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Use last X-Forwarded-For header (#367)

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This header is non-standard but AWS seems to need this.
This commit is contained in:
Paul Kulchenko 2022-03-14 17:21:15 -07:00 • committed by GitHub
parent cfc557f7c7
commit 2a938b3eaa
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4 changed files with 16 additions and 5 deletions
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9
net/http/parseforwarded.c
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@ -24,13 +24,13 @@
*
* This header is used by reverse proxies. For example:
*
* X-Forwarded-For: 203.0.113.42:31337
* X-Forwarded-For: 203.0.110.2, 203.0.113.42:31337
*
* The port is optional and will be set to zero if absent.
*
* @param s is input data
* @param n if -1 implies strlen
* @param ip receives ip on success if not NULL
* @param ip receives last/right ip on success if not NULL
* @param port receives port on success if not NULL
* @return 0 on success or -1 on failure
* @see RFC7239's poorly designed Forwarded header
@ -38,10 +38,15 @@
int ParseForwarded(const char *s, size_t n, uint32_t *ip, uint16_t *port) {
int c, t;
size_t i;
char *r;
uint32_t x;
if (n == -1) n = s ? strlen(s) : 0;
if (n) {
t = x = i = 0;
if ((r = strrchr(s, ','))) {
i = r - s;
if ((s[++i] & 255) == ' ') ++i; // skip optional space
}
do {
c = s[i++] & 255;
if (isdigit(c)) {