Mercurial > dovecot > core-2.2

annotate src/master/service.h @ 23017:c1d36f2575c7 default tip

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lib-imap: Fix "Don't accept strings with NULs" cherry-pick
author Timo Sirainen <timo.sirainen@open-xchange.com>
date Thu, 29 Aug 2019 09:55:25 +0300
parents 9d3e4542c309
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #ifndef SERVICE_H
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2 #define SERVICE_H
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3
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4 #include "net.h"
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5 #include "master-settings.h"
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6
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7 /* If a service process doesn't send its first status notification in
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8 this many seconds, kill the process */
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9 #define SERVICE_FIRST_STATUS_TIMEOUT_SECS 30
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11 #define SERVICE_STARTUP_FAILURE_THROTTLE_MIN_SECS 2
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12 #define SERVICE_STARTUP_FAILURE_THROTTLE_MAX_SECS 60
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13
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14 enum service_listener_type {
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15 SERVICE_LISTENER_UNIX,
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16 SERVICE_LISTENER_FIFO,
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17 SERVICE_LISTENER_INET
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18 };
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19
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20 struct service_listener {
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21 struct service *service;
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22
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23 enum service_listener_type type;
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24 int fd; /* may be -1 */
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25 struct io *io;
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26
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27 const char *name;
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28 const char *inet_address;
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29
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30 union {
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31 struct {
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32 const struct file_listener_settings *set;
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33 uid_t uid;
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34 gid_t gid;
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35 } fileset;
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36 struct {
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37 const struct inet_listener_settings *set;
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38 struct ip_addr ip;
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39 } inetset;
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40 } set;
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41
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42 bool reuse_port;
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43 };
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44
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45 struct service {
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46 struct service_list *list;
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47
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48 enum service_type type;
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49
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50 const struct service_settings *set;
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51 const char *config_file_path;
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52
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53 const char *executable;
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54 uid_t uid;
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55 gid_t gid;
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56 gid_t privileged_gid;
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57 const char *extra_gids; /* comma-separated list */
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58
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59 /* all listeners, even those that aren't currently listening */
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60 ARRAY(struct service_listener *) listeners;
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61 /* linked list of all processes belonging to this service */
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62 struct service_process *processes;
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63
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64 /* number of processes currently created for this service */
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65 unsigned int process_count;
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66 /* number of processes currently accepting new clients */
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67 unsigned int process_avail;
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68 /* max number of processes allowed */
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69 unsigned int process_limit;
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70
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71 /* Maximum number of client connections a process can handle. */
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72 unsigned int client_limit;
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73 /* Kill idling processes after this many seconds. */
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74 unsigned int idle_kill;
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75 /* set->vsz_limit or set->master_set->default_client_limit */
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76 uoff_t vsz_limit;
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77
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78 /* log process pipe file descriptors. */
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79 int log_fd[2];
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80 /* fd that log process sees log_fd[0] as. can be used to identify
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81 service name when sending commands via master_log_fd. */
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82 int log_process_internal_fd;
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83
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84 /* status report pipe file descriptors */
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85 int status_fd[2];
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86 struct io *io_status;
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87
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88 int master_dead_pipe_fd[2];
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89
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90 unsigned int throttle_secs;
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91 time_t exit_failure_last;
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92 unsigned int exit_failures_in_sec;
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93
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94 /* Login process's notify fd. We change its seek position to
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95 communicate state to login processes. */
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96 int login_notify_fd;
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97 time_t last_login_notify_time;
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98 struct timeout *to_login_notify;
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99
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100 /* if a process fails before servicing its first request, assume it's
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101 broken and start throtting new process creations */
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102 struct timeout *to_throttle;
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103 /* when process_limit is reached, wait for a while until we actually
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104 start dropping pending connections */
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105 struct timeout *to_drop;
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106
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107 /* prefork processes up to process_min_avail if there's time */
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108 struct timeout *to_prefork;
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109 unsigned int prefork_counter;
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110
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111 /* Last time a "dropping client connections" warning was logged */
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112 time_t last_drop_warning;
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113
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114 /* all processes are in use and new connections are coming */
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115 unsigned int listen_pending:1;
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116 /* service is currently listening for new connections */
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117 unsigned int listening:1;
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118 /* TRUE if service has at least one inet_listener */
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119 unsigned int have_inet_listeners:1;
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120 /* service_login_notify()'s last notification state */
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121 unsigned int last_login_full_notify:1;
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122 /* service has exited at least once with exit code 0 */
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123 unsigned int have_successful_exits:1;
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124 };
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125
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126 struct service_list {
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127 pool_t pool;
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128 pool_t set_pool;
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129 int refcount;
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130 struct timeout *to_kill;
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131 unsigned int fork_counter;
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132
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133 const struct master_settings *set;
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134 const struct master_service_settings *service_set;
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135
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136 struct service *config;
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137 struct service *log;
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138 struct service *anvil;
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139
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140 struct file_listener_settings master_listener_set;
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141 struct io *io_master;
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142 int master_fd;
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143
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144 /* nonblocking log fds usd by master */
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145 int master_log_fd[2];
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146 struct service_process_notify *log_byes;
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147
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148 ARRAY(struct service *) services;
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149
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150 unsigned int destroying:1;
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151 unsigned int destroyed:1;
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152 unsigned int sigterm_sent:1;
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153 unsigned int sigterm_sent_to_log:1;
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154 };
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155
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156 HASH_TABLE_DEFINE_TYPE(pid_process, void *, struct service_process *);
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157 extern HASH_TABLE_TYPE(pid_process) service_pids;
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158
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159 /* Create all services from settings */
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160 int services_create(const struct master_settings *set,
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161 struct service_list **services_r, const char **error_r);
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162
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163 /* Destroy services */
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164 void services_destroy(struct service_list *service_list, bool wait);
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165
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166 void service_list_ref(struct service_list *service_list);
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167 void service_list_unref(struct service_list *service_list);
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168
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169 /* Return path to configuration process socket. */
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170 const char *services_get_config_socket_path(struct service_list *service_list);
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171
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172 /* Send a signal to all processes in a given service */
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173 void service_signal(struct service *service, int signo);
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174 /* Notify all processes (if necessary) that no more connections can be handled
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175 by the service without killing existing connections (TRUE) or that they
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176 can be (FALSE). */
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177 void service_login_notify(struct service *service, bool all_processes_full);
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178
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179 /* Prevent service from launching new processes for a while. */
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180 void service_throttle(struct service *service, unsigned int secs);
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181 /* Time moved backwards. Throttle services that care about time. */
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182 void services_throttle_time_sensitives(struct service_list *list,
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183 unsigned int secs);
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184
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185 /* Find service by name. */
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186 struct service *
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187 service_lookup(struct service_list *service_list, const char *name);
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188 /* Find service by type */
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189 struct service *
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190 service_lookup_type(struct service_list *service_list, enum service_type type);
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191
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192 void service_error(struct service *service, const char *format, ...)
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193 ATTR_FORMAT(2, 3);
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194
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195 void service_pids_init(void);
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196 void service_pids_deinit(void);
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197
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198 #endif