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This is a huge patch that should be a global NOP. For unix type platforms it enables -Wconversion to issue warnings (-> error) for all automatic casts that seem less than ideal but are normally concealed by the toolchain. This is things like passing an int to a size_t argument. Once enabled, I went through all args on my default build (which build most things) and tried to make the removed default cast explicit. With that approach it neither change nor bloat the code, since it compiles to whatever it was doing before, just with the casts made explicit... in a few cases I changed some length args from int to size_t but largely left the causes alone. From now on, new code that is relying on less than ideal casting will complain and nudge me to improve it by warnings.
209 lines
4.9 KiB
C
209 lines
4.9 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* RFC7231 date string generation and parsing
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*/
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#include "private-lib-core.h"
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/*
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* To avoid needless pointers, we encode these in one string using the fact
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* they're 3 chars each to index it
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*/
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static const char *const s =
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"JanFebMarAprMayJunJulAugSepOctNovDecMonTueWedThuFriSatSun";
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static int
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lws_http_date_render(char *buf, size_t len, const struct tm *tm)
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{
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const char *w = s + 36 + (3 * tm->tm_wday), *m = s + (3 * tm->tm_mon);
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if (len < 29)
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return -1;
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lws_snprintf(buf, len, "%c%c%c, %02d %c%c%c %d %02d:%02d:%02d GMT",
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w[0], w[1], w[2], tm->tm_mday, m[0], m[1], m[2],
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1900 + tm->tm_year, tm->tm_hour, tm->tm_min, tm->tm_sec);
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return 0;
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}
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int
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lws_http_date_render_from_unix(char *buf, size_t len, const time_t *t)
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{
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struct tm *tm = gmtime(t);
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if (lws_http_date_render(buf, len, tm))
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return -1;
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return 0;
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}
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static int
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lws_http_date_parse(const char *b, size_t len, struct tm *tm)
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{
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int n;
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if (len < 29)
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return -1;
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/*
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* We reject anything that isn't a properly-formatted RFC7231 date, eg
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*
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* Tue, 15 Nov 1994 08:12:31 GMT
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*/
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if (b[3] != ',' || b[4] != ' ' || b[7] != ' ' || b[11] != ' ' ||
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b[16] != ' ' || b[19] != ':' || b[22] != ':' || b[25] != ' ' ||
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b[26] != 'G' || b[27] != 'M' || b[28] != 'T')
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return -1;
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memset(tm, 0, sizeof(*tm));
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for (n = 36; n < 57; n += 3)
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if (b[0] == s[n] && b[1] == s[n + 1] && b[2] == s[n + 2])
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break;
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else
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tm->tm_wday++;
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if (n == 57)
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return -1;
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for (n = 0; n < 36; n += 3)
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if (b[8] == s[n] && b[9] == s[n + 1] && b[10] == s[n + 2])
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break;
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else
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tm->tm_mon++;
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if (n == 36)
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return -1;
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tm->tm_mday = atoi(b + 5);
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n = atoi(b + 12);
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if (n < 1900)
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return -1;
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tm->tm_year = n - 1900;
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n = atoi(b + 17);
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if (n < 0 || n > 23)
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return -1;
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tm->tm_hour = n;
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n = atoi(b + 20);
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if (n < 0 || n > 60)
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return -1;
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tm->tm_min = n;
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n = atoi(b + 23);
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if (n < 0 || n > 61) /* leap second */
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return -1;
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tm->tm_sec = n;
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return 0;
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}
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int
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lws_http_date_parse_unix(const char *b, size_t len, time_t *t)
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{
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struct tm tm;
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if (lws_http_date_parse(b, len, &tm))
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return -1;
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*t = mktime(&tm);
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return (int)*t == -1 ? -1 : 0;
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}
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#if defined(LWS_WITH_CLIENT)
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int
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lws_http_check_retry_after(struct lws *wsi, lws_usec_t *us_interval_in_out)
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{
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size_t len = (unsigned int)lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_RETRY_AFTER);
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char *p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_RETRY_AFTER);
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lws_usec_t u;
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time_t t, td;
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if (!p)
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return 1;
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/*
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* There are two arg styles for RETRY_AFTER specified in RFC7231 7.1.3,
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* either a full absolute second-resolution date/time, or an integer
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* interval
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*
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* Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
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* Retry-After: 120
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*/
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if (len < 9)
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u = ((lws_usec_t)(time_t)atoi(p)) * LWS_USEC_PER_SEC;
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else {
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if (lws_http_date_parse_unix(p, len, &t))
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return 1;
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/*
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* If possible, look for DATE from the server as well, so we
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* can calculate the interval it thinks it is giving us,
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* eliminating problems from server - client clock skew
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*/
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time(&td);
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len = (unsigned int)lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_DATE);
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if (len) {
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p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_DATE);
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/* if this fails, it leaves td as client time */
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(void)lws_http_date_parse_unix(p, len, &td);
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}
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if (td >= t)
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/*
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* if he's effectively giving us a 0 or negative
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* interval, just ignore the whole thing and keep the
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* incoming interval
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*/
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return 1;
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u = ((lws_usec_t)(t - td)) * LWS_USEC_PER_SEC;
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}
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/*
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* We are only willing to increase the incoming interval, not
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* decrease it
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*/
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if (u < *us_interval_in_out)
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/* keep the incoming interval */
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return 1;
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/* use the computed interval */
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*us_interval_in_out = u;
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return 0;
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}
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#endif
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