git/http.c

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#include "http.h"
int data_received;
int active_requests = 0;
#ifdef USE_CURL_MULTI
static int max_requests = -1;
static CURLM *curlm;
#endif
#ifndef NO_CURL_EASY_DUPHANDLE
static CURL *curl_default;
#endif
char curl_errorstr[CURL_ERROR_SIZE];
static int curl_ssl_verify = -1;
static const char *ssl_cert = NULL;
#if LIBCURL_VERSION_NUM >= 0x070902
static const char *ssl_key = NULL;
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
static const char *ssl_capath = NULL;
#endif
static const char *ssl_cainfo = NULL;
static long curl_low_speed_limit = -1;
static long curl_low_speed_time = -1;
static int curl_ftp_no_epsv = 0;
static const char *curl_http_proxy = NULL;
static struct curl_slist *pragma_header;
static struct active_request_slot *active_queue_head = NULL;
size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
{
size_t size = eltsize * nmemb;
struct buffer *buffer = buffer_;
if (size > buffer->buf.len - buffer->posn)
size = buffer->buf.len - buffer->posn;
memcpy(ptr, buffer->buf.buf + buffer->posn, size);
buffer->posn += size;
return size;
}
size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
{
size_t size = eltsize * nmemb;
struct strbuf *buffer = buffer_;
strbuf_add(buffer, ptr, size);
data_received++;
return size;
}
size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
{
data_received++;
return eltsize * nmemb;
}
static void finish_active_slot(struct active_request_slot *slot);
#ifdef USE_CURL_MULTI
static void process_curl_messages(void)
{
int num_messages;
struct active_request_slot *slot;
CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
while (curl_message != NULL) {
if (curl_message->msg == CURLMSG_DONE) {
int curl_result = curl_message->data.result;
slot = active_queue_head;
while (slot != NULL &&
slot->curl != curl_message->easy_handle)
slot = slot->next;
if (slot != NULL) {
curl_multi_remove_handle(curlm, slot->curl);
slot->curl_result = curl_result;
finish_active_slot(slot);
} else {
fprintf(stderr, "Received DONE message for unknown request!\n");
}
} else {
fprintf(stderr, "Unknown CURL message received: %d\n",
(int)curl_message->msg);
}
curl_message = curl_multi_info_read(curlm, &num_messages);
}
}
#endif
static int http_options(const char *var, const char *value, void *cb)
{
if (!strcmp("http.sslverify", var)) {
if (curl_ssl_verify == -1) {
curl_ssl_verify = git_config_bool(var, value);
}
return 0;
}
if (!strcmp("http.sslcert", var)) {
if (ssl_cert == NULL)
return git_config_string(&ssl_cert, var, value);
return 0;
}
#if LIBCURL_VERSION_NUM >= 0x070902
if (!strcmp("http.sslkey", var)) {
if (ssl_key == NULL)
return git_config_string(&ssl_key, var, value);
return 0;
}
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
if (!strcmp("http.sslcapath", var)) {
if (ssl_capath == NULL)
return git_config_string(&ssl_capath, var, value);
return 0;
}
#endif
if (!strcmp("http.sslcainfo", var)) {
if (ssl_cainfo == NULL)
return git_config_string(&ssl_cainfo, var, value);
return 0;
}
#ifdef USE_CURL_MULTI
if (!strcmp("http.maxrequests", var)) {
if (max_requests == -1)
max_requests = git_config_int(var, value);
return 0;
}
#endif
if (!strcmp("http.lowspeedlimit", var)) {
if (curl_low_speed_limit == -1)
curl_low_speed_limit = (long)git_config_int(var, value);
return 0;
}
if (!strcmp("http.lowspeedtime", var)) {
if (curl_low_speed_time == -1)
curl_low_speed_time = (long)git_config_int(var, value);
return 0;
}
if (!strcmp("http.noepsv", var)) {
curl_ftp_no_epsv = git_config_bool(var, value);
return 0;
}
if (!strcmp("http.proxy", var)) {
if (curl_http_proxy == NULL)
return git_config_string(&curl_http_proxy, var, value);
return 0;
}
/* Fall back on the default ones */
return git_default_config(var, value, cb);
}
static CURL* get_curl_handle(void)
{
CURL* result = curl_easy_init();
if (!curl_ssl_verify) {
curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
} else {
/* Verify authenticity of the peer's certificate */
curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
/* The name in the cert must match whom we tried to connect */
curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
}
#if LIBCURL_VERSION_NUM >= 0x070907
curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
#endif
if (ssl_cert != NULL)
curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
#if LIBCURL_VERSION_NUM >= 0x070902
if (ssl_key != NULL)
curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
if (ssl_capath != NULL)
curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
#endif
if (ssl_cainfo != NULL)
curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
curl_low_speed_limit);
curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
curl_low_speed_time);
}
curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
if (getenv("GIT_CURL_VERBOSE"))
curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
if (curl_ftp_no_epsv)
curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
if (curl_http_proxy)
curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
return result;
}
void http_init(struct remote *remote)
{
char *low_speed_limit;
char *low_speed_time;
curl_global_init(CURL_GLOBAL_ALL);
if (remote && remote->http_proxy)
curl_http_proxy = xstrdup(remote->http_proxy);
pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
#ifdef USE_CURL_MULTI
{
char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
if (http_max_requests != NULL)
max_requests = atoi(http_max_requests);
}
curlm = curl_multi_init();
if (curlm == NULL) {
fprintf(stderr, "Error creating curl multi handle.\n");
exit(1);
}
#endif
if (getenv("GIT_SSL_NO_VERIFY"))
curl_ssl_verify = 0;
ssl_cert = getenv("GIT_SSL_CERT");
#if LIBCURL_VERSION_NUM >= 0x070902
ssl_key = getenv("GIT_SSL_KEY");
#endif
#if LIBCURL_VERSION_NUM >= 0x070908
ssl_capath = getenv("GIT_SSL_CAPATH");
#endif
ssl_cainfo = getenv("GIT_SSL_CAINFO");
low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
if (low_speed_limit != NULL)
curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
if (low_speed_time != NULL)
curl_low_speed_time = strtol(low_speed_time, NULL, 10);
git_config(http_options, NULL);
if (curl_ssl_verify == -1)
curl_ssl_verify = 1;
#ifdef USE_CURL_MULTI
if (max_requests < 1)
max_requests = DEFAULT_MAX_REQUESTS;
#endif
if (getenv("GIT_CURL_FTP_NO_EPSV"))
curl_ftp_no_epsv = 1;
#ifndef NO_CURL_EASY_DUPHANDLE
curl_default = get_curl_handle();
#endif
}
void http_cleanup(void)
{
struct active_request_slot *slot = active_queue_head;
while (slot != NULL) {
struct active_request_slot *next = slot->next;
if (slot->curl != NULL) {
#ifdef USE_CURL_MULTI
curl_multi_remove_handle(curlm, slot->curl);
#endif
curl_easy_cleanup(slot->curl);
}
free(slot);
slot = next;
}
active_queue_head = NULL;
#ifndef NO_CURL_EASY_DUPHANDLE
curl_easy_cleanup(curl_default);
#endif
#ifdef USE_CURL_MULTI
curl_multi_cleanup(curlm);
#endif
curl_global_cleanup();
curl_slist_free_all(pragma_header);
pragma_header = NULL;
if (curl_http_proxy) {
free((void *)curl_http_proxy);
curl_http_proxy = NULL;
}
}
struct active_request_slot *get_active_slot(void)
{
struct active_request_slot *slot = active_queue_head;
struct active_request_slot *newslot;
#ifdef USE_CURL_MULTI
int num_transfers;
/* Wait for a slot to open up if the queue is full */
while (active_requests >= max_requests) {
curl_multi_perform(curlm, &num_transfers);
if (num_transfers < active_requests) {
process_curl_messages();
}
}
#endif
while (slot != NULL && slot->in_use) {
slot = slot->next;
}
if (slot == NULL) {
newslot = xmalloc(sizeof(*newslot));
newslot->curl = NULL;
newslot->in_use = 0;
newslot->next = NULL;
slot = active_queue_head;
if (slot == NULL) {
active_queue_head = newslot;
} else {
while (slot->next != NULL) {
slot = slot->next;
}
slot->next = newslot;
}
slot = newslot;
}
if (slot->curl == NULL) {
#ifdef NO_CURL_EASY_DUPHANDLE
slot->curl = get_curl_handle();
#else
slot->curl = curl_easy_duphandle(curl_default);
#endif
}
active_requests++;
slot->in_use = 1;
slot->local = NULL;
slot->results = NULL;
slot->finished = NULL;
slot->callback_data = NULL;
slot->callback_func = NULL;
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
return slot;
}
int start_active_slot(struct active_request_slot *slot)
{
#ifdef USE_CURL_MULTI
CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
int num_transfers;
if (curlm_result != CURLM_OK &&
curlm_result != CURLM_CALL_MULTI_PERFORM) {
active_requests--;
slot->in_use = 0;
return 0;
}
/*
* We know there must be something to do, since we just added
* something.
*/
curl_multi_perform(curlm, &num_transfers);
#endif
return 1;
}
#ifdef USE_CURL_MULTI
struct fill_chain {
void *data;
int (*fill)(void *);
struct fill_chain *next;
};
static struct fill_chain *fill_cfg = NULL;
void add_fill_function(void *data, int (*fill)(void *))
{
struct fill_chain *new = xmalloc(sizeof(*new));
struct fill_chain **linkp = &fill_cfg;
new->data = data;
new->fill = fill;
new->next = NULL;
while (*linkp)
linkp = &(*linkp)->next;
*linkp = new;
}
void fill_active_slots(void)
{
struct active_request_slot *slot = active_queue_head;
while (active_requests < max_requests) {
struct fill_chain *fill;
for (fill = fill_cfg; fill; fill = fill->next)
if (fill->fill(fill->data))
break;
if (!fill)
break;
}
while (slot != NULL) {
if (!slot->in_use && slot->curl != NULL) {
curl_easy_cleanup(slot->curl);
slot->curl = NULL;
}
slot = slot->next;
}
}
void step_active_slots(void)
{
int num_transfers;
CURLMcode curlm_result;
do {
curlm_result = curl_multi_perform(curlm, &num_transfers);
} while (curlm_result == CURLM_CALL_MULTI_PERFORM);
if (num_transfers < active_requests) {
process_curl_messages();
fill_active_slots();
}
}
#endif
void run_active_slot(struct active_request_slot *slot)
{
#ifdef USE_CURL_MULTI
long last_pos = 0;
long current_pos;
fd_set readfds;
fd_set writefds;
fd_set excfds;
int max_fd;
struct timeval select_timeout;
int finished = 0;
slot->finished = &finished;
while (!finished) {
data_received = 0;
step_active_slots();
if (!data_received && slot->local != NULL) {
current_pos = ftell(slot->local);
if (current_pos > last_pos)
data_received++;
last_pos = current_pos;
}
if (slot->in_use && !data_received) {
max_fd = 0;
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_ZERO(&excfds);
select_timeout.tv_sec = 0;
select_timeout.tv_usec = 50000;
select(max_fd, &readfds, &writefds,
&excfds, &select_timeout);
}
}
#else
while (slot->in_use) {
slot->curl_result = curl_easy_perform(slot->curl);
finish_active_slot(slot);
}
#endif
}
static void closedown_active_slot(struct active_request_slot *slot)
{
active_requests--;
slot->in_use = 0;
}
void release_active_slot(struct active_request_slot *slot)
{
closedown_active_slot(slot);
if (slot->curl) {
#ifdef USE_CURL_MULTI
curl_multi_remove_handle(curlm, slot->curl);
#endif
curl_easy_cleanup(slot->curl);
slot->curl = NULL;
}
#ifdef USE_CURL_MULTI
fill_active_slots();
#endif
}
static void finish_active_slot(struct active_request_slot *slot)
{
closedown_active_slot(slot);
curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
if (slot->finished != NULL)
(*slot->finished) = 1;
/* Store slot results so they can be read after the slot is reused */
if (slot->results != NULL) {
slot->results->curl_result = slot->curl_result;
slot->results->http_code = slot->http_code;
}
/* Run callback if appropriate */
if (slot->callback_func != NULL) {
slot->callback_func(slot->callback_data);
}
}
void finish_all_active_slots(void)
{
struct active_request_slot *slot = active_queue_head;
while (slot != NULL)
if (slot->in_use) {
run_active_slot(slot);
slot = active_queue_head;
} else {
slot = slot->next;
}
}
static inline int needs_quote(int ch)
{
if (((ch >= 'A') && (ch <= 'Z'))
|| ((ch >= 'a') && (ch <= 'z'))
|| ((ch >= '0') && (ch <= '9'))
|| (ch == '/')
|| (ch == '-')
|| (ch == '.'))
return 0;
return 1;
}
static inline int hex(int v)
{
if (v < 10) return '0' + v;
else return 'A' + v - 10;
}
static char *quote_ref_url(const char *base, const char *ref)
{
const char *cp;
char *dp, *qref;
int len, baselen, ch;
baselen = strlen(base);
len = baselen + 2; /* '/' after base and terminating NUL */
for (cp = ref; (ch = *cp) != 0; cp++, len++)
if (needs_quote(ch))
len += 2; /* extra two hex plus replacement % */
qref = xmalloc(len);
memcpy(qref, base, baselen);
dp = qref + baselen;
*(dp++) = '/';
for (cp = ref; (ch = *cp) != 0; cp++) {
if (needs_quote(ch)) {
*dp++ = '%';
*dp++ = hex((ch >> 4) & 0xF);
*dp++ = hex(ch & 0xF);
}
else
*dp++ = ch;
}
*dp = 0;
return qref;
}
int http_fetch_ref(const char *base, struct ref *ref)
{
char *url;
struct strbuf buffer = STRBUF_INIT;
struct active_request_slot *slot;
struct slot_results results;
int ret;
url = quote_ref_url(base, ref->name);
slot = get_active_slot();
slot->results = &results;
curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
if (start_active_slot(slot)) {
run_active_slot(slot);
if (results.curl_result == CURLE_OK) {
strbuf_rtrim(&buffer);
if (buffer.len == 40)
ret = get_sha1_hex(buffer.buf, ref->old_sha1);
else if (!prefixcmp(buffer.buf, "ref: ")) {
ref->symref = xstrdup(buffer.buf + 5);
ret = 0;
} else
ret = 1;
} else {
ret = error("Couldn't get %s for %s\n%s",
url, ref->name, curl_errorstr);
}
} else {
ret = error("Unable to start request");
}
strbuf_release(&buffer);
free(url);
return ret;
}