1 | /* |
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2 | * |
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3 | * Various SNAC-related dodads... |
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4 | * |
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5 | * outstanding_snacs is a list of aim_snac_t structs. A SNAC should be added |
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6 | * whenever a new SNAC is sent and it should remain in the list until the |
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7 | * response for it has been receieved. |
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8 | * |
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9 | * cleansnacs() should be called periodically by the client in order |
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10 | * to facilitate the aging out of unreplied-to SNACs. This can and does |
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11 | * happen, so it should be handled. |
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12 | * |
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13 | */ |
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14 | |
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15 | #define FAIM_INTERNAL |
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16 | #include <aim.h> |
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17 | |
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18 | /* |
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19 | * Called from aim_session_init() to initialize the hash. |
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20 | */ |
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21 | faim_internal void aim_initsnachash(aim_session_t *sess) |
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22 | { |
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23 | int i; |
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24 | |
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25 | for (i = 0; i < FAIM_SNAC_HASH_SIZE; i++) |
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26 | sess->snac_hash[i] = NULL; |
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27 | |
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28 | return; |
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29 | } |
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30 | |
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31 | faim_internal aim_snacid_t aim_cachesnac(aim_session_t *sess, const fu16_t family, const fu16_t type, const fu16_t flags, const void *data, const int datalen) |
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32 | { |
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33 | aim_snac_t snac; |
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34 | |
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35 | snac.id = sess->snacid_next++; |
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36 | snac.family = family; |
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37 | snac.type = type; |
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38 | snac.flags = flags; |
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39 | |
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40 | if (datalen) { |
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41 | if (!(snac.data = malloc(datalen))) |
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42 | return 0; /* er... */ |
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43 | memcpy(snac.data, data, datalen); |
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44 | } else |
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45 | snac.data = NULL; |
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46 | |
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47 | return aim_newsnac(sess, &snac); |
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48 | } |
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49 | |
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50 | /* |
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51 | * Clones the passed snac structure and caches it in the |
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52 | * list/hash. |
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53 | */ |
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54 | faim_internal aim_snacid_t aim_newsnac(aim_session_t *sess, aim_snac_t *newsnac) |
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55 | { |
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56 | aim_snac_t *snac; |
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57 | int index; |
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58 | |
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59 | if (!newsnac) |
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60 | return 0; |
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61 | |
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62 | if (!(snac = malloc(sizeof(aim_snac_t)))) |
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63 | return 0; |
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64 | memcpy(snac, newsnac, sizeof(aim_snac_t)); |
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65 | snac->issuetime = time(NULL); |
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66 | |
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67 | index = snac->id % FAIM_SNAC_HASH_SIZE; |
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68 | |
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69 | snac->next = (aim_snac_t *)sess->snac_hash[index]; |
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70 | sess->snac_hash[index] = (void *)snac; |
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71 | |
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72 | return snac->id; |
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73 | } |
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74 | |
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75 | /* |
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76 | * Finds a snac structure with the passed SNAC ID, |
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77 | * removes it from the list/hash, and returns a pointer to it. |
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78 | * |
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79 | * The returned structure must be freed by the caller. |
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80 | * |
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81 | */ |
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82 | faim_internal aim_snac_t *aim_remsnac(aim_session_t *sess, aim_snacid_t id) |
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83 | { |
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84 | aim_snac_t *cur, **prev; |
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85 | int index; |
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86 | |
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87 | index = id % FAIM_SNAC_HASH_SIZE; |
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88 | |
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89 | for (prev = (aim_snac_t **)&sess->snac_hash[index]; (cur = *prev); ) { |
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90 | if (cur->id == id) { |
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91 | *prev = cur->next; |
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92 | return cur; |
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93 | } else |
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94 | prev = &cur->next; |
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95 | } |
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96 | |
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97 | return cur; |
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98 | } |
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99 | |
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100 | /* |
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101 | * This is for cleaning up old SNACs that either don't get replies or |
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102 | * a reply was never received for. Garabage collection. Plain and simple. |
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103 | * |
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104 | * maxage is the _minimum_ age in seconds to keep SNACs. |
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105 | * |
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106 | */ |
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107 | faim_internal void aim_cleansnacs(aim_session_t *sess, int maxage) |
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108 | { |
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109 | int i; |
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110 | |
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111 | for (i = 0; i < FAIM_SNAC_HASH_SIZE; i++) { |
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112 | aim_snac_t *cur, **prev; |
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113 | time_t curtime; |
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114 | |
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115 | if (!sess->snac_hash[i]) |
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116 | continue; |
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117 | |
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118 | curtime = time(NULL); /* done here in case we waited for the lock */ |
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119 | |
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120 | for (prev = (aim_snac_t **)&sess->snac_hash[i]; (cur = *prev); ) { |
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121 | if ((curtime - cur->issuetime) > maxage) { |
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122 | |
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123 | *prev = cur->next; |
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124 | |
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125 | /* XXX should we have destructors here? */ |
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126 | free(cur->data); |
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127 | free(cur); |
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128 | |
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129 | } else |
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130 | prev = &cur->next; |
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131 | } |
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132 | } |
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133 | |
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134 | return; |
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135 | } |
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136 | |
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137 | faim_internal int aim_putsnac(aim_bstream_t *bs, fu16_t family, fu16_t subtype, fu16_t flags, aim_snacid_t snacid) |
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138 | { |
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139 | |
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140 | aimbs_put16(bs, family); |
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141 | aimbs_put16(bs, subtype); |
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142 | aimbs_put16(bs, flags); |
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143 | aimbs_put32(bs, snacid); |
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144 | |
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145 | return 10; |
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146 | } |
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