Mercurial > hg > nginx-quic
annotate src/os/win32/ngx_wsarecv_chain.c @ 8700:b09f055daa4e quic
QUIC: fixed handling of RETIRE_CONNECTION_ID frame.
Previously, the retired socket was not closed if it didn't match
active or backup.
New sockets could not be created (due to count limit), since retired socket
was not closed before calling ngx_quic_create_sockets().
When replacing retired socket, new socket is only requested after closing
old one, to avoid hitting the limit on the number of active connection ids.
Together with added restrictions, this fixes an issue when a current socket
could be closed during migration, recreated and erroneously reused leading
to null pointer dereference.
author | Vladimir Homutov <vl@nginx.com> |
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date | Thu, 18 Nov 2021 14:19:36 +0300 |
parents | ecf2a9002b37 |
children | 56819a9491fe |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_event.h> |
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11 |
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12 |
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13 #define NGX_WSABUFS 64 |
501 | 14 |
15 | |
16 ssize_t | |
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17 ngx_wsarecv_chain(ngx_connection_t *c, ngx_chain_t *chain, off_t limit) |
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18 { |
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19 int rc; |
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20 u_char *prev; |
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21 u_long bytes, flags; |
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22 size_t n, size; |
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23 ngx_err_t err; |
501 | 24 ngx_array_t vec; |
186
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25 ngx_event_t *rev; |
501 | 26 LPWSABUF wsabuf; |
27 WSABUF wsabufs[NGX_WSABUFS]; | |
186
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28 |
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29 prev = NULL; |
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30 wsabuf = NULL; |
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31 flags = 0; |
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32 size = 0; |
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33 bytes = 0; |
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34 |
501 | 35 vec.elts = wsabufs; |
36 vec.nelts = 0; | |
37 vec.size = sizeof(WSABUF); | |
577 | 38 vec.nalloc = NGX_WSABUFS; |
501 | 39 vec.pool = c->pool; |
186
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40 |
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41 /* coalesce the neighbouring bufs */ |
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42 |
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43 while (chain) { |
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44 n = chain->buf->end - chain->buf->last; |
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45 |
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46 if (limit) { |
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47 if (size >= (size_t) limit) { |
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48 break; |
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49 } |
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50 |
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51 if (size + n > (size_t) limit) { |
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52 n = (size_t) limit - size; |
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53 } |
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54 } |
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55 |
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56 if (prev == chain->buf->last) { |
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57 wsabuf->len += n; |
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58 |
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59 } else { |
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60 if (vec.nelts == vec.nalloc) { |
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61 break; |
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62 } |
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63 |
501 | 64 wsabuf = ngx_array_push(&vec); |
65 if (wsabuf == NULL) { | |
66 return NGX_ERROR; | |
67 } | |
68 | |
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69 wsabuf->buf = (char *) chain->buf->last; |
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70 wsabuf->len = n; |
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71 } |
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72 |
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73 size += n; |
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74 prev = chain->buf->end; |
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75 chain = chain->next; |
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76 } |
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77 |
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78 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 79 "WSARecv: %d:%d", vec.nelts, wsabuf->len); |
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80 |
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81 |
501 | 82 rc = WSARecv(c->fd, vec.elts, vec.nelts, &bytes, &flags, NULL, NULL); |
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83 |
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84 rev = c->read; |
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85 |
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86 if (rc == -1) { |
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87 rev->ready = 0; |
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88 err = ngx_socket_errno; |
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89 |
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90 if (err == WSAEWOULDBLOCK) { |
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91 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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92 "WSARecv() not ready"); |
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93 return NGX_AGAIN; |
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94 } |
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95 |
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96 rev->error = 1; |
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97 ngx_connection_error(c, err, "WSARecv() failed"); |
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98 return NGX_ERROR; |
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99 } |
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100 |
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101 #if (NGX_HAVE_FIONREAD) |
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102 |
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103 if (rev->available >= 0 && bytes > 0) { |
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104 rev->available -= bytes; |
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105 |
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106 /* |
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107 * negative rev->available means some additional bytes |
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108 * were received between kernel notification and WSARecv(), |
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109 * and therefore ev->ready can be safely reset even for |
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110 * edge-triggered event methods |
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111 */ |
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112 |
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113 if (rev->available < 0) { |
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114 rev->available = 0; |
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115 rev->ready = 0; |
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116 } |
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117 |
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118 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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119 "WSARecv: avail:%d", rev->available); |
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120 |
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121 } else if (bytes == size) { |
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122 |
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Events: available bytes calculation via ioctl(FIONREAD).
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123 if (ngx_socket_nread(c->fd, &rev->available) == -1) { |
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Events: available bytes calculation via ioctl(FIONREAD).
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124 rev->error = 1; |
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Events: available bytes calculation via ioctl(FIONREAD).
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125 ngx_connection_error(c, ngx_socket_errno, |
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Events: available bytes calculation via ioctl(FIONREAD).
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126 ngx_socket_nread_n " failed"); |
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Events: available bytes calculation via ioctl(FIONREAD).
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127 return NGX_ERROR; |
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Events: available bytes calculation via ioctl(FIONREAD).
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128 } |
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Events: available bytes calculation via ioctl(FIONREAD).
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129 |
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Events: available bytes calculation via ioctl(FIONREAD).
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130 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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Events: available bytes calculation via ioctl(FIONREAD).
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131 "WSARecv: avail:%d", rev->available); |
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Events: available bytes calculation via ioctl(FIONREAD).
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132 } |
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Events: available bytes calculation via ioctl(FIONREAD).
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133 |
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134 #endif |
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135 |
186
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136 if (bytes < size) { |
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137 rev->ready = 0; |
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138 } |
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139 |
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140 if (bytes == 0) { |
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141 rev->eof = 1; |
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142 } |
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143 |
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144 return bytes; |
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145 } |