Mercurial > dovecot > core-2.2

annotate src/anvil/connect-limit.c @ 14918:8eae4e205c82

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Hash table API is now (mostly) type safe.
author Timo Sirainen <tss@iki.fi>
date Sun, 19 Aug 2012 13:55:34 +0300
parents 1ce71b5bc94a
children 96fd2c3bf932
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
14133
ba770cba5598 Updated copyright notices to include year 2012.
Timo Sirainen <tss@iki.fi>
parents: 12782
diff changeset
1 /* Copyright (c) 2009-2012 Dovecot authors, see the included COPYING file */
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2
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3 #include "common.h"
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4 #include "hash.h"
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5 #include "str.h"
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6 #include "strescape.h"
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7 #include "ostream.h"
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8 #include "connect-limit.h"
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9
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10 struct ident_pid {
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11 /* ident string points to ident_hash keys */
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12 const char *ident;
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13 pid_t pid;
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14 unsigned int refcount;
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15 };
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16
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17 struct connect_limit {
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18 /* ident => refcount */
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19 HASH_TABLE(char *, unsigned int) ident_hash;
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20 /* struct ident_pid => struct ident_pid */
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21 HASH_TABLE(struct ident_pid *, struct ident_pid *) ident_pid_hash;
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22 };
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23
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24 static unsigned int ident_pid_hash(const struct ident_pid *i)
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25 {
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26 return str_hash(i->ident) ^ i->pid;
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27 }
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28
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29 static int ident_pid_cmp(const struct ident_pid *i1, const struct ident_pid *i2)
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30 {
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31 if (i1->pid < i2->pid)
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32 return -1;
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33 else if (i1->pid > i2->pid)
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34 return 1;
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35 else
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36 return strcmp(i1->ident, i2->ident);
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37 }
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38
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39 struct connect_limit *connect_limit_init(void)
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40 {
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41 struct connect_limit *limit;
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42
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43 limit = i_new(struct connect_limit, 1);
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44 hash_table_create(&limit->ident_hash, default_pool, 0, str_hash, strcmp);
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45 hash_table_create(&limit->ident_pid_hash, default_pool, 0,
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46 ident_pid_hash, ident_pid_cmp);
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47 return limit;
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48 }
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49
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50 void connect_limit_deinit(struct connect_limit **_limit)
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51 {
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52 struct connect_limit *limit = *_limit;
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53
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54 *_limit = NULL;
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55 hash_table_destroy(&limit->ident_hash);
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56 hash_table_destroy(&limit->ident_pid_hash);
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57 i_free(limit);
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58 }
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59
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60 unsigned int connect_limit_lookup(struct connect_limit *limit,
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61 const char *ident)
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62 {
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63 return hash_table_lookup(limit->ident_hash, ident);
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64 }
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65
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66 void connect_limit_connect(struct connect_limit *limit, pid_t pid,
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67 const char *ident)
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68 {
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69 struct ident_pid *i, lookup_i;
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70 void *orig_key, *orig_value;
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71 char *key;
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72 unsigned int value;
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73
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74 if (!hash_table_lookup_full(limit->ident_hash, ident,
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75 &orig_key, &orig_value)) {
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76 key = i_strdup(ident);
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77 hash_table_insert(limit->ident_hash, key, 1U);
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78 } else {
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79 key = orig_key;
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80 value = POINTER_CAST_TO(orig_value, unsigned int) + 1;
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81 hash_table_update(limit->ident_hash, key, value);
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82 }
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83
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84 lookup_i.ident = ident;
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85 lookup_i.pid = pid;
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86 i = hash_table_lookup(limit->ident_pid_hash, &lookup_i);
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87 if (i == NULL) {
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88 i = i_new(struct ident_pid, 1);
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89 i->ident = key;
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90 i->pid = pid;
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91 i->refcount = 1;
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92 hash_table_insert(limit->ident_pid_hash, i, i);
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93 } else {
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94 i->refcount++;
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95 }
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96 }
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97
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98 static void
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99 connect_limit_ident_hash_unref(struct connect_limit *limit, const char *ident)
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100 {
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101 void *orig_key, *orig_value;
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102 char *key;
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103 unsigned int new_refcount;
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104
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105 if (!hash_table_lookup_full(limit->ident_hash, ident,
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106 &orig_key, &orig_value))
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107 i_panic("connect limit hash tables are inconsistent");
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108
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109 key = orig_key;
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110 new_refcount = POINTER_CAST_TO(orig_value, unsigned int) - 1;
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111 if (new_refcount > 0) {
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112 hash_table_update(limit->ident_hash, key, new_refcount);
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113 } else {
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114 hash_table_remove(limit->ident_hash, key);
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115 i_free(key);
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116 }
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117 }
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118
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119 void connect_limit_disconnect(struct connect_limit *limit, pid_t pid,
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120 const char *ident)
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121 {
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122 struct ident_pid *i, lookup_i;
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123
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124 lookup_i.ident = ident;
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125 lookup_i.pid = pid;
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126
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127 i = hash_table_lookup(limit->ident_pid_hash, &lookup_i);
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128 if (i == NULL) {
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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129 i_error("connect limit: disconnection for unknown "
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130 "pid %s + ident %s", dec2str(pid), ident);
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131 return;
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132 }
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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133
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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134 if (--i->refcount == 0) {
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135 hash_table_remove(limit->ident_pid_hash, i);
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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136 i_free(i);
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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137 }
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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138
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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139 connect_limit_ident_hash_unref(limit, ident);
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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140 }
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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141
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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142 void connect_limit_disconnect_pid(struct connect_limit *limit, pid_t pid)
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143 {
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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144 struct hash_iterate_context *iter;
14918
8eae4e205c82 Hash table API is now (mostly) type safe.
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parents: 14917
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145 struct ident_pid *i, *value;
9235
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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146
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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147 /* this should happen rarely (or never), so this slow implementation
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148 should be fine. */
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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149 iter = hash_table_iterate_init(limit->ident_pid_hash);
14918
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150 while (hash_table_iterate_t(iter, limit->ident_pid_hash, &i, &value)) {
9235
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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151 if (i->pid == pid) {
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152 hash_table_remove(limit->ident_pid_hash, i);
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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parents:
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153 for (; i->refcount > 0; i->refcount--)
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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154 connect_limit_ident_hash_unref(limit, i->ident);
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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155 i_free(i);
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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156 }
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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157 }
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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158 hash_table_iterate_deinit(&iter);
2e2b957f1cca Implemented anvil service, which is used to implement mail_max_userip_connections.
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159 }
10145
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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160
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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161 void connect_limit_dump(struct connect_limit *limit, struct ostream *output)
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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parents: 9235
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162 {
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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parents: 9235
diff changeset
163 struct hash_iterate_context *iter;
14918
8eae4e205c82 Hash table API is now (mostly) type safe.
Timo Sirainen <tss@iki.fi>
parents: 14917
diff changeset
164 struct ident_pid *i, *value;
10145
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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165 string_t *str = t_str_new(256);
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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diff changeset
166
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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parents: 9235
diff changeset
167 iter = hash_table_iterate_init(limit->ident_pid_hash);
14918
8eae4e205c82 Hash table API is now (mostly) type safe.
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parents: 14917
diff changeset
168 while (hash_table_iterate_t(iter, limit->ident_pid_hash, &i, &value)) {
10145
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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parents: 9235
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169 str_truncate(str, 0);
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
Timo Sirainen <tss@iki.fi>
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diff changeset
170 str_tabescape_write(str, i->ident);
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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parents: 9235
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171 str_printfa(str, "\t%ld\t%u\n", (long)i->pid, i->refcount);
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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diff changeset
172 if (o_stream_send(output, str_data(str), str_len(str)) < 0)
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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parents: 9235
diff changeset
173 break;
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
Timo Sirainen <tss@iki.fi>
parents: 9235
diff changeset
174 }
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
Timo Sirainen <tss@iki.fi>
parents: 9235
diff changeset
175 hash_table_iterate_deinit(&iter);
14681
ca37d1577291 Added o_stream_nsend*() and related functions to make delayed error handling safer.
Timo Sirainen <tss@iki.fi>
parents: 14133
diff changeset
176 o_stream_nsend(output, "\n", 1);
10145
1110edddec36 anvil: Added CONNECT-DUMP command to dump connect-limit state.
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parents: 9235
diff changeset
177 }