch to user %s (uid: %d). Error: %s\n", username, pw->pw_uid, strerror(errno));
109 if(seteuid(pw->pw_uid) != 0) {
110 fprintf(stderr, "Cannot effectively switch to user %s (uid: %d). Error: %s\n", username, pw->pw_uid, strerror(errno));
117 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)
121 // open the files before forking
122 int input_fd = -1, output_fd = -1, error_fd = -1, dev_null = -1;
124 if(input && *input) {
125 if((input_fd = open(input, O_RDONLY, 0666)) == -1) {
126 fprintf(stderr, "Cannot open input file '%s' (%s).", input, strerror(errno));
131 if(output && *output) {
132 if((output_fd = open(output, O_RDWR | O_APPEND | O_CREAT, 0666)) == -1) {
133 fprintf(stderr, "Cannot open output log file '%s' (%s).", output, strerror(errno));
134 if(input_fd != -1) close(input_fd);
139 if(error && *error) {
140 if((error_fd = open(error, O_RDWR | O_APPEND | O_CREAT, 0666)) == -1) {
141 fprintf(stderr, "Cannot open error log file '%s' (%s).", error, strerror(errno));
142 if(input_fd != -1) close(input_fd);
143 if(output_fd != -1) close(output_fd);
148 if(access && *access && access_fd) {
149 if((*access_fd = open(access, O_RDWR | O_APPEND | O_CREAT, 0666)) == -1) {
150 fprintf(stderr, "Cannot open access log file '%s' (%s).", access, strerror(errno));
151 if(input_fd != -1) close(input_fd);
152 if(output_fd != -1) close(output_fd);
153 if(error_fd != -1) close(error_fd);
158 *access_fp = fdopen(*access_fd, "w");
160 fprintf(stderr, "Cannot migrate file's '%s' fd %d (%s).\n", access, *access_fd, strerror(errno));
161 if(input_fd != -1) close(input_fd);
162 if(output_fd != -1) close(output_fd);
163 if(error_fd != -1) close(error_fd);
171 if((dev_null = open("/dev/null", O_RDWR, 0666)) == -1) {
172 perror("Cannot open /dev/null");
173 if(input_fd != -1) close(input_fd);
174 if(output_fd != -1) close(output_fd);
175 if(error_fd != -1) close(error_fd);
176 if(access && access_fd && *access_fd != -1) {
192 perror("cannot fork");
196 exit(0); // the parent
199 // become session leader
203 signal(SIGCHLD, SIG_IGN);
204 signal(SIGHUP, SIG_IGN);
205 signal(SIGWINCH, SIG_IGN);
210 perror("cannot fork");
214 exit(0); // the parent
217 // Set new file permissions
221 if(close_all_files) {
222 for(i = sysconf(_SC_OPEN_MAX); i > 0; i--)
224 ((access_fd && i != *access_fd) || !access_fd)
234 close(STDOUT_FILENO);
235 close(STDERR_FILENO);
238 // put the opened files
239 // to our standard file descriptors
241 if(input_fd != STDIN_FILENO) {
242 dup2(input_fd, STDIN_FILENO);
247 else dup2(dev_null, STDIN_FILENO);
249 if(output_fd != -1) {
250 if(output_fd != STDOUT_FILENO) {
251 dup2(output_fd, STDOUT_FILENO);
256 else dup2(dev_null, STDOUT_FILENO);
259 if(error_fd != STDERR_FILENO) {
260 dup2(error_fd, STDERR_FILENO);
265 else dup2(dev_null, STDERR_FILENO);
268 if(dev_null != STDIN_FILENO && dev_null != STDOUT_FILENO && dev_null != STDERR_FILENO)
271 // generate our pid file
274 int fd = open(pidfile, O_RDWR | O_CREAT, 0666);
277 sprintf(b, "%d\n", getpid());
278 i = write(fd, b, strlen(b));