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fetch(3): move bits of fetch_socks5_getenv around

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This commit separates out port parsing and validation from grabbing the host
from the env var. The only related bit really is that we need to be more
specific with the delimiter in the IPv6 case.
This commit is contained in:
Kyle Evans 2020-02-15 19:31:40 +00:00
parent bacffcd4b1
commit 0f3fa96016
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357977
1 changed files with 32 additions and 36 deletions
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68
lib/libfetch/common.c
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@ -525,54 +525,50 @@ int
fetch_socks5_getenv(char **host, int *port)
{
char *socks5env, *endptr, *ext;
const char *portDelim;
size_t slen;
portDelim = ":";
if ((socks5env = getenv("SOCKS5_PROXY")) == NULL || *socks5env == '\0') {
*host = NULL;
*port = -1;
return (-1);
}
/* IPv6 addresses begin and end in brackets */
/*
* IPv6 addresses begin and end in brackets. Set the port delimiter
* accordingly and search for it so we can do appropriate validation.
*/
if (socks5env[0] == '[')
portDelim = "]:";
slen = strlen(socks5env);
ext = strstr(socks5env, portDelim);
if (socks5env[0] == '[') {
if (socks5env[strlen(socks5env) - 1] == ']') {
*host = strndup(socks5env, strlen(socks5env));
if (socks5env[slen - 1] == ']') {
*host = strndup(socks5env, slen);
if (*host == NULL)
goto fail;
*port = 1080; /* Default port as defined in RFC1928 */
} else {
ext = strstr(socks5env, "]:");
if (ext == NULL) {
socks5_seterr(SOCKS5_ERR_BAD_PROXY_FORMAT);
return (0);
}
ext=ext+1;
*host = strndup(socks5env, ext - socks5env);
if (*host == NULL)
goto fail;
errno = 0;
*port = strtoimax(ext + 1, (char **)&endptr, 10);
if (*endptr != '\0' || errno != 0 || *port < 0 ||
*port > 65535) {
socks5_seterr(SOCKS5_ERR_BAD_PORT);
return (0);
}
} else if (ext == NULL) {
socks5_seterr(SOCKS5_ERR_BAD_PROXY_FORMAT);
return (0);
}
} else {
ext = strrchr(socks5env, ':');
if (ext == NULL) {
*host = strdup(socks5env);
*port = 1080;
} else {
*host = strndup(socks5env, ext-socks5env);
if (*host == NULL)
goto fail;
errno = 0;
*port = strtoimax(ext + 1, (char **)&endptr, 10);
if (*endptr != '\0' || errno != 0 || *port < 0 ||
*port > 65535) {
socks5_seterr(SOCKS5_ERR_BAD_PORT);
return (0);
}
*host = strndup(socks5env, ext - socks5env);
if (*host == NULL)
goto fail;
}
if (ext == NULL) {
*port = 1080; /* Default port as defined in RFC1928 */
} else {
ext += strlen(portDelim);
errno = 0;
*port = strtoimax(ext, (char **)&endptr, 10);
if (*endptr != '\0' || errno != 0 || *port < 0 ||
*port > 65535) {
socks5_seterr(SOCKS5_ERR_BAD_PORT);
return (0);
}
}