From: "Philipp A. Hartmann" <p...@qo.cx>
This adds a generic implementation for credential helpers.
It provides a header file credential_helper.h containing
a simplified credential API and common helper functions.
The implementation in credential_helper.c already provides
a main() function and chooses the credential operation
from a function table:
struct credential_operation const credential_helper_ops[] =
{
{ "get", my_backend_get },
{ "store", my_backend_store },
{ "erase", my_backend_erase },
CREDENTIAL_OP_END
};
With this, a specific credential helper backend usually only
needs to implement these operation callbacks.
Signed-off-by: Philipp A. Hartmann <p...@qo.cx>
---
contrib/credential/helper/credential_helper.c | 149 +++++++++++++++++++++++++
contrib/credential/helper/credential_helper.h | 116 +++++++++++++++++++
2 files changed, 265 insertions(+)
create mode 100644 contrib/credential/helper/credential_helper.c
create mode 100644 contrib/credential/helper/credential_helper.h
diff --git a/contrib/credential/helper/credential_helper.c
b/contrib/credential/helper/credential_helper.c
new file mode 100644
index 0000000..e99c2ec
--- /dev/null
+++ b/contrib/credential/helper/credential_helper.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2012 Philipp A. Hartmann <p...@qo.cx>
+ *
+ * This file is licensed under the GPL v2, or a later version
+ * at the discretion of Linus.
+ *
+ * This credential struct and API is simplified from git's
+ * credential.{h,c} to be used within credential helper
+ * implementations.
+ */
+
+#include <credential_helper.h>
+
+void credential_init(struct credential *c)
+{
+ memset(c, 0, sizeof(*c));
+}
+
+void credential_clear(struct credential *c)
+{
+ free(c->protocol);
+ free(c->host);
+ free(c->path);
+ free(c->username);
+ free_password(c->password);
+
+ credential_init(c);
+}
+
+int credential_read(struct credential *c)
+{
+ char buf[1024];
+ ssize_t line_len = 0;
+ char *key = buf;
+ char *value;
+
+ while (fgets(buf, sizeof(buf), stdin))
+ {
+ line_len = strlen(buf);
+
+ if(buf[line_len-1]=='\n')
+ buf[--line_len]='\0';
+
+ if(!line_len)
+ break;
+
+ value = strchr(buf,'=');
+ if(!value) {
+ warning("invalid credential line: %s", key);
+ return -1;
+ }
+ *value++ = '\0';
+
+ if (!strcmp(key, "protocol")) {
+ free(c->protocol);
+ c->protocol = xstrdup(value);
+ } else if (!strcmp(key, "host")) {
+ free(c->host);
+ c->host = xstrdup(value);
+ value = strrchr(c->host,':');
+ if (value) {
+ *value++ = '\0';
+ c->port = atoi(value);
+ }
+ } else if (!strcmp(key, "path")) {
+ free(c->path);
+ c->path = xstrdup(value);
+ } else if (!strcmp(key, "username")) {
+ free(c->username);
+ c->username = xstrdup(value);
+ } else if (!strcmp(key, "password")) {
+ free_password(c->password);
+ c->password = xstrdup(value);
+ while (*value) *value++ = '\0';
+ }
+ /*
+ * Ignore other lines; we don't know what they mean, but
+ * this future-proofs us when later versions of git do
+ * learn new lines, and the helpers are updated to match.
+ */
+ }
+ return 0;
+}
+
+void credential_write_item(FILE *fp, const char *key, const char *value)
+{
+ if (!value)
+ return;
+ fprintf(fp, "%s=%s\n", key, value);
+}
+
+void credential_write(const struct credential *c)
+{
+ /* only write username/password, if set */
+ credential_write_item(stdout, "username", c->username);
+ credential_write_item(stdout, "password", c->password);
+}
+
+static void usage(const char *name)
+{
+ struct credential_operation const *try_op = credential_helper_ops;
+ const char *basename = strrchr(name,'/');
+
+ basename = (basename) ? basename + 1 : name;
+ fprintf(stderr, "Usage: %s <", basename);
+ while(try_op->name) {
+ fprintf(stderr,"%s",(try_op++)->name);
+ if(try_op->name)
+ fprintf(stderr,"%s","|");
+ }
+ fprintf(stderr,"%s",">\n");
+}
+
+/*
+ * generic main function for credential helpers
+ */
+int main(int argc, char *argv[])
+{
+ int ret = EXIT_SUCCESS;
+
+ struct credential_operation const *try_op = credential_helper_ops;
+ struct credential cred = CREDENTIAL_INIT;
+
+ if (!argv[1]) {
+ usage(argv[0]);
+ goto out;
+ }
+
+ /* lookup operation callback */
+ while(try_op->name && strcmp(argv[1], try_op->name))
+ try_op++;
+
+ /* unsupported operation given -- ignore silently */
+ if(!try_op->name || !try_op->op)
+ goto out;
+
+ ret = credential_read(&cred);
+ if(ret)
+ goto out;
+
+ /* perform credential operation */
+ ret = (*try_op->op)(&cred);
+
+ credential_write(&cred);
+
+out:
+ credential_clear(&cred);
+ return ret;
+}
diff --git a/contrib/credential/helper/credential_helper.h
b/contrib/credential/helper/credential_helper.h
new file mode 100644
index 0000000..8266078
--- /dev/null
+++ b/contrib/credential/helper/credential_helper.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2012 Philipp A. Hartmann <p...@qo.cx>
+ *
+ * This file is licensed under the GPL v2, or a later version
+ * at the discretion of Linus.
+ *
+ * This credential struct and API is simplified from git's
+ * credential.{h,c} to be used within credential helper
+ * implementations.
+ */
+#ifndef CREDENTIAL_HELPER_H_INCLUDED_
+#define CREDENTIAL_HELPER_H_INCLUDED_
+
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <errno.h>
+
+struct credential
+{
+ char *protocol;
+ char *host;
+ unsigned short port;
+ char *path;
+ char *username;
+ char *password;
+};
+
+#define CREDENTIAL_INIT \
+ { NULL,NULL,0,NULL,NULL,NULL }
+
+void credential_init(struct credential *c);
+void credential_clear(struct credential *c);
+int credential_read(struct credential *c);
+void credential_write(const struct credential *c);
+
+typedef int (*credential_op_cb)(struct credential*);
+
+struct credential_operation
+{
+ char *name;
+ credential_op_cb op;
+};
+
+#define CREDENTIAL_OP_END \
+ { NULL,NULL }
+
+/*
+ * Table with operation callbacks is defined in concrete
+ * credential helper implementation and contains entries
+ * like { "get", function_to_get_credential } terminated
+ * by CREDENTIAL_OP_END.
+ */
+extern struct credential_operation const credential_helper_ops[];
+
+/* ---------------- common helper functions ---------------- */
+
+static inline void free_password(char *password)
+{
+ char *c = password;
+ if (!password)
+ return;
+
+ while (*c) *c++ = '\0';
+ free(password);
+}
+
+static inline void warning(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ fprintf(stderr, "warning: ");
+ vfprintf(stderr, fmt, ap);
+ fprintf(stderr, "\n" );
+ va_end(ap);
+}
+
+static inline void error(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ fprintf(stderr, "error: ");
+ vfprintf(stderr, fmt, ap);
+ fprintf(stderr, "\n" );
+ va_end(ap);
+}
+
+static inline void die(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap,fmt);
+ error(fmt, ap);
+ va_end(ap);
+ exit(EXIT_FAILURE);
+}
+
+static inline void die_errno(int err)
+{
+ error("%s", strerror(err));
+ exit(EXIT_FAILURE);
+}
+
+static inline char *xstrdup(const char *str)
+{
+ char *ret = strdup(str);
+ if (!ret)
+ die_errno(errno);
+
+ return ret;
+}
+
+#endif /* CREDENTIAL_HELPER_H_INCLUDED_ */
--
1.7.10.4
--
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