Mercurial > hg > nginx-quic
annotate src/os/win32/ngx_wsarecv_chain.c @ 7983:39501ce97e29
gRPC: generate error when response size is wrong.
As long as the "Content-Length" header is given, we now make sure
it exactly matches the size of the response. If it doesn't,
the response is considered malformed and must not be forwarded
(https://tools.ietf.org/html/rfc7540#section-8.1.2.6). While it
is not really possible to "not forward" the response which is already
being forwarded, we generate an error instead, which is the closest
equivalent.
Previous behaviour was to pass everything to the client, but this
seems to be suboptimal and causes issues (ticket #1695). Also this
directly contradicts HTTP/2 specification requirements.
Note that the new behaviour for the gRPC proxy is more strict than that
applied in other variants of proxying. This is intentional, as HTTP/2
specification requires us to do so, while in other types of proxying
malformed responses from backends are well known and historically
tolerated.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 06 Jul 2020 18:36:25 +0300 |
parents | efd71d49bde0 |
children | ecf2a9002b37 |
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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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 |
577 | 13 #define NGX_WSABUFS 8 |
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 { |
501 | 60 wsabuf = ngx_array_push(&vec); |
61 if (wsabuf == NULL) { | |
62 return NGX_ERROR; | |
63 } | |
64 | |
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65 wsabuf->buf = (char *) chain->buf->last; |
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66 wsabuf->len = n; |
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67 } |
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68 |
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69 size += n; |
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70 prev = chain->buf->end; |
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71 chain = chain->next; |
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72 } |
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73 |
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74 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 75 "WSARecv: %d:%d", vec.nelts, wsabuf->len); |
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76 |
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77 |
501 | 78 rc = WSARecv(c->fd, vec.elts, vec.nelts, &bytes, &flags, NULL, NULL); |
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79 |
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80 rev = c->read; |
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81 |
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82 if (rc == -1) { |
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83 rev->ready = 0; |
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84 err = ngx_socket_errno; |
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85 |
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86 if (err == WSAEWOULDBLOCK) { |
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87 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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88 "WSARecv() not ready"); |
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89 return NGX_AGAIN; |
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90 } |
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91 |
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92 rev->error = 1; |
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93 ngx_connection_error(c, err, "WSARecv() failed"); |
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94 return NGX_ERROR; |
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95 } |
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96 |
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97 #if (NGX_HAVE_FIONREAD) |
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98 |
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99 if (rev->available >= 0 && bytes > 0) { |
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100 rev->available -= bytes; |
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101 |
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102 /* |
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103 * negative rev->available means some additional bytes |
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104 * were received between kernel notification and WSARecv(), |
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105 * and therefore ev->ready can be safely reset even for |
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106 * edge-triggered event methods |
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107 */ |
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108 |
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109 if (rev->available < 0) { |
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110 rev->available = 0; |
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111 rev->ready = 0; |
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112 } |
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113 |
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114 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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115 "WSARecv: avail:%d", rev->available); |
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116 |
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117 } else if (bytes == size) { |
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118 |
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119 if (ngx_socket_nread(c->fd, &rev->available) == -1) { |
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120 rev->error = 1; |
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Events: available bytes calculation via ioctl(FIONREAD).
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121 ngx_connection_error(c, ngx_socket_errno, |
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Events: available bytes calculation via ioctl(FIONREAD).
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122 ngx_socket_nread_n " failed"); |
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Events: available bytes calculation via ioctl(FIONREAD).
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123 return NGX_ERROR; |
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Events: available bytes calculation via ioctl(FIONREAD).
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124 } |
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Events: available bytes calculation via ioctl(FIONREAD).
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125 |
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Events: available bytes calculation via ioctl(FIONREAD).
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126 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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127 "WSARecv: avail:%d", rev->available); |
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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 #endif |
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Events: available bytes calculation via ioctl(FIONREAD).
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131 |
186
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132 if (bytes < size) { |
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133 rev->ready = 0; |
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134 } |
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135 |
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136 if (bytes == 0) { |
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137 rev->eof = 1; |
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138 } |
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139 |
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140 return bytes; |
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141 } |